Solve the matrix equation for X.A = 
, B = 
, AX = B
A. 
B. 
C. 
D. 
Answer: B
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Frank's algebra grade is based on the average of four exams, which will count equally. His grades are 75, 80, 70 and 85. Find his average.
A. 72.5 B. 77.5 C. 82.5 D. 92.5 E. 87.5
Solve the equation for y.-3x - 3y = 5
A. y = 
, or y = 
B. y = 
, or y = 
C. y = 
, or y = 
D. y = 
, or y = 
Find the nth term and the indicated term of the arithmetic sequence {an} whose initial term, a, and common difference, d, are given.a1 = 0; d = 
an = ?; a23 = ?
A. an = 
(n - 1); a23 = 22
B. an = 
(n + 1); a23 = 60
C. an = 
n; a23 = 
D. an = 
(n - 1); a23 = 55
Determine the vertex, focus, and directrix of the parabola and sketch its graph.(y + 4)2 = -4(x - 3)
A. vertex: (-3, 4)
focus: (-4, 4)
directrix: x = -2
B. vertex: (-4, 3)
focus: (-5, 3)
directrix: x = -3
C. vertex: (3, -4)
focus: (2, -4)
directrix: x = 4
D. vertex: (3, -4)
focus: (4, -4)
directrix: x = 2