Solve the system by the addition method.
A. {(15, -3)}
B. ?
C. {(x, y) 
D. {(-15, 5)}
Answer: A
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Without using a calculator, determine the system of inequalities needed for the calculator-generated graph.
A. x2 + y2 ? 16 x ? 0 B. x2 + y2 ? 16 x ? 0 C. x2 + y2 ? 16 x ? 0 D. x2 + y2 ? 16 y ? 0
Collect like terms.-4b + 8b
A. -4b B. 4b2 C. -12b D. 4b
Solve the equation. Use natural logarithms. When appropriate, give solutions to three decimal places unless otherwise indicated.ln e8x = 40
A. {5} B. {48} C. {320} D. {32}
Solve.While traveling in a car, the centrifugal force a passenger experiences as the car drives in a circle varies jointly as the mass of the passenger and the square of the speed of the car. If the a passenger experiences a force of 81 newtons when the car is moving at a speed of 30 kilometers per hour and the passenger has a mass of 100 kilograms, find the force a passenger experiences when the car is moving at 50 kilometers per hour and the passenger has a mass of 50 kilograms.
A. 125 newtons B. 112.5 newtons C. 150 newtons D. 100 newtons