How can you decide which variable to solve for first when you are solving a linear system by substitution

Find the average rate of change for f(x) = x2 − 3x − 10 from x = −5 to x = 10.

If you answer right ill give brainliest, : )

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