Factor by grouping.28r2 + 21ry - 4xr - 3xy
A. (3r + 4y)(7r - x)
B. (4r + 3y)(7r - x)
C. (4r + 3y)(x - 7r)
D. (4r + 3y)(7x - r)
Answer: B
Mathematics
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Construct a truth table for the statement.~t ? (~t ? s)
A. 
| T | T | F |
F T T
F F F
B.
| T | T | T |
F T T
F F T
C.
| T | T | T |
F T T
F F F
D.
| T | T | T |
F T T
F F F
Mathematics
Solve the problem.The following figure shows the shape and dimensions of a small dam. Assuming the water level is at the top of the dam, find the total force on the face of the dam. 
A. 60,505,200 N B. 40,336,800 N C. 75,631,500 N D. 2,160,900 N
Mathematics
Use the formula for Sn to find the sum of the first five terms of the geometric sequence.5, 20, 80, 320, . . .
A. 1715 B. 1701 C. 1705 D. 1707
Mathematics
Evaluate the definite integral by using the method of integration by parts.
?
?
A. ?
B. ?
C. ?
D. ?
E. ?
Mathematics