Multiply the conjugates. Assume all variables have nonnegative values.(2
+ 
)(2
- 
)
A. 4x2 - y2
B. 4x - 2
- y
C. 4x - y
D. 4x + y
Answer: C
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Provide an appropriate response.The first-quadrant region bounded by y = 
, the x-axis, and the y-axis is revolved about the y-axis to form a solid. Explain how you could use elementary geometry formulas to verify the volume of the solid.
What will be an ideal response?
Solve the system by the addition method.x2 + y2 = 25x2 - y2 = 25
A. {(0, 5), (0, -5)} B. {(5, 0)} C. {(5, 0), (-5, 0)} D. {(0, 5)}
Solve the system of equations using substitution.
A. x = 1, y = 4; x = 4, y = 19 or (1, 4), (4, 19) B. x = 2, y = -1; x = -2, y = -1 or (2, -1), (-2, -1) C. x = 2, y = -1; x = 1, y = 2; x = -1, y = 2; x = -2, y = -1 or (2, -1), (1, 2), (-1, 2), (-2, -1) D. x = 1, y = 2; x = -1, y = 2 or (1, 2), (-1, 2)
Solve the problem.A woman has $1.70 in dimes and nickels. She has 5 more dimes than nickels. How many nickels does she have?
A. 8 B. 3 C. 18 D. 13