The altitude a(in feet) of a plane t minutes after liftoff is given by a=3400t+600. how many minutes after liftoff is the plane at an altitude of 21,000 feet?

The weights of players in a basketball league are distributed normally. the distance (d) of each player's weight (w) from the mean of 86 kilograms was computed as follows: d = |w - 86| if d is greater than 7 for approximately 5% of the players, what is the approximate standard deviation of the players' weights? a. 1.75 kilograms b. 3.5 kilograms c. 4.3 kilograms d. 7 kilograms

Varies inversely with x. if y=8.5 when x=-1 find x when y=-1

Jim had 3,067.48 in his checking account he wrote a check to pay for two airplane tickets. his account now has 1,845.24.