Tommy pays $550 dollars for a new cell phone plus $121-dollar monthly fee (1) for data. Write an expression for the total expense of his phone.

Aparallelogram has an area of 216.24 cm2 and a height of 15.9 cm. how long is the base of the parallelogram? enter your answer as a decimal in the box. cm

Tom drove 206 miles in 3.9 hours. estimate his average speed.

What are the solutions of the equation x4 + 6x2 + 5 = 0? use u substitution to solve.