Find a1, d, an, n, or Sn for the arithmetic sequence, as instructed.n = 6, a1 = -8, d = -2, an = -18; Find Sn.
A. -18
B. -78
C. -20
D. -48
Answer: B
Mathematics
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Convert.0.72 m = ___ km
A. 0.00072 B. 72 C. 0.0072 D. 720
Mathematics
Solve.-8x = 3
A. - 
B. - 
C. 
D. 
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Solve the system of equations by the elimination method.-4x - 5y = 5-12x - 15y = 15
A. no solution B. (-20, -25) C. (-25, -20) D. infinitely many solutions
Mathematics
If 
ABCD 
A'B'C'D' , CD = 24cm, C'D' = 8cm, and A'B' = 14cm, find AB.
What will be an ideal response?
Mathematics