Use the given vectors to find the value of the indicated scalar.u = 4i + 6j and v = -15i - 7j; Find u ? v.
A. -18
B. -102
C. -42
D. -60
Answer: B
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Solve the problem.A flagpole is perpendicular to the horizontal but is on a slope that rises 10° from the horizontal. The pole casts a 43-foot shadow down the slope and angle of elevation of the sun measured from the slope is 36°. How tall is the pole? Round your answer to the nearest 0.1 foot.
A. 36.2 ft B. 35.4 ft C. 36.4 ft D. 33.5 ft
Find the first year's depreciation using the MACRS method of depreciation and the MACRS depreciation rates table. Round to the nearest dollar.MACRS Depreciation Rates 
Cost: $402,500Period: 27.5-year
A. $1,402,713 B. $15,094 C. $14,027 D. $14,611
Rewrite the expression with a positive rational exponent. Simplify, if possible.(94/3)3/8
A. 9 B. 81 C. 3 D. 27
Find the slope and the y-intercept of the given line.y = -4x + 7
A. -4, (0, -7) B. 7, (0, -4) C. -7, (0, -4) D. -4, (0, 7)