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3 years ago

Find the radius of a circle with a circumference of 45 centimeters

Mathematics

1 answer:

Aleonysh [2.5K]3 years ago

7 0

Answer:

radius is 7.16

Step-by-step explanation:

The equation to find the radius of a circle is r=C/2 with C being the circumference, r being the radius

First, list known values

C=45
R=?

Second, plug into equation

r= 45/2 $\pi$

Third, Solve

r= 7.16
(Rounded to the hundredths)

I hope this helped and have a great day!

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If the if a cylinder is 7 in tall and has a volume of 63 Pi inches what is the area of the cross section it goes right down the

vitfil [10]

Answer: $9\pi \ in.^2$

Step-by-step explanation:

Given

The height of the cylinder is $h=7\ in.$

The volume of the cylinder is $V=63\pi \ in.^3$

The volume of the cylinder is the product of area and height

$\Rightarrow V=\pi r^2h\\$

Insert the values

$\Rightarrow 63\pi =A\times 7\\\\\Rightarrow A=\dfrac{63\pi}{7}\\\\\Rightarrow A=9\pi\ in.^2$

Thus, the area of the cross-section is $9\pi \ in.^2$

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2 years ago

The Rangers played 40 games. They won 18 more games then they lost. How many games did they win?

maxonik [38]

9514 1404 393

Answer:

Step-by-step explanation:

Let w represent the number of wins. Then the number of losses is w-18. The total number of games played is ...

wins + losses = 40

w + (w-18) = 40

2w = 58

w = 29

The Rangers won 29 games.

4 0

3 years ago

Can a cubic equation have 3 complex roots? 3 real roots? ...?

trasher [3.6K]

No, a cubic equation can not have three complex roots. This is because it turns twice and one end goes to positive infinity and one end goes to negative infinity. Thus, one of these MUST cross the x-axis at some point, meaning y = 0 and a real root exists.

Yes, a cubic equation can have three real roots if it cuts the x-axis three times.

7 0

3 years ago

Please help NO LINKS!!!

kenny6666 [7]

Answer:

Step-by-step explanation:

base = 7 units

height = 12 unit

Area of triangle = $\frac{1}{2}*base * height\\$