In the formula V =  $I\cdot R$ , V is the voltage in an electric circuit with current  $I$   and resistance R.    Find V if  $I$ = 2.5 amperes and R = 60 ohms.

S=(n - 2)180 is the formula used to find the sum of the measures of the angles in a polygon with n sides. Find the sum if n = 8.

 $A\ =\ 6e^2$  is the formula used to find the surface area of a cube with edge e.  Find A if e = 12 cm.

 $L\ =\ \frac{s^2}{30}$  is the formula used to find the approximate length (L) of a skid in feet for a car traveling at s miles per hour.  Find L if s = 60 mph.

F = 1.8C + 32 if the formula used to convert a Fahrenheit temperature (F) to an equivalent Celsius temperature (C). Find F if C =  $20\degree.$  

 $B\ =\ \frac{4\left(220-y\right)}{5}$  is the recommended maximum heart rate during exercise for a person y years old.  Find B if y = 15.

 $V\ =\ \pi r^2h$  is the formula used to find the volume of a cylinder when the radius and the height are known.  Find the volume of a cylinder if r=3 and the h=4.  Leave your answer in terms of  $\pi.$  

 $M\ =\ \frac{a\ +\ b}{2}$  is the formula used to find the mean of two numbers, a and b.  Find the mean of the numbers 34 and 108.

 $V\ =\ \frac{4}{3}\pi\ r^3$  is the formula used to find the volume of a sphere when the radius is known.  Find the volume of a sphere with a radius of 18 in.  Leave your answer in terms of  $\pi.$