Find A, in isosceles ABC with base AC, A=3x+9 and C=5x-13

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

On a architect's drawing of a house, 1 inche representa 1.5

Use set builder notation to represent the following set: { -3, -2, -1, 0}