Two coins are selected at random from 5 coins: 3 dimes and 2 quarters. What is the probability that
both are dimes?

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ab=4 and bc=3, find ah, ch and bh.

The chs baseball team was on the field and the batter popped the ball up. the equation b(t)=80t-16•16+3.5 represents the height of the ball above the ground in feet as a function of time in seconds. how long will the catcher have to get in position to catch the ball before it hits the ground? round to the nearest second

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class