Write a chain rule formula for the following derivative.
for z = f(r, s); r = g(t), s = h(t)
A. 
= 
B. 
= 
+ 
C. 
= 
+ 
D. 
= 
+ 
Answer: B
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Graph the line.2x - y - 9 = 0
A. 
B. 
C. 
D. 
Assume that the cities lie on the same north-south line and that the radius of the earth is 6400 km. Find the distance between City A, 34° N and City B, 37° N. (Round to the nearest kilometer.)
A. 406 km B. 372 km C. 335 km D. 301 km
Solve the problem.At SuperStop, gasoline costs 
per gallon when you pay with a credit card, 
per gallon less when you pay with cash. How much money will it cost to fill a 12-gallon tank if you pay with cash?
A. $17.04 B. $16.20 C. $16.94 D. $13.49
Find the expected value.Mr. Cameron is sponsoring an summer concert. He estimates that he will make $300,000 if it does not rain and make $60,000 if it does rain. The weather bureau predicts the chance of rain is 0.34 for the day of the concert. An insurance company is willing to insure the concert for $150,000 against rain for a premium of $30,000. If he buys this policy, what are his expected earnings from the concert?
A. $180,000 B. $300,000 C. $270,000 D. $239,400