Simplify the expression.-8b + 3 + 6b + 3b - 8
A. b + 3
B. b - 5
C. b - 8
D. b + 8
Answer: B
Mathematics
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Use a graphing calculator to find the vertex of the graph of the function.f(x) = x2 + x + 3
A. (-0.5, 3) B. (-0.5, 2.75) C. (0.5, 2.75) D. (0.5, -2.75)
Mathematics
Find the amount of sales.The commission rate is 
% and the commission is $1205.23.
A. $18,042 B. $92,710 C. $18,542 D. $6675
Mathematics
Find the exact value of the expression if ? = 30°. Do not use a calculator.f(?) = cos ?Find 
.
A. 
B. 
C. 5
D. 20
Mathematics
A matrix, A, corresponding to a system of linear equations and the matrix rref(A) obtained after the Gauss-Jordan elimination method is applied to A, are given. Write the system of linear equations corresponding to A, and use rref(A) to give all solutions of the system of linear equations. A = 
; rref(A) = 
A.
z = any value, y = 1 + 2z, x = 7 - 5z
B.
z = any value, y = 1 + 2z, x = 7 - 5z
C.
z = any value, y = -2, x = 5
D.
z = any value, y = 1 - 2z, x = 7 + 5z
Mathematics