Luis worjed 3hours less than 4times the number of hours Carlos worked. Which algebraic expression represents the number of hours that Luis worked? Use h to represent the number of hours Carlos worked.

Find the perimeter of the triangle with vertices  d(3, 4),  e(8, 7), and  f(5, 9). do not round before calculating the perimeter. after calculating the perimeter, round your answer to the nearest tenth.  

Factor the polynomial expression x6 – x3 – 20

The triangles are similar. what is the value of x? enter your answer in the box.