Solve this quadratic equation using the quadratic formula.
2x^2 - 10x + 7 = 02x2 - 10x + 7 = 0

Answers

Answer 1

Answer:

I'm assuming the equation is:

2x^2 -10x +7 = 0

x = (-b +- sqr root (b^2 - 4ac)) / 2a

x = (--10 +-sqr root (100 -4*2*7)) / 4

x = (10 +- sqr root (44)) / 4

x1 = (10 + 6.6332495807 ) /4

x1 = 16.6332495807 / 4

x1 = 4.1583123952

x2 =(10 - 6.6332495807 ) /4

x2 = 3.3667504193  / 4

x2 = 0.8416876048

Step-by-step explanation:


Related Questions

A car travels for 4(t+3) hours at a constant speed of 10(t+3) km/h. If the total distance travelled by the car is 810 km, find the speed of the car.

Answers

Step-by-step explanation:

[tex] \because \: time \times speed = distance \\ \therefore \: 4(t + 3) \times 10(t + 3) = 810 \\ \therefore \: 4(t + 3)^{2} = 81 \\ \therefore \: \{2(t + 3) \}^{2} = {9}^{2} \\ \therefore \: \{2(t + 3) \} = {9} \\ \therefore \: t + 3 = \frac{9}{2} \\ \therefore \: t = \frac{9}{2} - 3 \\ \therefore \: t = \frac{9 - 6}{2} \\ \therefore \: t = \frac{3}{2} \\ \therefore \: t = 1.5 \: hrs \\ [/tex]

[tex] \because \: time \times speed = distance \\ \therefore \: 4(t + 3) \times 10(t + 3) = 810 \\ \therefore \: 4(t + 3)^{2} = 81 \\ \therefore \: \{2(t + 3) \}^{2} = {9}^{2} \\ \therefore \: \{2(t + 3) \} = {9} \\ \therefore \: t + 3 = \frac{9}{2} \\ \therefore \: t = \frac{9}{2} - 3 \\ \therefore \: t = \frac{9 - 6}{2} \\ \therefore \: t = \frac{3}{2} \\ \therefore \: t = 1.5 \: hrs \\ speed \: of \: car = 10(t + 3) \\ \hspace{60 pt} = 10(1.5 + 3) \\ \hspace{60 pt}= 10 \times 4.5 \\ \red{ \boxed{ \bold{ \therefore \: speed \: of \: car = 45 \:km/ h}}} \\ [/tex]

A prism has a length of 6 units, height of 5 units, and width of 4 units. Which is the correct calculation for the volume of the prism?

Answers

Answer:

The answer is 120

Step-by-step explanation:

length X width X height

6*4*5

120

How should the decimal point in 34.05 be moved to determine the product 34.05 × 10 to the power of 6?


Enter your answers in the boxes to correctly complete this statement.


The decimal point should be moved __ places to the right because there are __ zeros in 10 to the power of 6

Answers

Answer:

The decimal point should be moved Six places to the right side because there are Six zeros in 10 to the power of 6.

Step-by-step explanation:

As we have to represent the number in the form of [tex]10^{6}[/tex] we need to move the decimal Six places towards left because there are Six zeros in [tex]10^{6}[/tex] i.e. 1000000. For this purpose we will add four zeros to the left of the number.

So the number in the format mentioned in question will look like -

0.00003405 × [tex]10^{6}[/tex].

Bob has 60 coins consisting of quarters and dimes. The coins combined value is $13.35. How many quarters and how many dimes does he have?

Answers

Bob has 49 quarters and 11 dimes.

What is Algebra?

A branch of mathematics known as algebra deals with symbols and the mathematical operations performed on them.

Variables are the name given to these symbols because they lack set values.

In order to determine the values, these symbols are also subjected to various addition, subtraction, multiplication, and division arithmetic operations.

Let there be x quarters.

Then there are 60 - x dimes so using cents as the unit, we get

25x + 10(60 - x) = 1335

25x + 600 - 10x = 1335

15x = 735

x= 49

and 60 - x = 60 - 49 = 11

Hence, Bob has 49 quarters and 11 dimes.

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Final answer:

By setting up a system of two equations, where q stands for the number of quarters and d for the number of dimes, and solving this linear system, we find that Bob has 49 quarters and 11 dimes.

Explanation:

To solve this problem, we can set it up as a system of equations. Let's call the number of quarters q and the number of dimes d. We have two pieces of information:

The total number of coins is 60: q + d = 60.The total value of the coins is $13.35. Since each quarter is worth $0.25 and each dime is worth $0.10, the value equation is: 0.25q + 0.10d = 13.35

Now, we can multiply the second equation by 10 to eliminate decimals:

2.5q + d = 133.5

Using the first equation (q + d = 60), we can express d as d = 60 - q. Substituting this into the second equation:

2.5q + (60 - q) = 133.5

Simplifying, we get:

1.5q = 73.5

Divide both sides by 1.5 to find q:

q = 49

Now, plug q back into the first equation to find d:

d = 60 - 49 = 11

So, Bob has 49 quarters and 11 dimes.

Describe the transformation.

Answers

Answer:

Reflection

Step-by-step explanation:

It is reflecting across the Y axis. It is not a dialation, since it is the same shape, but not a different size. Its not rotation, because it wasnt rotated to get to the new shape. And it is not translation, because it is not exactly the same shape (the shape was mirrored)

Which lengths could represent the side length of a right triangle?

Answers

Answer:

as long as

[tex]a^2+b^2=c^2[/tex]

then it’s valid, soo...

the first one is not valid (5,6,sqrt 223)

the second one is Not valid (7,11,sqrt 175)

the third one is correct, since [tex]6^2+15^2=261[/tex]

and [tex]\sqrt 261 = 16.1554944214[/tex] (further info)


What addition sentence does this show?

A. 5/7 + (- 5/7) = -10/7
B. -5/7 + (-5/7) = -10/7
C. 5/7 + (5/7) = -10/7
D. -5/7 + 5/7 = -10/7

Answers

B is the correct answer.
The correct answer is B

Write an equation to represent the relationship between the step number, n, and the number of dots, y.

Answers

The equation that represents the relationship between step number and the number of dots is [tex]y=5^n[/tex].

Solution:

Let the number of dots be y.

Step number 0: Number of dots = 1

y = 1

Using exponential rule: [tex]a^0=1[/tex]

[tex]y=5^0[/tex]

Step number 1: Number of dots = 5

y = 5

[tex]y=5^1[/tex]

Step number 2: Number of dots = 25

y = 25

[tex]y=5^2[/tex]

Step number 3: Number of dots = 125

y = 125

[tex]y=5^3[/tex]

Note that in step number 0 the power is 0, 1st step power of 5 is 1, 2nd step power of 5 is 2 and the third step power of 5 is 3.

If the process goes on up to n steps, then power of 5 is n.

∴ Step number n:

[tex]y=5^n[/tex]

Number of dots = [tex]5^n[/tex].

Hence the equation that represents the relationship between step number and the number of dots is [tex]y=5^n[/tex].

Is the product of three negative numbers positive or negative?

Answers

Answer:

yup, its positive

two times cancels out, but then the third time made it negative again

From the picture below, what is the measure of GC?

Answers

The measure of arc GC is 90°

Solution:

Given data:

m∠CHD = 90°

Sum of the adjacent angles in a straight line = 180°

⇒ m∠GHC + m∠CHD = 180°

⇒ m∠GHC + 90° = 180°

Subtract 90° from both sides, we get

⇒ m∠GHC = 90°

The angle measure of the central angle is equal to the measure of the intercepted arc.

[tex]m\angle GHD = m (ar \ GC)[/tex]

90° = m(ar GC)

Switch the sides.

m(ar GC) = 90°

The measure of arc GC is 90°.

If angle bdc=23 and arc ef=34, determine arc abd using the appropriate theorems and postulates.

Answers

m(ar ABD) = 57°

Solution:

The given question have mistake. The correct question is wiiten below.

If angle BCD = 23° and arc EF = 34°, determine arc abd using the appropriate theorems and postulates.

Given data:

m∠BCD = 23° and m(ar EF) = 34°

By central angle theorem,

The measure of a central angle is equal to the measure of the intercepted arc.

m (ar EF) = m∠ECF

m∠ECF = 34°

By vertical angle theorem,

If two lines are intersecting, then vertically opposite angles are equal.

⇒ m∠ACB = m∠ECF

m∠ACB = 34°

m∠ACD = m∠ACB + m∠BCD

              = 34° + 23°

m∠ACD = 57°

By central angle theorem,

m(ar ABD) = m∠ACD

m(ar ABD) = 57°

Find the slope (-1,-9) and (5,6)

Answers

Answer:

m = 5/2

Step-by-step explanation:

Formula for slope: [tex]m =\frac{y_2-y_1}{x_2-x_1}[/tex]

-[tex]\frac{6-(-9)}{5-(-1)}=\frac{15}{6} =\frac{5}{2}[/tex]

Otis has $6.72, and he wants to buy some pencils that cost $1.12 each. How many pencils can he buy?

Answers

6.72 divide by 1.12. And answer is 6

Answer: 6 pencils

Step-by-step explanation:

You divide 6.72(amount of money he has) by 1.12(the price of each pencil). You get the answer 6 pencils.

In a normally distributed data set with a mean of 24 and a standard deviation of 4.2, what percentage of the data would be between 15.6 and 32.4 and why?

Answers

Answer:

About 95% of data lies between 15.6 and 32.4

Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 2.4

Standard Deviation, σ = 4.2

We are given that the distribution of SAT score is a bell shaped distribution that is a normal distribution.

Empirical Formula:

Almost all the data lies within three standard deviation from the mean for a normally distributed data.About 68% of data lies within one standard deviation from the mean.About 95% of data lies within two standard deviations of the mean.About 99.7% of data lies within three standard deviation of the mean.

We have to find the percentage of data lying between 15.6 and 32.4

[tex]15.6 = 24 - 2(4.2) = \mu - 2\sigma\\32.4 = 24 + 2(4.2) = \mu + 2\sigma[/tex]

Thus, we have to find the percentage of data lying within two standard deviations of the mean. By Empirical formula about 95% of data lies between 15.6 and 32.4

Find g o f if f(x) = 2x - 1 and g(x) = x + 2.

Answers

Answer:

  (g◦f)(x) = 2x +1

Step-by-step explanation:

(g◦f)(x) = g(f(x)) = g(2x -1) = (2x -1) +2

(g◦f)(x) = 2x +1

__

Substitute f(x) for the argument in the function g(x) and simplify.

A painting with dimensions 10 inches by 14 inches is placed in a picture frame (of constant width), increasing its area to 221 square inches. How many inches is the width of the picture frame?

Answers

Answer:

1.5 inches

Step-by-step explanation:

(10+2x)(14+2x) = 221

4x² + 48x - 81 = 0

4x² + 54x - 6x - 81 = 0

2x(2x + 27) - 3(2x + 27) = 0

(2x + 27)(2x - 3) = 0

x = -27/2, 3/2

x = 3/2 or 1½ or 1.5 inches

The width of the picture frame is [tex]\\ x_{2} &=1,5 \end{aligned}$[/tex].

Quadratic equation formula

Given:

A painting with dimensions 10 inches by 14 inches is placed in a picture frame (of constant width), increasing its area to 221 square inches.

From the above explanation, we get the equation

[tex]4 x^{2}+2 \cdot 10 x+2 \cdot 14 x+10 \cdot 14 &=221[/tex]

[tex]\\ 4 x^{2}+48 x+140 &=221[/tex]

By using the quadratic formula, we get

[tex]\\ 4 x^{2}+48 x-81 &=0[/tex]

Solve with the quadratic equation formula

For a quadratic equation of the form [tex]$a x^{2}+b x+c=0$[/tex] the solutions are

[tex]\\ x &=\frac{-b \pm \sqrt{b^{2}-4 a c}}{2 a}[/tex]

[tex]\\ x &=\frac{-48 \pm \sqrt{48^{2}-4 \cdot 48 \cdot(-81)}}{2 \cdot 4}[/tex]

[tex]\\ x &=\frac{-48 \pm \sqrt{3600}}{8}[/tex]

[tex]\\ {\left[x_{1}\right.} &=-13,5][/tex]

[tex]\\ x_{2} &=1,5 \end{aligned}$[/tex]

Therefore, the width of the picture frame is [tex]\\ x_{2} &=1,5 \end{aligned}$[/tex].

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Find the product.
(2x+3)(2x-3)
A. 4x2 - 9
B. 4x2 +9
C. 4x2 –5x+9
D. 4x2 - 5x-9

Answers

Answer:

A. 4x^2 - 9

Step-by-step explanation:

2x * 2x = 4x^2

2x * -3 = -6x

3 * 2x = 6x

-3 * 3 = -9

-6x + 6x  = 0, so we're left with 4x^2 - 9

Answer:

B. (2x − 3)(2x + 3)(4x2 + 9)

Step-by-step explanation:

I NEED HELP ASAP WITH THIS QUESTION.

Answers

Answer:

a.) equivilent to;     4 x 7x - 4 x 6         and         28x-24

b.) equivilent to;     8y + 13y          and            21y

Step-by-step explanation:

A.)

4(7x-6)     First you have to multiply everything in the parenthesis by 4 because of distribution

7x x 4 - 6 x 4                That is why it is equivilent to the  4 x 7x - 4 x 6  awnser

28x - 24                    That is the end result by simplifiying and show why it is equivient to 28x-24

B.)

8y+6y+7y                 Simplify the like terms

8y+13y                   6+7 is 13 so that is why it is eauals to 8y+13y

21y                       if you continue adding you see why it equals 21y

Translate this sentence into an equation.
33 is the product of Rick's age and 3
Use the variable r to represent Rick's age.

Answers

Answer:

r=11

Step-by-step explanation:

3x11=33

so therefore r=11





Solve for ∠X.
A) 82°
B) 87°
C) 90°
D) 96°

Answers

Answer: D. 96

Step-by-step explanation:

1/2 (82 + 110)

1/2 (192) = 96

96°

∠X = 1/2(82 + 110)

∠X = 96°

1. What operation is being used in the equation?
x + 15 = 22

Answers

Property of addition I think

The given equation is:
x + 15 = 22
To determine what operation is being used, we look at the equation and identify the mathematical symbols. The symbol "+" represents the addition operation. This indicates that the number 15 is being added to the variable x.
Therefore, the operation being used in the equation is addition.

25 POINTSSSS

What is the area of the figure
PLEASE MAKE SURE IT IS RIGHT

Answers

Answer:

square area is 100 in

triangle area is 12

so your full area of the figure would be 112 i believe

Step-by-step explanation:

Hope this helps have a wonderful day

Kite K L M N is shown. The lengths of sides L M and M N are congruent. The lengths of L K and K N are congruent. Angle K is 99 degrees and angle N is 106 degrees. What is the measure of LMN in kite KLMN? 49° 99° 106° 155°

Answers

Answer

[tex]\angle \ LMN=49\textdegree[/tex]

Step-by-step explanation:

The diagonals of kite KLMN meet at 90°

Since, LK and KN are congruent,[tex]\angle KLM[/tex] and[tex]\angle KNM[/tex] form a set of opposite congruent angles. Congruent angles are equal.

All interior angles of a kite add up to 180°, therefore:-

[tex]\angle LMN=360\textdegree - 2\times106\textdegree-99\textdegree\\=49\textdegree[/tex]

Answer:

∠LMN = 49°

Step-by-step explanation:

Given that

∠LKN = 99°

∠MNK = 106°.

Because, the lengths of LK and KN are congruent.

LK=KN because congruent lines are equal

Hence, ∠MNK=∠MLK = 106°

Adding all angles together, we have

∠MNK + ∠MLK + ∠LKN + ∠LMN = 360°

By substituton;

We have

106° + 106° + 99° + ∠LMN = 360°

311° + ∠LMN = 360°

Collect like terms

∠LMN = 360° - 311°

∠LMN = 49°

Simplify expression
8n+4-6n/2

Answers

Step-by-step explanation:

8n+4-6n/2

8n+4-3n

5n+4

Answer:

n+2

Step-by-step explanation:

to  simplify this expression 8n+4-6n/2

we have,

{8n-6n + 4}/2

{2n + 4}/2

to further simplify this expression {2n + 4}/2 , we are going to factorize 2 from the numerator ,

we have

=2(n +2)/2

the next step to simplify the 2(n +2)/2 further is to use the factorised 2 at the numerator to divide the 2 at the denominator so that we can have a simplified expression.

we have

=2(n +2)/2

=n+2

therefore  the simplified form of the expression 8n+4-6n/2 is n+2

What is the numerical expression for 1/4 of the sum of 18 and 6

Answers

Answer:

1(18 + 6)/4

Step-by-step explanation:

1(18 + 6)/4

PLEASE MARK ME AS BRAINLIEST!!!

Final answer:

The numerical expression for 1/4 of the sum of 18 and 6 is calculated by adding 18 and 6 to get 24, then multiplying by 1/4 to get 6.

Explanation:

The numerical expression for 1/4 of the sum of 18 and 6 is found by first adding 18 and 6 to get their sum, which is 24. Then, to find 1/4 of this sum, you multiply 24 by 1/4. The calculation step-by-step is as follows:

Add 18 and 6 to get the sum: 18 + 6 = 24.Multiply the sum by 1/4 to get 1/4 of the sum: 1/4 × 24 = 6.

Therefore, the numerical expression for 1/4 of the sum of 18 and 6 is 6.

solve for −4.2y+2.1>−2.52

Answers

Answer:

y < 1.1

Step-by-step explanation:

Step 1:  Subtract 2.1 from both sides

-4.2y + 2.1 - 2.1 > -2.52 - 2.1

-4.2y > -4.62

Step 2:  Divide both sides by -4.2

-4.2y / -4.2 > -4.62 / -4.2

Since you divided by a negative, that flips the sign.

y < 1.1

Answer:  y < 1.1

Answer: Y < 1.1

Step-by-step explanation: I took the quiz, i hope this helps! :)

Write the equation of this line in slope-intercept form

Answers

Answer:

y = - [tex]\frac{2}{5}[/tex] x + 4

Step-by-step explanation:

The equation of a line in slope- intercept form is

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

Calculate m using the slope formula

m = (y₂ - y₁ ) / (x₂ - x₁ )

with (x₁, y₁ ) = (0, 4) and (x₂, y₂ ) = (5, 2) ← 2 points on the line

m = [tex]\frac{2-4}{5-0}[/tex] = [tex]\frac{-2}{5}[/tex] = - [tex]\frac{2}{5}[/tex]

Note the line crosses the y- axis at (0, 4) ⇒ c = 4

y = - [tex]\frac{2}{5}[/tex] x + 4 ← equation of line

Answer:

y = -2/5 +4

Step-by-step explanation:

Create the equation

points are :

(0 , 4 ) and ( 5,2)

midpoint = (0 + 5 )/2  and ( 4 + 2 )/2

= (2.5 , 3 )

the gradient = (2 - 4 )/ ( 5 - 0)

= -2/5

now create the equation using both gradient and midpoint

Y - y1 = m (X - x1)

y-3 = -2/5 (x - 2.5)

y = -2/5 x +1 +3

y = -2/5 +4

A fire truck parks 16 feet away from a building. The fire truck extends its ladder 30 feet to the very top of the building. How tall is the building?

Answers

The height of the building is 25.38 feet

Explanation:

Let AB denotes the height of the building.

Let BC denotes the distance between the fire truck and the building.

Let AC denotes the length of the ladder.

Using the Pythagorean theorem, we have,

[tex]AC^2=AB^2+BC^2[/tex]

where AC = 30, BC = 16

Substituting the values, we have,

[tex]30^2=AB^2+16^2[/tex]

Simplifying the terms, we get,

[tex]900=AB^2+256[/tex]

Subtracting both sides by 256, we get,

[tex]644=AB^2[/tex]

Taking square root on both sides of the equation, we get,

[tex]\sqrt{644}=AB[/tex]

[tex]25.38=AB[/tex]

Thus, the height of the building is 25.38 feet

Answer:

Step-by-step explanation:

a fire truck parks 16ft away fromm a building. the truck extends its ladder 30 feet. how far up the building from the trucks roof does the ladder reach

Explain a scenario where using properties of tangent lines to solve problems could be used in real life.

Answers

Answer:If we are traveling in a car around a corner and we drive over something slippery on the road (like oil, ice, water or loose gravel) and our car starts to skid, it will continue in a direction tangent to the curve.

Step-by-step explanation:

Tangent lines are essential in real-life scenarios like physics for analyzing motion, such as object velocity and acceleration, enabling accurate predictions in various fields.

**Tangent lines** are crucial in various real-life scenarios. For instance, in **physics**, when analyzing the motion of an object along a curved path, the tangent line at a specific point helps determine the object's instantaneous velocity or acceleration. This is vital in understanding how objects move in the real world.

A practical example is when studying the trajectory of a ball thrown into the air. By using the **tangent line** at different points of its path, we can calculate the ball's velocity or acceleration at those instances, assisting in sports analytics, engineering designs, or even space exploration calculations.

Understanding **tangent lines** is essential in fields like **engineering** and **physics** as it allows for precise calculations and predictions based on the behavior of curved functions and their instantaneous rates of change.

What is the distance between the points (13, -17) and (-9, -17) in the coordinate plane?

Answers

Here will be your answer

Answer:

The answer is 22.

d=√(−9−13)2+(−17−(−17))^2

d=√(-22)^2+(0)^2

d=√484+0

d=√484

d=22

Step-by-step explanation:

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