Mentally estimate the sum by rounding each number to the first digit. 
A. 230
B. 240
C. 200
D. 232
Answer: B
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Find the divergence of the field F.F = -7x6i + 3xyj + 5xzk
A. -34 B. -42x5 + 3y + 5z C. -42x5 + 8x D. -42x5 + 8x - 34
Use the given information to find the exact value of the trigonometric expression.cos ? = - 
; 
< ? < ?
Find cos(2?).
A. - 
B. 
C. - 
D. 
Solve the problem.Use the formula R = log
, where the magnitude of an earthquake on the Richter scale is based on I, the measurement of a seismic wave, and I0, the measurement of a seismic wave of a level zero earthquake with the same epicenter. If an earthquake measured 5.3 on the Richter scale, what was the intensity of the earthquake? (Round to whole number.)
A. 19,953 B. 158,489 C. 199,526 D. 200
Use order of operations to simplify the expression.(1 - 3) - 13
A. 11 B. 17 C. -9 D. -15