Multiply. Write the result in the form a + bi.7i(4 - 7i)
A. 28i - 49
B. 28i + 49i2
C. 49 + 28i
D. 28i - 49i2
Answer: C
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Evaluate the integral using the given substitution.
, u = cot 7?
A. - 
cot2 7? + C
B. 
csc3 7? cot2 7? + C
C. 
cot2 ? + C
D. - 
tan2 7? + C
List all the factors of each number.162
A. 2 ? 3 ? 3 ? 3 B. 2 ? 3 ? 3 ? 3 ? 5 C. 2 ? 3 ? 3 ? 3 ? 3 D. 2 ? 2 ? 3 ? 3 ? 3 ? 3
Rationalize the denominator. Assume that no radicands were formed by raising negative numbers to even powers. 
A. 
B. 
C. 
D. 
State sales tax is based on retail price. An item that sells for $180.99 has a sales tax of $17.4. Find a mathematical model that gives the amount of sales tax y in terms of the retail price x. Use the model to find the sales tax on a $589.99 purchase. (Round your answer to four decimal places.) ?
A. 
B. 
C. 
D. 
E. 