Solve the problem.Participants in a memorization experiment were able to recall an average of D digits in t minutes, where 
Use the graph below to estimate the number of digits recalled after 8 minutes.
A. 102 digits
B. 82 digits
C. 42 digits
D. 62 digits
Answer: D
Mathematics
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Find a formula for the nth term of the sequence.0, 2, 2, 2, 0, 2, 2, 2 (0, 2, 2, 2 repeated)
A. an = 1 + (-1)n(n+1)(n+2)/6 B. an = 1 + (-1)(n+1)(n + 2)/2 C. an = 1 + (-1)n(n-1)/2 D. an = 1 + (-1)n(n+1)/2
Mathematics
Solve for the variable.
= x
A. x = -4
B. x = 
C. x = 7
D. x = 4
Mathematics
Find a formula for the nth term of the arithmetic sequence whose first term a and common difference d are given.a = -9; d = 
A. an = 
n + 9
B. an = 
n - 
C. an = 
n - 9
D. an = -9n + 
Mathematics
Perform the matrix operation.Let C = 
and D = 
. Find C - 2D.
A. 
B. 
C. 
D. 
Mathematics