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3 years ago

A circle has a radius of 10 cm what is the circumference

Mathematics

1 answer:

patriot [66]3 years ago

4 0

Answer:

62.8 cm

Step-by-step explanation:

The circumference of a circle can be found by

C = 2 * pi *r where r is the radius

C = 2*pi* 10

C = 20 pi

Letting pi be approximated by 3.14

C = 20 *3.14

C =62.8 cm

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If a toy rocket is launched vertically upward from ground level with an initial velocity of 120 feet per second, then its height

german

Answer:

$Time = 7.5\ seconds$

Step-by-step explanation:

Given

$Equation:\ h(t) = -16t^2 + 120t$

$Initial\ Velocity = 160ft/s$

Required:

Determine the time taken to return to the ground

From the equation given; height (h) is a function of time (t)

When the rocket returns to the ground level, h(t) = 0

Substitute 0 for h(t) in the given equation

$h(t) = -16t^2 + 120t$

becomes

$0 = -16t^2 + 120t$

Solve for t in the above equation

$-16t^2 + 120t = 0$

Factorize the above expression

$-4t(4t - 30) = 0$

Split the expression to 2

$-4t = 0\ or\ 4t - 30 = 0$

Solving the first expression

$-4t = 0$

Divide both sides by -4

$\frac{-4t}{-4} = \frac{0}{-4}$

$t = \frac{0}{-4}$

$t =0$

Solving the second expression

$4t - 30 = 0$

Add 30 to both sides

$4t - 30+30 = 0+30$

$4t = 30$

Divide both sides by 4

$\frac{4t}{4} = \frac{30}{4}$

$t = \frac{30}{4}$

$t = 7.5$

Hence, the values of t are:

$t =0$ and $t = 7.5$

$t =0$ shows the time before the launching the rocket

while

$t = 7.5$ shows the time after the rocket returns to the floor

5 0

2 years ago

Pls help me with this question

Sphinxa [80]

Answer:

its b

Step-by-step explanation:

it's b yup yup yeah yeah

5 0

2 years ago

A square pool is surrounded by a paved area that is 2 metres wide. If the area of the paving is 72m2, what is the length of the

likoan [24]

The length of the square pool is 8. 49cm

<h3>How to determine the area</h3>

Note that the formula for finding the area of a square is given as;

Area = length^2

We have

Area = 72 m²

Substitute into the formula

I^2 = 72

Find the square root of both sides

I= √72

I = 8. 49cm

The length of the square pool given as I is 8. 49cm

Thus, the length of the square pool is 8. 49cm

Learn more about area of a square here:

brainly.com/question/486778

#SPJ1

5 0

2 years ago

A baker uses 8.5 lbs of flour daily.How many ounces of flour will he use in two weeks?

kicyunya [14]

The answer would be 1,904 because a pound is 16 ounces so 8.5 times 14 (how many days are in two weeks) which is 119. Then 119 times 16 (how many ounces are in a pound) would be 1,904. hope i am helpful :D

7 0

2 years ago

For which equation is x = 5 a solution?

Setler [38]

Answer:

32−4x=12

Step-by-step explanation:To be honest I dont think I have a good explanation but I do know my answer is acurate.

7 0

3 years ago