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grigory [225]
4 years ago
7

Atraeus is solving the quadratic equation by completing the square. 7x2 – 14x + 6 = 0 7x2 – 14x = –6 A(x2 – 2x) = –6 What is the

value of A? –14 2 7 6
Mathematics
2 answers:
andrey2020 [161]4 years ago
7 0

Answer:

C

Step-by-step explanation:

Vedmedyk [2.9K]4 years ago
3 0
So we first minus 6 both sides
7x^2-14x=-6
then we have
A(x^2-2x)=-6
what is A?

hmm (this should be painfully obvous, but if not, here are steps)

7x^2-14x=-6
A(x^2-2x)=-6

7x^2-14x=-6=A(x^2-2x)
7x^2-14x=A(x^2-2x)
undistribute 7
7(x^2-2x)=A(x^2-2x)
divide both sides by (x^2-2x)
7=A

A=7
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Find the volume of a sphere with a circumference of 48 pi ft. Write your answer in terms of pi .
meriva

Answer:

18,432 pi cubic ft

Step-by-step explanation:

This problem can be solved using formula to find circumference and volume of sphere

for any sphere with radius r

circumference of sphere is 2* pi * r

volume of sphere is found by using formula 4/3*(pi*r^2)

Given circumference of sphere is 48 pi ft

therefore

2* pi * r = 48 pi ft

r = 48 pi ft/ 2* pi = 24 ft

substituting the value of r is formula of volume of sphere we have

volume of sphere is = 4/3*(pi*24^3) = 18,432 pi cubic ft

7 0
4 years ago
Simplify 4.5+ 3.1(2x + y) + 1.2y.
Mrac [35]

Answer:

see image

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
A pole that is 3.5m tall casts a shadow that is 1.47m long. At the same time, a nearby tower casts a shadow that is 42.75m long.
Stells [14]

<u>Answer:</u>

The height of the tower nearby the pole is 102 m.

<u>Solution:</u>

Given,

Height of the pole = 3.5 m

Length of the shadow of the pole = 1.47 m

Length of the shadow of the tower nearby = 42.75 m

Let us assume the height of the tower as x

\frac{height of the pole}{length of the shadow of the pole}=\frac{height of the tower}{length of the shadow of the tower}

\frac{3.5}{1.47} = \frac{x}{42.75}

On solving for x we get,

x = \frac{3.5}{1.47}\times 42.75

x = 101.785 m

On rounding off to the nearest meter we get,

x=102 m

\therefore The height of the tower is 102 meter.

7 0
3 years ago
You are running a concession stand at a basketball game. You are selling hotdogs and sodas. Each hotdog cost $1.50 and each soda
Lubov Fominskaja [6]

Answer:

35 hotdogs

Step-by-step explanation:

You are running a concession stand at a basketball game. You are selling hotdogs and sodas.

Let the number of hot dogs be represented by x

The number of soda be represented by y

You sold a total of 87 hotdogs and sodas combined

x + y = 87

x = 87 - y

Each hotdog cost $1.50 and each soda cost $0.50. At the end of the night you made a total of $78.50.

Hence we have the equation:

$1.50 × x + $0.50 × y = $78.50

1.50x + 0.50y = 78.50

Substitute 87 - y for x

1.50(87 - y) + 0.50y = 78.50

130.5 - 1.50y + 0.50y = 78.50

Collect like terms

- 1.50y + 0.50y = 78.50 - 130.50

-1.00y = -52

y = -52/-1

y = 52 sodas

How many hotdogs did you sell?

Using the equation:

x = 87 - y

x = 87 - 52

x = 35 hotdogs

Hence, you sold 35 hotdogs

6 0
3 years ago
Help me pls anyone it's math
liraira [26]

Answer:

C) 12(2v - 7)

Step-by-step explanation:

4 0
3 years ago
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