Solve the problem.Find n when a1 = 7, d = -7, and an = -147.
A. 23
B. 22
C. 16
D. 24
Answer: A
Mathematics
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Find the exact value of the expression.sin 260° cos 20° - cos 260° sin 20°
A. - 
B. - 
C. 
D. - 
Mathematics
Solve the system using the inverse of the coefficient matrix of the equivalent matrix equation. 3x - 8y - z = -1 x + 8y + 4z = 32 8x + y + z = 38
A. (-4, 1, 8) B. (4, 1, 5) C. (4, 5, 1) D. No solution
Mathematics
Graph the inequality.x2 + y2 ? 1
A. 
B. 
C. 
D. 
Mathematics
Find the indicated partial sum for the given sequence.s5, -15, -18, -21, -24, . . .
A. -105 B. -15 C. -30 D. -75
Mathematics