Solve.If the density of a substance is 6.71 × 10-6 tons per cubic foot, what would be the mass of 8.81 × 10-8 cubic feet of this substance. (Use the formula D = 
and round to the nearest hundredth, if necessary.)
A. 5.91 × 10-12 tons
B. 0.59 × 10-13 tons
C. 5.91 × 10-13 tons
D. 5.91 × 10-14 tons
Answer: C
Mathematics
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Construct a truth table for the statement.(q ? ~r) ? (q ? ~r)
A. 
| T | T | T |
F T F
F F F
B.
| T | T | T |
F T F
F F T
C.
| T | T | F |
F F F
F T T
D.
| T | T | F |
F T T
F F T
Mathematics
Solve the problem.The number of dislocated electric impulses per cubic inch in a transformer increases when lightning strikes by D = 4300(2)x, where x is the time in milliseconds of the lightning strike. Find the number of dislocated impulses at x = 0 and x = 5.
A. 4300, 17,200 B. 8600, 137,600 C. 4300, 137,600 D. 4300, 43,000
Mathematics
Find the indicated sum.Find the sum of the first 40 terms of the arithmetic sequence: -13, -4, 5, 14, . . .
A. 347 B. 6680 C. 6510 D. 6500
Mathematics
Solve and write interval notation for the solution set.
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A. 
B. 
C. 
D. 
Mathematics