Find the exact value of the expression. Do not use a calculator.sin 
- cos 
A. 
B. 1
C. 0
D. 
Answer: C
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Solve the problem.Suppose that the blood alcohol concentration (BAC) of a person who has been drinking is given by the following:total oz consumed × % alcohol × 0.075 ÷ body weight in lb - hr of drinking × 0.015. Find the BAC for a 115-lb woman who, in 2 hr, has drunk 6 beers. (Assume that each beer is 12 oz with a 4.3% alcohol content.) Round your answer to the nearest thousandth.
A. 0.172 B. 0.202 C. 0.167 D. 0.187
Identify which of these types of sampling is used: simple random, stratified, systematic, or convenience.A sample consists of every 20th student who leaves the library.
A. Systematic B. Stratified C. Simple random D. Convenience
An airplane leaves New York and flies south at a constant speed to Miami, where it lands and takes on new passengers. It then makes the return flight at a constant speed. The graph of distance north of Miami is shown. Make a graph of velocity for the round-trip. Be sure to label your graph appropriately.
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What will be an ideal response?
Add or subtract as indicated and write the result in standard form.(7 - 6i) + (2 + 9i)
A. -9 - 3i B. 9 - 3i C. 5 + 15i D. 9 + 3i