4. about 30% of the u. s. population is under 20 years old. about 17% of the population is over 60, which of the following is the probability that a person chosen at random is under 20 or over 60?

-17%
-53%
-47%
-30%

The tiles below are pieces of a normal ecg tracing representing a little less than two heartbeats at a resting rate of 80 bpm. arrange the tiles in their correct order. rank from first to last. do not overlap any tiles.

The pyramid shown has a square base that is 24 centimeters on each side. the slant height is 16 centimeters. what is the lateral surface area?

Maria solved an equation as shown below. what is the solution to maria’s equation?