The given pattern continues. Write down the nth term of the sequence suggested by the pattern.2, 4, 8, 16, 32, ...
A. an = 2n
B. an = 2n-1 + 1
C. an = 2 + 2(n - 1)
D. an = 2n
Answer: D
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Find an equation of the line tangent to the given curve at the point (a, f(a)). f(x) = 2e7x , a = 0
A. y = -14x + 2 B. y = 2x + 2 C. y = 14x + 2 D. y = 7x + 2
Given a group of students: 
or 
list and count the different ways of choosing the following officers or representatives for student congress. Assume that no one can hold more than one office.Four representatives
A. ABCD, ABCE, ACDE, ADEB, BCDE; 5 B. ABCD, ABCE, ACDE, ADEB, BCDE, BCEA, BDEA, CABD, CEDB, DACE; 10 C. ABCD, ABCE, ACDE, ADEB; 4 D. ABCD; 1
Simplify the rational expression.
A. 
B. 
C. 
D. 
Solve the system by the addition method.
A. {(2, 0), (-2, 0)} B. {(3, 0), (-3, 0)} C. {(0, 3), (0, -3)} D. {(0, 2), (0, -2)}