when you have an equation the the result of multiple property's, can all the property's be in one equation?

At school there are 526 students and 263 are girls about how likely is it that a randomly chosen student will be a boy

Asimple random sample of size nequals14 is drawn from a population that is normally distributed. the sample mean is found to be x overbar equals 70 and the sample standard deviation is found to be sequals13. construct a 90% confidence interval about the population mean

Solve the equation -9p - 17 =10 a -3 b. 16 c. 18 d -16