WHAT IS 4.38 * .013 PLEASE SOMEBODY HURRY AND ANSWER?

The system of equations graphed below has how many solutions?

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

Angles r and s are complementary. the measure of angle r is 31 degrees. which equation can be used to find angle s?