ACT/SAT Math Practice #10

If the area of a circle is 16 square meters, what is its radius in meters?

In the figure, the circle with center O is inscribed inside square ABCD. If a side of the square measures 8 units, what is the area of the shaded region?

In the figure, right triangles ABC and ACD are drawn as shown. If AB = 20 and BC = 15 and AC = 7 then CD = ?

A circle with center O has a radius r. What is the area of a circle with a radius three times larger?

At a restaurant, diners enjoy an "early bird" discount of 10% off their bills. If a diner orders a meal regularly priced at $18 and leaves a tip of 15% of the discounted meal (no tax), how much does he pay in total?

When 15% of 40 is added to 5% of 260, the resulting number is:

An elementary school class just finished its annual fundraiser that it has been running for several years. The changes in the money earned from one year to the next for the fundraiser were a decrease of 10%, a 45% increase and a 20% decrease. What was the percent increase in the class's fundraising money over the last 3 years?