Find the first term and the common difference of the arithmetic sequence described. Give a formula for the nth term of the sequence.4th term is 8; 6th term is 18
A. a = -2; d = 5; an = 5n - 7
B. a = 7; d = -5; an = 5n + 12
C. a = -7; d = 5; an = 5n - 12
D. a = -2; d = 5; an = -7n + 5
Answer: C
Mathematics
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Factor the sum of cubes.27a6 + b3a3
A. (3a2 + ba)(9a4 - 3ba3 + b2a2) B. a3(3 + ab)(9 - 3ab + b2a2) C. a3(3a - b)(9a2 + 3ab + b2) D. a3(3a + b)(9a2 - 3ab + b2)
Mathematics
The graph of a function f is given. On the same axes, sketch the graph of f-1. f
A.
f
B.
f
f-1
C.
f
D. f
f-1
Mathematics
Solve the system of linear equations. If the system has infinitely many solutions, describe the solution with an ordered triple in terms of variable z.5x + 2y + z =-112x - 3y - z=177x - y=12
A. no solution B. (-2, 0, -1) C. (1, -5, 0) D. (0, -6, 1)
Mathematics
Simplify. Assume all variables represent positive real numbers.
A. 
B. 
C. 
D. 
Mathematics