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3 years ago

[URGENT]

Mathematics

1 answer:

Blizzard [7]3 years ago

5 0

When you write URGENT the Brainly cops think you may be taking a test.

y = ax² + c thru (-1,4) and (0,8)

Substituting in the coordinates of each point for x and y gives two equations:

4 = a (-1)² + c

8 = a (0²) + c = c

From the second one we see c=8. Substituting into the first one,

4= a + 8

a = 4-8 = -4

Answer: a=-4, c=8

Check:

f(x) = -4x² + 8

f(0) = 8, good

f(-1) = -4(1) + 8 = 4, good

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When constructing an inscribed circle, which point is the center of the circle?

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Answer:

D. The intersection of the angle bisectors.

Step-by-step explanation:

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3 years ago

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3 years ago

Complete The Square: (Z^2)-19z=66

Musya8 [376]

To solve the equation using complete square method we proceed:
z^2-19z=66
but
c=(-b/2a)^2
c=(-19/2)^2
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z^2-19z+361/4=66+361/4
factoring the LHS we get:
1/4(2z-19)^2=625/4

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8 0

3 years ago

The bells are adding a new room to their house. The room will be a cube with volume 8000ft3. They are going to put in hardwood

puteri [66]

Given:

Volume of a cubed room = 8000 cubic ft

Cost of floor hardwood = $10 per square foot

To find:

The total cost of floor hardwood.

Solution:

Let the each side of cubed room be x ft.

Volume of a cube is cube of its side.

Volume of a cubed room is 8000 cubic ft. So,

$x^3=8000$

Taking cube root on both sides.

$x=20$

So, length of each of room is 20 ft.

Area of base = length × breadth

So, area of base of room is

$20\times 20=400\text{ ft}^2$

It means, 400 sq ft hardwood is required for the floor.

Cost of floor hardwood is $10 per square foot. So, total cost of hardwood floor is

$400\times 10=4000$

The hardwood floors will cost $4000.

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3 years ago

The weights of five grapefruits are 7 47 ounces, 7.23 ounces, 6.46 ounces, 7.48 ounces, and 6.81 ounces. Using the

gulaghasi [49]

Answer:

The approximate total weight of the grapefruits, using the clustering estimation technique is B. 35 ounces.

Step-by-step explanation:

We notice that the weights of the grapefruits given are slightly down or above 7, then we will use 7 as our cluster for the estimation, as follows:

Weights

7.47 ⇒ 7

7.23 ⇒ 7

6.46 ⇒ 7

7.48 ⇒ 7

6.81 ⇒ 7

Now we can add up 7 + 7 + 7 + 7 + 7 for the weights of the grapefruits and the approximate total weight is B. 35 ounces.

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3 years ago

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