I need to know how to use a algebra calulater

Choose the correct slope of the line that passes through the points (1, -3) and (3, -5)

Thompson and thompson is a steel bolts manufacturing company. their current steel bolts have a mean diameter of 127 millimeters, and a variance of 36. if a random sample of 35 steel bolts is selected, what is the probability that the sample mean would differ from the population mean by greater than 0.5 millimeters? round your answer to four decimal places.

Write the expression 7x^3-28xy^2 as the product of 3 factors