Perform the indicated operation.6 lb 3 oz × 7
A. 13 lb 5 oz
B. 43 lb 5 oz
C. 42 lb 3 oz
D. 42 lb 5 oz
Answer: B
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Find an antiderivative of the given function.2 cos 9x
A. sin 9x
B. 2 sin 9x
C. - 18 sin 9x
D. 
sin 9x
Write the augmented matrix for the system. 3x + 7z = 39 5y + 6z = 76 4x + 6y + 7z = 86
A. 
B. 
C. 
D. 
The number of bushels of corn per acre for a certain hybrid planted by farmers during the year was tabulated. The results are shown in a frequency distribution below. Find the mean number of bushels per acre. Please round your answer to the nearest integer. Yield (bu/acre)Frequency40 - 49 249 - 58 158 - 67 367 - 76 676 - 85 2785 - 94 4394 - 103 201103 - 112 197112 - 121 483121 - 130 332130 - 139 962139 - 148 481148 - 157 512157 - 166 193166 - 175 185175 - 184 92184 - 193 87193 - 202 53202 - 211 38
A. mean = 145 bu/acre B. mean = 133 bu/acre C. mean = 138 bu/acre D. mean = 144 bu/acre E. mean = 147 bu/acre
Solve the problem.When Maria finished medical school she owed $57,000 in student loans. She repaid 
of the total amount within two years of graduating. How much did she repay within two years of graduating?
A. $2850 B. $28,500 C. $31,350 D. $25,650