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3 years ago

What is formulae for circumference when given radius or diameter

2 answers:

6 0

The formula for circumference is C=2 $\pi$ r, where r is the radius. If given the diameter, divide by 2 to get the radius.

Romashka-Z-Leto [24]3 years ago

4 0

The formula of the circumference is πd(pi multiply by the diameter) or 2πr(pi multiply by 2 times the radius[which is the same as the diameter])

The formula for the area of a circle is
$\pi r ^{2}$

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Some investments in the stock market have earned 10% annually. At this rate , earnings can be found using the formua A=P(1.10)^n

Lerok [7]

<span>The earnings by a stock invested at r% for n years is obtained by the formular A = P(1 + r)^n; where P is the initial investment = 1,500; r is the interest rate = 10% and n is the numberof years of the investment. Here A = 1,500(1 + 0.1)^18 = 1,500(1.1)^18 = 8,339.88.Hope this helps. Let me know if you need additional help!</span>

8 0

4 years ago

Read 2 more answers

A rock is thrown down with a velocity of 20 feet per second from a hot air balloon that is 220 feet above the ground. How long w

kupik [55]

Answer:

It takes the rock approximately 4.96 seconds to reach the ground

Step-by-step explanation:

The given parameters of the rock thrown down from the hot air balloon are;

The (initial) downward velocity with which the rock was thrown down, u = 20 feet/second

The height of the balloon when the rock was thrown down, h = 220 feet

According to the kinetic equation of motion, we have;

h = u·t + (1/2)·g·t²

Where;

h = The height of the rock when it was thrown = 220 ft.

u = The initial velocity of the rock = 20 ft./s

g = The acceleration due to gravity acting on the rock = 9.81 m/s²

t = How long it takes the rock to reach the ground

Plugging in the values gives;

220 = 20·t + (1/2)×9.81×t²

4.905·t² + 20·t - 220 = 0

Therefore;

t = (-20 ± √(20² - 4×4.905×(-220)))/(2 × 4.905)

t ≈ 4.96, or t ≈ -9.04

Therefore, the time it takes the rock to reach the ground, t ≈ 4.96 seconds.

5 0

3 years ago

During the spring you do yard cleanup for households and you also paint houses you earn $8 an hour cleaning up and $12 an hour p

Andre45 [30]

Answer: you spent 250 hours during your cleanup.

you spent 150 hours painting

Step-by-step explanation:

Let x represent the number of hours that you spent during your cleanup.

Let y represent the number of hours that you spent painting.

you earn $8 an hour cleaning up and $12 an hour painting last summer and you earned $3800 . it means that

8x + 12y = 3800- - - - - - - - - -- 1

You worked a total of 400 hours. This means that

x + y = 400

Substituting x = 400 - y into equation 1, it becomes

8(400 - y) + 12y = 3800

3200 - 8y + 12y = 3800

- 8y + 12y = 3800 - 3200

4y = 600

y = 600/4 = 150 hours

Substituting y = 150 into x = 400 - y, it becomes

x = 400 - 150

x = 250 hours

5 0

3 years ago

The sum of the digits of a two-digit number is 13. The units digit is one more than twice the tens digit. Find the number, and..

SCORPION-xisa [38]

Answer:

1)49

2)231

Step-by-step explanation:

4+9=13

4*2=8

8+1=9

2+3+1=6

2+1=3

1*2=2

8 0

3 years ago

Read 2 more answers

Plssss i need help rn

wariber [46]

Answer:

Step-by-step explanation:

(x₁ , y₁) = (-1 , -2) & (x₂ , y₂) = (3 , 10)

$Slope =\frac{y_{2}-y_{1}}{x_{2}-x_{1}}$

$= \frac{10-[-2]}{3-[-1]}\\\\=\frac{10+2}{3+1}\\\\=\frac{12}{4}\\\\=4$

m = 4

y - y₁ = m (x - x₁)

y - [-2] = 4(x - [-1])

y + 2 = 4(x + 1)

y + 2 = 4x + 4

y = 4x + 4 - 2

y = 4x + 2

8 0

3 years ago