What is 21% of 90 estiamate

A fair coin is tossed two times in succession. The set of equally likely outcomes in {HH, HT, TH, TT}. Find the probability of getting exactly zero tails.

How can you solve for x in the proportion 7/8 = x/24? Set the sum of 7 and 8 equal to the sum of 24 and x, and then solve for x. Set the sum of 7 and 24 equal to the sum of 8 and x, and then solve for x.

A tank contains 8000 liters of water. each day, half of the water in the tank is removed. how much water will be in the tank at the end of: a. the 4th day? b. the 8th day?

Erica has six boxes of buttons. Each box holds 28 buttons. Explain how Erica can use place value and regrouping to find how many buttons there are.

A cylinder with a radius of 4 cm and a height of 6 cm is inside of a sphere with a radius of 10 cm. How much space is inside the sphere, but outside a cylinder? Round to the nearest tenth if necessary. Use 3.14 for pi.

The formula D=418t+6000 can be used to approximate the total average credit card debt in a U. S. household (in dollars) t years after 1995. Use this formula to predict what the total average credit card debt will be in the year 2025.

Are 8 (w+6) and 5+8w+1 equivalent expressions? Use substitution to check your answer.

How i can find 7 times 754 using two different methods

12. What is the length of the hypotenuse of the right triangle ABC in the figure? A. 7.2 B. 6.2 C. 11.0 D. 5.8

What is the probability of getting 3 tails when tossing a coin 4 times?