Write out the sum. Do not evaluate.
A. 72 + 73 + 74 + ... + 7n+1
B. 72 + 73 + 74 + ... + 7n
C. 7 + 72 + 73 + ... + 7n+1
D. 7 + 72 + 73 + ... + 7n
Answer: A
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Solve the problem.Find the extreme values of 
subject to 
and 
A. Maximum: 
at 
minimum: - 
at 
B. Maximum: 
at 
minimum: - 
at 
C. Maximum: 
at 
minimum: - 
at 
D. Maximum: 
at 
minimum: - 
at 
Determine whether the variation between the indicated quantities is direct or inverse.The radius of a circle and its circumference
A. Inverse B. Direct
Use an inverse matrix to find the solution to the system.
A. x1 = 2, x2 = 2, x3 = -5, x4 = -6 B. x1 = 1, x2 = 4, x3 = 0, x4 = 1 C. no solution D. x1 = 1, x2 = 3, x3 = 6, x4 = -3
In each group of four products, one is wrong. Use estimation to determine which product is incorrect.
A. 207 × 60 = 12,420 B. 226 × 73 = 16,498 C. 37 × 314 = 11,618 D. 174 × 84 = 15,046