Write the complex number in rectangular form.
cis 270°
A. -
B. -i
C. -2i
D. -i
Answer: B
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Solve the problem.Find an upper bound for 
in estimating 
with n = 7 steps.
A. 
B. 
C. 
D. 
Use reference angles to find the exact value of the expression. Do not use a calculator.cos 
A. 1 B. 0 C. -1 D. undefined
Solve the problem.How many gallons of a 30% alcohol solution must be mixed with 60 gallons of a 14% solution to obtain a solution that is 20% alcohol?
A. 27 gal B. 12 gal C. 7 gal D. 36 gal
Solve. If necessary, round percents to the nearest tenth, dollar amounts to the nearest cent, and all other numbers to the nearest whole.An entrepreneur borrowed $19,000 from a bank at 8% for 9 months to start a new project. Find the total amount due the bank the end of the 9-month period.
A. $32,680.00 B. $1140.00 C. $30,400.00 D. $20,140.00