31. In a graduating high school class of 532, 15% of the students will receive As and 55% of the students will receive Bs. If 53 students receive Ds and no one failed, what approximate percentage
of the students received Cs?
a. 10%
b. 20%
C. 30%
d. 40%

How would I go step by step to figure it out?

Let f(x) = 5/x and g(x)=2x2+5x. what two numbers are not in the domain of f o g

What is the value of x enter your answer in the box (3x+50

The temperature of a chemical solution is originally 21 ? c . a chemist heats the solution at a constant rate, and the temperature of the solution 75 ? c after 1212 12 minutes of heating. the temperature, tt t , of the solution in ? c is a function of x , the heating time in minutes. write the function's formula.