An electrician's bank account on $7.50 and simple interest his account had an interest rate of 5% for the past 4 years what amount did he deposit 4 years ago

In triangle abc, the length of side ab is 12 cm, the length of side bc is 5 cm, and the length of side ca is 9 cm. find the measure of angle a using the law of cosines.

The water has been on the stove y=9.5x+62.1 after how many minutes will the tempature be 138.1 f

The lengths of all sides of a triangle are integers when measured in decimeters. one of the sides has length of 1 dm and another of 3 dm. find the perimeter of the triangle.'