The diagram shows you the radius of the circle is 1. It also tells you the value to use for π is 3. After you put these values in the formula, the rest is just arithmetic.
.. C = 2*π*r
.. C = 2*3*1
.. C = 6
An estimation of 3 out of every 25 men left handed is equivalent to

.

as a decimal is 0.12 (Divide the numerator by denominator (

) to get the decimal form of a given fraction. In this case,

⇒ 3 / 25 [Note: / = ÷] ⇒ 0.12) To turn a decimal into a percentage, multiply the decimal by 100 and add the percent sign %. 0.12 * 100 = 12. 12%
Your answer is 12%
It would actually depend on the way that you want your result. It can be in h, min, s
For example, in hours it would be 5.5h
in minutes, 330min
in seconds, 19800s
The inverse of the function given will be:
f(x)=(x-7)^(1/3)
to get the inverse we make x the subject
let f(x)=y=(x-7)^(1/3)
y=(x-7)^(1/3)
getting the cube of both sides we have:
y³=[(x-7)^(1/3)]³
y³=x-7
thus
x=y³+7
next we replace y by x and x with f^-1(x)
thus the inverse will be:
f^-1(x)=x³+7