Areal estate agent spends $79.95 each month for cell phone service. about how much money does the agent spend for 48 months

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.

The classrooms are trying to raise $1,200.00 for charity. mrs. leblanc's class has raised 50%. mr. patel's class has raised $235.14 ms. warner's class has raised 1/3 as much as mrs. leblanc's class. how much more money is needed to reach the goal of $1,200.00?

Can someone tell me if this is perpendicular? !