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olya-2409 [2.1K]

3 years ago

11

Please help, i need to raise my grade

1 answer:

Dmitrij [34]3 years ago

5 0

Answer:

$r=\dfrac{v^2}{a}$

Step-by-step explanation:

To isolate r, we're going to need to do some algebraic manipulation.

$a=\dfrac{v^2}{r}$

Multiply both sides by r:

$a\cdot r=v^2$

Divide both sides by a:

$r=\dfrac{v^2}{a}$

Hope this helps!

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A fence must be built to enclose a rectangular area of 20,000 ftsquared. fencing material costs $ 1 per foot for the two sides f

Simora [160]

The total cost of the least expensive fence would be $800.

To minimize perimeter and maximize area we take factors that are as close to equal as possible. In this case, the closest whole number factors are 200 and 100. Since the north and south faces cost less, we will make those 100 ft and make the more expensive east and west faces 200 ft.

100 ft × $2/ft = $200 per side × 2 sides = $400 for the north and south facing sides.

200 ft × $1/ft = $200 per side × 2 sides = $400 for the east and west facing sides

$400 + $400 = $800

6 0

3 years ago

Help me again please i needa get a 80 on this for it to be counted as a A

krok68 [10]

Answer:

- 28k - 3

Step-by-step explanation:

$- 3(8k + 1) \\multiply \: (8k + 1) \: by \: 3 \\ = - 28k - 3$

7 0

3 years ago

An item costs $430 before tax, and the sales tax is $12.90. Find the sales tax rate. Write your answer a a percentage

Temka [501]

Answer: The sales tax rate is 3%.

Step-by-step explanation: $12.90 is 3% of $430.

3 0

3 years ago

A 12-ft ladder leaning against a house makes a 64 degree angle with the ground. Will the ladder reach a window sill that is 10.5

Luba_88 [7]

Answer:

Yes, it will

Step-by-step explanation:

Given

Length of Ladder = 12 ft

Angle = 64

Required

Determine if it'll reach a height of 10.5ft from the base

See attachment for proper illustration.

<em>From the attachment, we want to determine that x be greater than 10.5</em>

Using sin formula:

$Sin\ 64 = \frac{x}{12}$

Multiply through by 12

$x = 12 * sin\ 64$

$x = 12 * 0.8988$

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<em>Since 10.79 is greater than 10.5, then the ladder will reach the window</em>

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5 0

3 years ago

Find the volume of a square pyramid with a base area of 18 in.² and a height of 6 in

Ludmilka [50]

ANSWER

36 cubic inches.

EXPLANATION

The volume of a square pyramid is calculated using the formula:

$V = \frac{1}{3} {l}^{2} \times h$

where l² is the area of the base and h= 6 inches is the height of the square pyramid.

We substitute the values into the formula to get,

$V = \frac{1}{3} \times 18 \times 6 \: {in}^{3}$

We simplify to get:

$V = 6 \times 6 =3 6 {in}^{3}$

Therefore the volume of the square pyramid is 36 cubic inches.

6 0

4 years ago