Mathematics High School

PLEASE HELP ASAP- solve the equation :
9x^2+64=0 . i need work to be shown for credit ....

Answers

Answer 1
In this quadratic equation a=9 b=0 c=64, you could use the Quadratic Formula:
x = [-b +-sqrt (b^2 -4*a*c)] / 2*a
x = 0 +- sqrt (0 -4*9*64) / 2*9
x = +- sqrt(-2,304) / 18

x = + 48 i / 18
x = -48 i /18

Where "i" is the square root of minus 1.


Related Questions

Which ordered pairs are on the line with the equation y+3.5=0.75(x-2)? I will mark brainliest. Thanks!

Answers

Hey! So all you have to do for this question is input the x- and y- values into the equation and simplify:
point 1: (1, 1.75)
y + 3.5 = 0.75 (x - 2)
(1.75) + 3.5 = 0.75 ((1) - 2)
5.25 = 0.75 (-1)
5.25 = -0.75  --> since these are not equation, (1, 1.75) is not correct.

Point 2: (-4, -8)
y + 3.5 = 0.75 (x - 2)
(-8) + 3.5 = 0.75 ((-4) - 2)
-4.5 = 0.75 (-6)
-4.5 = -4.5  --> this is correct because both sides are equal

Point 3: (7, 5.5)
y + 3.5 = 0.75(x - 2)
(5.5) + 3.5 = 0.75((7) - 2)
9 = 0.75(5)
9 = 3.75  --> not equal so not correct

Point 4: (4, -2)
y + 3.5 = 0.75(x - 2)
(-2) + 3.5 = 0.75(4 - 2)
1.5 = 0.75( 2)
1.5 = 1.5  --> equal so correct

So (-4, -8) and (4, -2) are your answers! Hope this helped :)       

come back and mark him brainliest

-lemons 2021

Twice a number minus a second number is -1. twice the second number added to three times the first number is 9. find the two numbers

Answers

let the first number be X
and the second be Y
so 2x-y= -1 ---------(1)
2y+3x=9 ______(2)
solve the simultaneous eqn
from eqn (1) y= 2x+1 _____(3)
sub eqn (3) into eqn(2)
2{2x+1} +3x=9
4x+2+3x=9
7x=9-2=7
x=1
sub x=1 into eqn (3)

y=2(1)+1 = 2+1 =3

the two numbers are 1 & 3

Solve this Multi-Step Equation

-3(t + 5) + (4t + 2) = 8

Answers

-3t-15+4t+2=8
-3t+4t=8+15-2
t=21
Im guessing you just want to know what t equals so, t=21

find three consecutive odd integers such that the square of the first plus the square of the third is 170

Answers

Here is the set up:

x
x + 2
x + 4

x^2 + (x + 2) + (x + 4)^2 = 170

Take it from here.

The bakers Healthy Bakery make 250 bagels in 10 hours. How many bagels can they bake in 12 hours? What was that rate per hour?

Answers

250/10 = 25 bagels per hour

25*12 = 300 bagels in 12 hours

Compare the two statements;
250 bagels=10 hours
Y=12 hours
I represented the unknown with Y. Cross and multiply. Y will multiply 10 to give 10Y and 12 will multiply 250 to give 3000. That will be;
10Y=3000
Divide both sides by 10. You will have;
Y=3000/10
Y=300
300 bagels will be made in 12 hours

To get the number of bagels per hour, divide the number of bagels by the number of hours. That will be;
300/12=25
OR
250/10=25
Hope that helped. Have a nice day

Calculat the length of the circumference of a circle with diameter of 8cm.
Use [tex] \pi [/tex] = 3

Answers

Hello there!

The formula for finding the circumference of a circle is 2[tex] \pi [/tex]r (or 2*3*r in your terms). Although we don't have the radius yet, we can certainly find it pretty easily. Keep in mind that the radius will always be half the diameter. So, let's find the radius.

8 / 2 = 4; now we have everything we need to solve for the circumference.

2*3*4 is our expression. Now let's simplify it.
2 * 3 = 6
6 * 4  = 24

Your circumference is 24cm.

I hope this helps!

i think its D but who knows HEEEEELELELLELEELEP

Answers

you plus 4 friends = 5 people

 them multiply 5 by m sp you get 5m

D is the correct answer


Y’all I am struggling. Help me out please I’ll give 15 points! #7

Answers

Since the angles in triangle ACM indicate that it is a 30-60-90 triangle, we know that the other two sides of triangle ACM are 20 and 10 (30-60-90 triangles have a very specific side coefficient). This means that the sides of this triangle have side lengths 40, 10, and [tex]20\sqrt{3}[/tex]. Adding these together you get 50+[tex]20\sqrt{3}[/tex]. Hope this helps!

A local hamburger shop sold a combined total of 445 hamburgers and cheeseburgers on Tuesday. There were 55 fewer cheeseburgers sold than hamburgers. How many hamburgers were sold on Tuesday?

Answers

Let x represent the number of hamburgers sold, and (x - 55) represent the number of cheeseburgers sold.

Set up an equation:
hamburgers + cheeseburgers = total number of burgers

x + (x-55) = 445

solve for x: 
2x - 55 = 445

2x = 445 + 55

2x = 500

x = 500÷2

x = 250

This means 250 hamburgers were sold on Tuesday.

Hope this helps!

-Jabba


To solve for the number of hamburgers sold, two equations were setup: H + C = 445 and C = H - 55. Substituting the second equation into the first and solving for H results in finding that 250 hamburgers were sold on Tuesday.

The question asks us to find out how many hamburgers were sold on Tuesday given that a total of 445 hamburgers and cheeseburgers were sold, and there were 55 fewer cheeseburgers than hamburgers. Let's denote the number of hamburgers as H and the number of cheeseburgers as C. We have two equations here: H + C = 445 and C = H - 55. Plugging in the second equation into the first, we get H + (H - 55) = 445, which simplifies to 2H - 55 = 445. Adding 55 to both sides gives us 2H = 500, and dividing both sides by 2 gives us H = 250. Therefore, on Tuesday, the hamburger shop sold 250 hamburgers.

Ana wants to paint her dogs doghouse. She has 4 colors: Green, Maroon, Blue and Wheat. One color will cover the walls, and another color will be used for the trim. (For example, green walls with wheat trim = GW.) Which one of these answers show all of the possible color combinations?

A. BW, BM, BG, BB, MW, MB, MG, MM, GW, GB, GM, GG
B. GM, GB, GW, MG, MB, MW, BG, BM, BW, WG, WM, WB
C. MM, MG, WB, WM, WG, BB, BG, BM, WB, GB, GM, GW

Answers

Let us take this one by one. One color can pair with three colors.

 

Green = Maroon, Blue, Wheat = GM, GB, GW

Maroon = Green, Blue, Wheat = MG, MB, MW

Blue = Green, Maroon, Wheat = BG, BM, BW

Wheat = Green, Maroon, Blue = WG, WM, WB

 

So the combinations are:

 

GM, GB, GW, MG, MB, MW, BG, BM, BW, WG, WM, WB

 

Which is letter B.

The awnser is b trust I got it right thank you for your time nd day

Where do the graphs of y = 3x and y= 3x + 4 intersect the y -axis and what is the relationship between the two lines?

Answers

y=3x should intersect the y-axis at 0,0 (technically it is y=3x+0) and for y=3x+4, (0,4) is where the equation intersects the y-axis. Because both these equations share the same slope, this means the two lines are parallel to each other. Hope this helps!
The equations y = 3x and y = 3x + 4 can not intersect because they have the same slope meaning they are both parallel lines.

Hope I helped :)

What is the area of a rectangle with vertices at ​ (−6, 3) ​, ​ (−3, 6) ​ , (1, 2) , and (−2, −1) ? Enter your answer in the box. Do not round any side lengths.

Answers

the answer is 258 only because of 1

Sharon writes this sentence:

Seven less than two times a number is 29.



Enter the equation that represents Sharon's sentence into the box.

Use x for the variable.

Answers

The answer is 2x-7=29

Answer:

your answer would be 2x-7+29



Suppose there are n students in a class what is the probability at least two students have same birthday

Answers

I don't have enough info to solve this
P(at least two have same birthday) =
1 - (1/2)^(n).

Since no specific number of students is given, we only get an expression.

What point is the image of (3,4) if it is reflected over the y axis?A. (-3,-4)B. (3,-4)C. (-3,4)D. (3,4)

Answers

point is the image of (3,4) if it is reflected over the y axis is (-3,4)
answer
C. (-3,4)

If point is the image of (3,4) if it is reflected over the y axis, then the resulting point is (-3,4) (option c)

When a point is reflected over the y-axis, its x-coordinate changes sign while the y-coordinate remains the same. In other words, if we have a point (x, y), its image after reflection over the y-axis will be (-x, y).

Let's apply this rule to the given point (3, 4). When we reflect it over the y-axis, the x-coordinate changes sign, but the y-coordinate remains the same. Therefore, the image of (3, 4) after reflection over the y-axis will be (-3, 4).

So, the correct Answer: C. (-3, 4)

To know more about reflection here

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Jose receives a $10 gift card for downloading music and wants to determine how many songs he can purchase. Each downloaded song costs $1.19. Write and solve an inequality to determine how many songs Jose can purchase. What does the solved inequality represent?

Answers

Final answer:

To determine the number of songs Jose can purchase using his gift card, the inequality 1.19x ≤ 10 is solved, resulting in x ≤ 8.4, meaning Jose can purchase a maximum of 8 songs.

Explanation:

Jose's gift card scenario:

Let's denote the number of songs he can purchase as x.

The inequality to represent this situation is: 1.19x ≤ 10 (the total cost of the songs cannot exceed the value of the gift card).

Solving for x, we get x ≤ 8.4. Since he can't purchase a fraction of a song, Jose can purchase a maximum of 8 songs using the gift card.

A store offers customers two ways to pay for a new TV. Option 11: Pay $1,500$1,500 today. Option 22: Pay nothing today, and take out a simple interest loan to pay a total of $1,650$1,650 one year from now. What is the simple interest rate on the loan in option 22?

Answers

Let's solve for the simple interest rate on the loan in option 2. We formulate an equation by enumerating the following: 
Option 1: If the customer pays today, the amount needed is only $1500. 
Option 2: If the customer pays after 12 months, the total amount is $1650. 
The equation is $1500+ ($1500x%charge) =$1650. Solve for % charge after 12 months, %charge = ($1650-$1500) /$1500 %charge =0. 1 or 10%

Therefore, the percent charge after 12 months is 10%.

The function graphed represents the amount of water in a container, in gallons, x minutes after a drain is opened.

What is the meaning of each key feature of the graph?

Drag the answer into the box to match each item.

Answers

The x-intercept: The number of minutes it takes for the container to empty
The y-intercept: The number of gallons in the container before the drain is open

Hope this helps!!

Let

x-------> the time in minutes

y-----> the function that represent the amount of water in gallons

Step 1

Find the x-intercept

we know that

The x-intercept is the value of x when the value of the function is equal to zero

In this problem (see the graph)

For [tex]y=0[/tex]

the value of x is [tex]15\ min[/tex]

so

the x-intercept is the point [tex](15,0)[/tex]

that means

The number of minutes it takes for the container to empty  is [tex]15\ min[/tex]

Step 2

Find the y-intercept

we know that

The y-intercept is the value of the function y when the value of x is equal to zero

In this problem (see the graph)

For [tex]x=0[/tex]

the value of the function y is [tex]120\ gal[/tex]

so

the y-intercept is the point [tex](0,120)[/tex]

that means

The number of gallons in the container before the drain is open is [tex]120\ gal[/tex]

therefore

the answer in the attached figure


A van travels 300 miles on 15 gallons of gas. Find how many gallons the van needs to travel 360 miles. 72 gallons of gas 18 gallons of gas 23 gallons of gas 67 gallons of gas

Answers

simple first we find the miles per gallon

so 300/15=20 therefor he would only need a extra 3 gallons to go 360 miles so your answer is

B.18

The equation of a line is −2x+5y=−20.

What is the x-intercept of the line?

Answers

to find the x intercept, sub in 0 for y and solve for x

-2x + 5y = -20
-2x + 5(0) = -20
-2x = -20
x = -20/-2
x = 10...so ur x int is 10 or (10,0) <==

The required solution of  the equation of a line is −2x+5y=−20 is x = 10.

What is equation?

An equation is a mathematical statement that is made up of two expressions connected by an equal sign. Equation, statement of equality between two expressions consisting of variables and/or numbers.

Given:

The given equation of a line is

−2x+5y=−20.

According to given question we have

BY the use of x- intercept put y=0 we get

-2x + 5y = -20

-2x + 5(0) = -20

-2x = -20

x = -20/-2

x = 10.

Therefore, the required solution of  the equation of a line is −2x+5y=−20 is x = 10.

Learn more details about equation  here:

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What is f(-3) if f(x) =|2x-1|-5

Answers

f(x) = |2x-1|-5

f(x) = |2*(x)-1|-5

f(-3) = |2*(-3)-1|-5 ... replace every x with -3

f(-3) = |-6-1|-5

f(-3) = |-7|-5

f(-3) = 7-5

f(-3) = 2 which is the final answer

Side Note: the vertical bars mean "absolute value" which represents distance. Negative distance makes no sense which is why absolute value results are never negative.

The value of a function is gotten from the input variable

The value of f(-3) is 2.

We have:

[tex]f(x) = |2x - 1| -5[/tex]

Substitute -3 for x

[tex]f(-3) = |2 \times -3 - 1| -5[/tex]

Multiply 2 and -3

[tex]f(-3) = |-6 - 1| -5[/tex]

[tex]f(-3) = |-7| -5[/tex]

Remove absolute bracket

[tex]f(-3) = 7 -5[/tex]

[tex]f(-3) = 2[/tex]

Hence, the value of f(-3) is 2.

See attachment for the graph of [tex]f(x) = |2x - 1| -5[/tex]

Read more about absolute functions at:

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A store sells small notebooks for ​$8 and large notebooks for ​$10. if a student buys 6 notebooks and spends ​$56​, how many of each size did he​ buy?

Answers

The first thing you have to do is find a way to make the last digit 6 (since its $56). So that would be $8×2=16, so there are 2 small notebooks. Then, she needs another $40 to get $56, so 40÷10=4, so she bought 4 large notebooks.

Answer: 2 small, 4 large
I would approach this from a Guess and Check Strategy. Take combinations of two numbers when added equal six: 0 + 6 1+ 5. 2+ 4, 3 + 3, 4 + 2, 5 + 1, 6 + 0. Take a combination like 3 + 3. If the student bought 3 notebooks at $8  each and 3 notebooks at $10 each it would be $24 + $30 = $54 which is just short of $56. You could use each of the combinations in the same way until you match $56. In the end the combination of 2 + 4 would solve the problem. Two notebooks at $8 each plus four notebooks at $10 each would be: $16 + $40 which does equal $56. So the student bought 2 notebooks at $8 each and 4 notebooks at $0 each.

Find the dimensions of the rectangle with largest area that can be inscribed in an equilateral triangle with sides of 1 unit, if one side of the rectangle is on the base of the equilateral triangle.

Answers

Maximum area = sqrt(3)/8 Let's first express the width of the triangle as a function of it's height. If you draw an equilateral triangle, then a rectangle using one of the triangles edges as the base, you'll see that there's 4 regions created. They are the rectangle, a smaller equilateral triangle above the rectangle, and 2 right triangles with one leg being the height of the rectangle and the other 2 angles being 30 and 60 degrees. Let's call the short leg of that triangle b. And that makes the width of the rectangle equal to 1 minus twice b. So we have w = 1 - 2b b = h/sqrt(3) So w = 1 - 2*h/sqrt(3) The area of the rectangle is A = hw A = h(1 - 2*h/sqrt(3)) A = h*1 - h*2*h/sqrt(3) A = h - 2h^2/sqrt(3) We now have a quadratic equation where A = -2/sqrt(3), b = 1, and c=0. We can solve the problem by using a bit of calculus and calculating the first derivative, then solving for 0. But since this is a simple quadratic, we could also take advantage that a parabola is symmetrical and that the maximum value will be the midpoint between it's roots. So let's use the quadratic formula and solve it that way. The 2 roots are 0, and 1.5/sqrt(3). The midpoint is (0 + 1.5/sqrt(3))/2 = 1.5/sqrt(3) / 2 = 0.75/sqrt(3) So the desired height is 0.75/sqrt(3). Now let's calculate the width: w = 1 - 2*h/sqrt(3) w = 1 - 2* 0.75/sqrt(3) /sqrt(3) w = 1 - 2* 0.75/3 w = 1 - 1.5/3 w = 1 - 0.5 w = 0.5 The area is A = hw A = 0.75/sqrt(3) * 0.5 A = 0.375/sqrt(3) Now as I said earlier, we could use the first derivative. Let's do that as well and see what happens. A = h - 2h^2/sqrt(3) A' = 1h^0 - 4h/sqrt(3) A' = 1 - 4h/sqrt(3) Now solve for 0. A' = 1 - 4h/sqrt(3) 0 = 1 - 4h/sqrt(3) 4h/sqrt(3) = 1 4h = sqrt(3) h = sqrt(3)/4 w = 1 - 2*(sqrt(3)/4)/sqrt(3) w = 1 - 2/4 w = 1 -1/2 w = 1/2 A = wh A = 1/2 * sqrt(3)/4 A = sqrt(3)/8 And the other method got us 0.375/sqrt(3). Are they the same? Let's see. 0.375/sqrt(3) Multiply top and bottom by sqrt(3) 0.375*sqrt(3)/3 Multiply top and bottom by 8 3*sqrt(3)/24 Divide top and bottom by 3 sqrt(3)/8 Yep, they're the same. And since sqrt(3)/8 looks so much nicer than 0.375/sqrt(3), let's use that as the answer.
The area of the rectangle is equal to L x W where L is the length and W is the width. 

               A = L x W

If we let L be the length and given that the triangle is equilateral with sides equal to 1, the value of W should be (0.5 - L/2)(tan 60)

           W = (0.5 - L/2)(tan 60)

Simplifying the expression for the width,
          W = 0.866 - 0.866L

The area now becomes,
      A = (L)(0.866 - 0.866L)

Simplifying,
    
   A = 0.866L - 0.866L²

Derive and equate to zero for the maximum value of L. 
   dA = 0.866 - 2(0.866)(L) = 0

The value of L from the equation should be 0.5. 
           W = 0.866 - 0.866(0.5) = 0.433

Answer: L = 0.5
             W = 0.433

Find the greatest common factor of 16, 27 and 20

Answers

Can you list the factors of each of those numbers (the numbers that divide evenly into them)? Of those three lists, what's the highest number present in all three?
The greatest common factor for 16, 27, and 20 is 1.
The factors for 16 are 1,2,4,8,16.
The factors for 27 are 1,3,9,27.
The factors for 20 are 1,2,4,5,10,20.

3x - 4y = 7 , for x

15y + 1 = x , for y

Answers

3x - 4y = 7 ; Solve for x

We're essentially just trying to get "x" onto it's own side.

So, in order to do this, we must get "y" onto the other side of our equal sign.

Add 4y to both sides.

3x = 4y + 7

Then, we divide 3 from both sides.

x = 4/3y + 7/3

15y + 1 = x ; Solve for y.

Instead of solving for x, we are now solving for y :)

So, in order to isolate y, we must subtract 1 from both sides.

15y = x - 1

Then, divide both sides by 15.

y = 1/15x - 1/15

~Hope I helped!~

I didn't get this one question right on a test. Could someone tell me what I did wrong? Plz and ty

Answers

8 - 5x <-2

8 (-8) - 5x < -2 (-8)

-5x < -10

-5x/-5 < -10/-5

x > 2            (flip the sign because you divided by a negative number

x = 3, 4, 5

your answer is 3, 4, 5

note that it isn't 2, because it isn't a ≥, which means that it cannot be 2

hope this helps


Macs farm has a total of 18 horses and 27 cows. what is the ratio of horses to cows in simplest form?

Answers

The ratio is basically finding the quotient of two numbers. If you want to find the ratio of horses to cows, divide the number of horses to that of cows.

Ratio = 18/27

When expressing it to its simplest form, make sure it is reduced. 18 and 27 are both factors of 9. So,

Ratio = 9*2/9*3
Cancelling out 9, the ratio at its simplest form is: 2/3

Answer:

2/3

Step-by-step explanation:

You know that you can ride your bike 8 miles in 20 minutes. At the same pace, how many miles would you go in 2 hours?

Answers

Hello there,
2 hrs= 160 minutes
20 minutes= 8 miles
160 minutes= ? miles
As you can see 20 x 8 = 160 miles 
So, you need to multiply 8 in both sides (meaning- 20 x 8 & 8 x 8)
160 minutes= 64 miles

Hope this helps

~Top 

In a zoo there are 17 more monkeys than lions and 30 more lizards than lions. If there were 151 monkeys, lions and lizards in total, how many of each kind are there?

Answers

If the amount of monkeys is m, lions is a, and lizards is b, then a+b+m=151, 17+a=m (since there are 17 more monkeys than lions), and 30+a=b. Substituting those values in (17+a=m and 30+a=b), we have 30+17+a+a+a=151=47+3a. Subtracting 47 from both sides, we get 104=3a. Next, we can divide both sides by 3 to get 104/3=a (the number of lions), 104/3+17=the number of monkeys, and 104/3+30=the number of lizards. Somehow we end up with a fraction (not a whole number), so there are 2/3rds of monkeys floating around using this logic.


The length of a quarter is 0.955 inch.Round the length of a quarter to the nearest tenth of an inch

Answers

0.955 rounded to the nearest tenth is 0.1

0.955 rounded to the nearest tenth would be 1.0


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