Solve.Sand is poured carefully into a pile that forms a right circular cone as shown. The total surface area of the cone with slant height s and base radius r is given by the polynomial S = ?r2 + ?rs. Find an equivalent expression for S by factoring out a common factor.
A. S = ?r(?r + s)
B. S = ?r(r + s)
C. S = ?rs(r + 1)
D. S = r(?r2 + ?s)
Answer: B
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Solve.Martha can rake the leaves in her yard in 4 hours. Her younger brother can do the job in 5 hours. How long will it take them to do the job if they work together?
A. 20 hr
B. 
hr
C. 5 hr
D. 
hr
Perform the indicated operation.-11 ? (-19)
A. 220 B. 209 C. -220 D. 228
Solve the inequality graphically, numerically, or symbolically, and express the solution in interval notation. Where appropriate, round to the nearest tenth.
? 4
A. [-2.1, 0] B. (-?, 0) ? (-2.1, ?) C. (-?, -2.1) ? (0, ?) D. (-2.1, 0)
Write the first four terms of the geometric sequence with the given first term, a1, and common ratio, r.a1 = -3, r = -7
A. -3, 21, -63, 189, . . . B. -3, 21, -147, 1029, . . . C. -3, 21, 63, 189, . . . D. -3, 21, 147, 1029, . . .