Acomputer uses the function f(h)= 50h + 75 to calculate the total repair bill, f(h), for h number of hours worked. find h if f(h)= $275

This is geometry. could anyone ? i can't fail this class. my grade is quite low already.

The birth weights of newborn babies in the unites states follow in a normal distrubution with a mean of 3.4 kg and standard deviation of 0.6 kg. reaserches interested in studying how. children gain weights decide to take random samples of 100 newborn babies and calculate the sample mean birth weights for each sample

What is the factor form of x^2-9x+14