Nancy had 143 dollars to spend on 6 books. After buying them she had 11 dollars. How much did each book cost? Let b = cost of each book

Can someone check my answer? you

If c(x) = 4x – 2 and d(x) = x2 + 5x, what is (cxd)(x)

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