A parking meter contains 51 coins. The total value of the coin is $8.40. If the meter contains only dimes and quarters, how many dimes are there?

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