PLZ HELP 20 points and brainliest
Select TWO equations that have infinitely many solutions.
A.
2(7 – 4x) = 4(5 – 2x) – 6
B.
6(x – 9) = 6x – 54 + x
C.
4(x + 4) = 2(2x + 5) + 6
D.
5(x – 8) + 10 = 5(x + 2)

Final answer:

An algebraic expression that represents 'x squared is less than 15' can be written directly as 'x² < 15', without additional mathematical operations.

Explanation:

The question asks for an algebraic expression that represents the inequality 'x squared is less than 15'. This is straightforward to write and does not require completing the square or solving a quadratic equation. The algebraic expression that correctly represents this inequality is simply x² < 15.

To explain further, the inequality suggests that the square of x (x²) must be less than the value 15. We do not need to perform any additional steps or manipulations like factoring or applying the quadratic formula, as the expression represents a basic inequality in its simplest form.

Answer:

Therefore ,the distance, on a coordinate plane, between the points G(2.-3) and D(2, 4) is [tex]GD = 7\ units[/tex]

Step-by-step explanation:

Given:

point G( x₁ , y₁) ≡ ( 2 ,-3)  

point D( x₂ , y₂) ≡ (2 , 4)  

To Find:

Distance between GD=?

Solution:

Distance Formula between two point is given by

[tex]l(GD) = \sqrt{((x_{2}-x_{1})^{2}+(y_{2}-y_{1})^{2} )}[/tex]

Substituting the values we get

[tex]l(GD) = \sqrt{((2-2)^{2}+(4-(-3))^{2} )}[/tex]

[tex]l(GD) = \sqrt{((0)^{2}+(4+3))^{2} )}=\sqrt{49}=7\\l(GD)=7\ units[/tex]

Therefore ,the distance, on a coordinate plane, between the points G(2.-3) and D(2, 4) is [tex]GD = 7\ units[/tex]

The area of forest after 5 years is 2846.93 square kilometer

Solution:

Given that, A certain forest covers an area of 4500 square kilometer

Suppose that each year this area decreases by 8.75%

To find: Area after 5 years

The decrease function is given as:

[tex]y = A(1-r)^t[/tex]

Where,

y is the value after t years

A = initial amount

r = decreasing rate in decimal

t is the number of years

Here in this sum,

A = 4500

t = 5 years

[tex]r = 8.75 \% = \frac{8.75}{100} = 0.0875[/tex]

Substituting the values in formula,

[tex]\begin{aligned}&y=4500(1-0.0875)^{5}\\\\&y=4500(0.9125)^{5}\\\\&y=4500 \times 0.632651\\\\&y=2846.93\end{aligned}[/tex]

Thus the area of forest after 5 years is 2846.93 square kilometer

Answer:

See below for the graph:

Step-by-step explanation:

The sale price of the coats is 160% of the purchase price of the coats.

Step-by-step explanation:

The owner buys the coats at a purchase price= $60

He sells the coats for a selling price= $96

Now, the question is:

The selling price $96 is what percentage of the purchase price $60

step 1: 96= x% of 60

step 2: 96= (x/100)*60

step 3: 96= 6x/10

step 4: 960/6 = x

step 5: x = 160%

Answer:

I believe the answer to this question is: X=square root(39), and square root(-39).

Answer:

It is angle k and angle l

Step-by-step explanation:

When opposite sides are given, especially for a right triangle, the longer the length the bigger the angle. The hypotenuse, which is across the right angle is always longest. The shortest side will always have the smallest angle. Check the image if it helps.

Answer:

The system of equations will have an infinite number of solutions.

Step-by-step explanation:

i) when we arrive at a solution of a linear system with two equations and two

 variables and the solution of the equation does not give the value of any

 variable but rather is in the form of an identity like the one given, that is

 -6 = -6, then we can say that the two equations are exactly the same and

  that the system of equations will have an infinite number of solutions.

Final answer:

The sum of the two numbers is 60 and their quotient is 4. Using the substitution method, we find that the two numbers are 48 and 12.

Explanation:

Let's call the two numbers x and y. We're given that the sum of the two numbers is 60, so we can write the equation:

x + y = 60

We're also given that their quotient is 4, so we can write the equation:

x / y = 4

To solve this system of equations, we can use the substitution method. Solving the second equation for x, we get:

x = 4y

Substituting this value of x into the first equation, we get:

4y + y = 60

Combining like terms, we have:

5y = 60

Dividing both sides by 5, we find:

y = 12

Substituting this value of y back into the equation x = 4y, we get:

x = 4(12)

Simplifying, we find:

x = 48

So the two numbers are 48 and 12.

=======================================

C(n, r) = (n!)/(r!*(n-r)!) is the combination formula

C(7, 5) = (7!)/(5!*(7-5)!)

C(7, 5) = (7!)/(5!*2!)

C(7, 5) = (7*6*5!)/(5!*2!)

C(7, 5) = (7*6)/(2!) ..... note the "5!" terms divided and canceled

C(7, 5) = (7*6)/(2*1)

C(7, 5) = 42/2

C(7, 5) = 21

Answer:

The vertex is the point (1,-8)

Step-by-step explanation:

we have

[tex]y=-4x^{2} +8x-12[/tex]

Convert to vertex form

step 1

Group terms that contain the same variable, and move the constant to the opposite side of the equation

[tex]y+12=-4x^{2} +8x[/tex]

step 2

Factor the leading coefficient

factor -4

[tex]y+12=-4(x^{2} -2x)[/tex]

step 2

Complete the square. Remember to balance the equation by adding the same constants to each side

[tex]y+12-4=-4(x^{2} -2x+1)[/tex]

[tex]y+8=-4(x^{2} -2x+1)[/tex]

step 3

Rewrite as perfect squares

[tex]y+8=-4(x-1)^{2}[/tex]

therefore

The vertex is the point (1,-8)

Answer:

[tex]AE=20\ units[/tex]

Step-by-step explanation:

we know that

If two triangles are similar, then the ratio of its corresponding sides is proportional and its corresponding angles are congruent

In this problem

Triangles AEB and DEC are similar by AA Similarity Theorem

so

[tex]\frac{AB}{DC}=\frac{AE}{DE}[/tex]

substitute the given values and solve for x

[tex]\frac{10}{4}=\frac{2x+10}{x+3}[/tex]

Multiply in cross

[tex]10x+30=8x+40\\10x-8x=40-30\\2x=10\\x=5[/tex]

Find the length side AE

[tex]AE=2x+10[/tex]

substitute the value of x

[tex]AE=2(5)+10=20\ units[/tex]

If we're talking about simple interest (and not compound interest), then

i = P*r*t

i = 5000*0.03*1

i = 150

----------

notes:

The interest earned in one year on $5,000 at an interest rate of 3% is $150. To find the interest earned on $5000 at 3% for one year, multiply the principal amount by the interest rate and time.

To calculate the interest earned with simple interest:

Interest = Principal x Rate x Time

Interest = $5000 x 0.03 x 1 year = $150

An exterior angle is equal to the sum of the two opposite inside angles.

T + 31 = t + t-29

Simplify:

T + 31 = 2t -29

Add 29 to both sides:

T + 60 = 2t

Subtract 1t from both sides:

T = 60

Answer:

answer is y=10x

Step-by-step explanation:

multiply time by 10 to equal models sara's direct variaton.

The equation models Sara's direct variation if, Sara's earnings vary directly with the number of hours she works, which is y = 10x, so option B is correct.

A collection of objects is arranged in a graph, where some object pairings are conceptually "linked." Each pair of connected vertices is referred to as an edge, and the objects are represented by mathematical abstractions known as vertices.

Given:

Sara's earnings vary directly with the number of hours she works,

x = number of hours worked, and y = earnings,

The equation for the above statement can be written as shown below,

earnings = number of hours worked  × salary

Assume the salary is a then,

y = ax

If she gets a salary of $10 then,

y = 10x

To know more about Graph:

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Answer: 4x + 76 = 688, $153 per ticket

Step-by-step explanation:

there are 4 tickets but you don't know the price of the tickets. Let x represent the price. Insurance costs $19. They got insurance ($19) on all 4 tickets (19 x 4) to get a insurance total of $76.

To get the price of one ticket we need to solve the equation.

4x + 76 = 688

subtract 76 from both sides.

4x = 612

divide by 4.

x = 153

each ticket costs $153

Final answer:

The price of one airline ticket, without insurance, is $153. This was found by setting up an equation for the total cost (4 tickets plus insurance for each at $19 per ticket) and solving for the price of one ticket.

Explanation:

To solve the problem, we first set up an equation to represent the total cost for the family's purchase of 4 airline tickets with travel insurance. We let x represent the price of one ticket, and since the travel insurance costs $19 per ticket, the cost of insurance for one ticket can be represented as 19 + x. There are 4 tickets, so the total cost of insurance for four tickets is $19 multiplied by 4 (which equals $76). Therefore, the equation for the total cost is:

Total Cost = 4x (price of tickets) + $76 (cost of insurance for all tickets)

According to the question, the total cost for the family is $688. So we can set up the equation:

4x + 76 = $688

To find the value of x, we subtract 76 from both sides of the equation:

4x = $688 - $76

4x = $612

Now divide both sides by 4 to solve for x:

x = $612 / 4

x = $153

Therefore, the price of one ticket is $153.

Answer:

what do you need?

Step-by-step explanation:

Answer:

4

Step-by-step explanation:

$ 2000 is invested at 3 % interest and $ 4000 is invested at 8 % interest

Solution:

Given that, total of $6000 was invested

Let "x" be the amount invested at 3 % interest

Then, (6000 - x) is the amount invested at 8 % interest

Given that,

The total yearly interest amounted to $380

Then, we can frame a equation as:

[tex]x \times 3 \% + (6000 - x) \times 8 \% = 380[/tex]

Solve the above expression for "x"

[tex]x \times \frac{3}{100} + (6000-x) \times \frac{8}{100} = 380\\\\0.03x + (6000-x) \times 0.08 = 380\\\\0.03x + 480 - 0.08x = 380\\\\-0.05x = -100\\\\\text{Divide both sides by -0.05 }\\\\x = 2000[/tex]

Thus, $ 2000 is invested at 3 % interest

(6000 - x) = 6000 - 2000 = 4000

$ 4000 is invested at 8 % interest

There are 10 kangaroos and 24 dingoes in this animal rescue.

Step-by-step explanation:

Given,

Total head count = 34 heads

∴ Kangaroos + Dingoes = 34

Let us assume,

Number of kangaroos as "x" and number of dingoes as "y"

The equation can be framed as x + y = 34

The number of feet for kangaroo = 2 feet

The number of feet for dingoes = 4 feet

The total number of feet = 116 feet

So, the equation can be framed as 2x + 4y = 116

Step 1 : Muliply the 1st equation by 2.

The new equation is 2x + 2y = 68

step 2 : Subtract the above equation with the second equation.

    2x + 2y = 68

  -2x - 4y = -116

          -2y = -48

step 3 : Therefore, y =24. Substitute y=24 in the 1st equation.

x + 24 = 34

x = 34-24

x = 10

Kangaroos, x = 10 kangaroos

Dingoes, y = 24 dingoes

Final answer:

To find the number of kangaroos and dingoes, we can use a system of equations to solve for their values. Given the number of feet and heads, we can form equations to represent these quantities. Solving these equations simultaneously yields the solution of 10 kangaroos and 24 dingoes.

Explanation:

To solve this problem, we can use a system of equations. Let's denote the number of kangaroos as 'k' and the number of dingoes as 'd'. We are given two pieces of information:

1. The total number of feet is 116, where each kangaroo has 2 feet and each dingo has 4 feet. So, the equation would be: 2k + 4d = 116.

2. The total number of heads is 34. Since each animal has only one head, the equation would be: k + d = 34.

We can solve these equations simultaneously to find the values of k and d. Multiplying the second equation by 2, we get: 2k + 2d = 68. Subtracting this equation from the first equation, we have: (2k + 4d) - (2k + 2d) = 116 - 68. Simplifying, we get: 2d = 48. Dividing both sides by 2, we find that d = 24.

Substituting this value back into the second equation, we can find k: k + 24 = 34, k = 10.

Therefore, there are 10 kangaroos and 24 dingoes at the animal rescue.

Answer:

2.40

Step-by-step explanation:

tangent of an angle= opposite side/ adjacent side

tan(T)= RS/ RT

tan(T)= 12/5

tan(T)= 2.40 (nearest hundredth)

Answer:

y = - 5x + 7

Step-by-step explanation:

The equation of a line in slope- intercept form is

y = mx + b ( m is the slope and b the y- intercept )

Here m = - 5 and b = 7, thus

y = - 5x + 7 ← equation of line

Good morning ☕️

Answer:

Step-by-step explanation:

y=mx+b

m = slope = -5

b = y-intercept = 7

then the equation is : y = -5x + 7

:)

Jeremy made 110 this week from mowings yards

This week, Jeremy made a total of $110 from mowing yards. This total was obtained by adding the amounts he earned from each yard: $25, $35, and $50.

To solve this problem, we will add together the amounts of money that Jeremy earned for each yard he mowed. This is because when we want to find out a total amount across several different items or events, we use addition.

First, Jeremy earned $25 for mowing the first yard. Then, he earned $35 for mowing the second yard. Finally, he mowed the largest yard and charged $50 for it.

Now we add these numbers together: $25 + $35 + $50 = $110.

So, Jeremy made a total of $110 mowing yards this week.

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Answer: c. 22X

Step-by-step explanation:

Answer:

22x

Step-by-step explanation:

7 + 1 5

or

7+15

22

Answer:

Mr Jackson should get $8.88 back.

Step-by-step explanation:

$50 - $41.12 = $8.88

The x-intercepts appear on this polynomial are 3 x intercepts.

Step-by-step explanation:

To find the x intercepts of the polynomial [tex]f(x)=x^{4} -5x^{2}[/tex] is by equating [tex]f(x)=0[/tex]

Thus, the equation becomes

[tex]\begin{array}{r}{x^{4}-5 x^{2}=0} \\{x^{2}\left(x^{2}-5\right)=0}\end{array}[/tex]

Equating, we get,

[tex]x^{2}=0,\left(x^{2}-5\right)=0[/tex]

[tex]x=0[/tex], [tex]\begin{aligned}x^{2}-5 &=0 \\x^{2} &=5 \\x &=\pm \sqrt{5}\end{aligned}[/tex]

Thus, the x-intercepts are [tex]x=0, x=\sqrt{5} , x=-\sqrt{5}[/tex]

Hence, the x-intercepts appear on this polynomial are 3 x intercepts.

Answer:

1 x-intercepts

Step-by-step explanation:

has same question on a test

Answer:

Step-by-step explanation:

8)Volume of cylinder = πr²h= π*3*3*10 =90π cubic inches

Volume of cone = 1/3πr²h = π*3*3*5/3= 15π cubic inches

Volume of rocket = 90π + 15π = 105π cubic inches

9) Matt made an error. radius = diameter/2 = 15/2= 7.5 cm.Instead using 7.5 in volume formula, he used diameter.

Answer:

0

Step-by-step explanation:

These are two lines with equal slopes and different y intercepts so they will be parallel and will never intersect