Right triangular pyramid

Solve - pv + 40 < 65 for v solve 7w - 3r = 15 for r

What is the approximate circumference of the circle shown below?

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?