Solve the system by elimination. x + 9y = -55 8x + 8y = 8
A. {(8, -7)}
B. {(-8, -6)}
C. {(7, -6)}
D. ?
Answer: A
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A cup of coffee with temperature 105°F is placed in a freezer with temperature 0°F. After 5 minutes, the temperature of the coffee is 69.3°F. What will its temperature be 20 minutes after it is placed in the freezer? Round your answer to the nearest degree.
A. 20°F B. 16°F C. 17°F D. 18°F
For what values of c does the curve have maximum and minimum points?
Select the correct answer.
Solve the system of equations using the addition method. x + 8y = 315x + 7y = 23
A. (-1, 4) B. (1, 5) C. (-2, 5) D. no solution
Find any excluded values.
A. 9, -7, 23 B. -9, -7 C. -9, -7, 23 D. 9, -7