Let a and b be positive numbers. Determine whether the statement is true or false.(-a)(-b) is a negative number.
A. True
B. False
Answer: B
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Use a finite sum to estimate the average value of the function on the given interval by partitioning the interval and evaluating the function at the midpoints of the subintervals.f(x) = 
on [3,7] divided into 4 subintervals (Round to the nearest hundredth.)
A. 0.32 B. 0.40 C. 8.89 D. 1.27
Determine whether the lines through each pair of points are perpendicular.(2, 0) and (6, -20); (6, 3) and (8, -7)
A. perpendicular B. not perpendicular
Solve.The water in a tank weighs 358.18 lb. One cubic foot of water weighs 62.5 lb. How many cubic feet of water are in the tank? (Round to the nearest hundredth.)
A. 420.68 cu. ft B. 22,386.25 cu. ft C. 5.73 cu. ft D. 0.17 cu. ft
Perform the conversion.120,000 mg = kg
A. 1.2 B. 0.012 C. 0.12 D. 12