Please help with my math!

Solve the equation 3x2 + 19x + 9 = 0 to the nearest tenth.

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

How many credit hours will a student have to take for the two tuition costs to be equal? round the answer to the nearest tenth of an hour.