Solve the problem.On the September 20 billing date, Emilio had a balance due of $573.56 on his credit card. During the next month, Emilio charged an additional $357.87 and makes a payment of $433. The interest rate on the card is 1.9% per month. Using the previous balance method, find the finance charge on October 20.
A. $6.80
B. $9.47
C. $2.67
D. $10.90
Answer: D
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Suppose that ? is in standard position and the given point is on the terminal side of ?. Give the exact value of the indicated trig function for ?.(15, 20); Find cos ?.
A. 
B. 
C. 
D. 
The function f is one-to-one. State the domain and the range of f and f-1. Write the domain and range in set-builder notation.f(x) = 
A. f(x): D = 
, R = 
;
f-1(x): D = 
, R = 
B. f(x): D = {x|x ? -1}, R = {y ? 0};
f-1(x): D = {x|x ? 0}, R = {y|y ? -1}
C. f(x): D is all real numbers, R is all real numbers;
f-1(x): D is all real numbers, R is all real numbers
D. f(x): D is all real numbers, R = 
;
f-1(x): D = 
, R is all real numbers
Use a calculator to find 
.
?
Please round the answer to the nearest ten-thousandth.
?
A. -0.7893 B. -0.7563 C. -0.7863 D. -0.7463 E. -0.7562
Find the sum using the formulas for the sums of powers of integers.
?
?
A. 18,496 B. 8,976 C. 1,496 D. 272 E. 136