How many times larger is 9 x 10^-8 than 3 x 10^-12?

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?

3.4a=57.8 what is the the value of a

In the diagram, ab is tangent to c, ab = 4 inches, and ad = 2 inches. find the radius of the circle.