As part of a study on the metabolism of athletes, 400 college basketball players are randomly chosen and their weights taken. The distribution of the weights is approximately normal. The average weight is 215 pounds and the standard deviation is 15 pounds.Approximately how many players had weights between 215 and 225 pounds?
A. 50
B. 25
C. 20
D. 100
E. none of these
Answer: D
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Solve the equation.2x - 17
- 9 = 0
A. 
B. {81}
C. {9}
D. 
Solve the problem.Instruments on a satellite measure the amount of power generated by the satellite's power supply. The time t and the power P can be modeled by the function P = 50e-t/300, where t is in days and P is in watts. How much power will be available after 378 days? Round to the nearest hundredth.
A. 15.95 watts B. 4.11 watts C. 14.18 watts D. 14.32 watts
Solve.xy - x2 = -20x - 2y = 3
A. (5, 1) and 
B. (-5, -1) and 
C. (-5, -1) and 
D. (5, 1) and 
Let x represent one number and let y represent the other number. Use the given conditions to write a system of nonlinear equations. Solve the system and find the numbers.The difference between the squares of two numbers is 75. Twice the square of the second number subtracted from the square of the first number is 
. Find the numbers.
A. 10 and 5, -10 and 5, 10 and -5, or -10 and -5 B. 10 and 5 or -10 and -5 C. 10 and 5, -10 and 5, or 10 and -5 D. 10 and 5