1. Evaluate the expression a + b for a = 8 and b = 7 2. Evaluate the expression xy for x = 4 and y = 9 3. Evaluate the expression 3x + y for x = 11 and y = 8.

The diameter of a ball is 8 in. what is the volume of the ball? use 3.14 for pi. enter your answer as a decimal in the box. round only your final answer to the nearest hundredth.

Which of the following is the shape of a cross section of the figure shown below

Which coefficient matrix represents a system of linear equations that has a unique solution ? options in photo*