k.)
(a) r + s (n - k)
(b) r + s (n + k)
(c) rs(n + k)
(d) kr + s(n - k)
(e) kr + ns
28. a rectangular solid has a square base and altitude
of 7. if the volume of the solid is 252, then the
perimeter of the square base is
(a) 9
(b) 24
(c) 28
(d) 36
(e) 49
29. in a series of races, 10 toy cars are raced, 2 cars at
a time. if each car must race each of the other cars
exactly twice, how many races must be held?
(a) 40
(b) 90
(c) 100
(d) 180
(e) 200
30. (2 - 2 )(2 - 2 ) =
(a) 2
(b) 2
(c) 2
(d) 2
(e) 2
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