Plesae urgent hurryy for brainlist

There are 12 boy and13 girls in a class. if the teacher randomly chooses a student’s name out of a hat what is the probability it will be a girl

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

Let f(x) = 3 − x . find the average rate of change of f(x) from x = a to x = a + h and simplify your answer so that no single factor of h is left in the denominator.