Use percents, percent equations, and/or percent proportions to solve the application.Jeremy switches from drinking regular soda to drinking diet soda. If his regular soda contains 205 mg of sodium per liter and the diet soda contains 200 mg of sodium, find his percent decrease in calories by switching from regular to diet soda.
A. 97.6%
B. 50.6%
C. 2.4%
D. 2.5%
Answer: D
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Replace the polar equation with an equivalent Cartesian equation. 9r cos ? + 2r sin ? = 1
A. 9y + 2x = 1
B. 9x + 2y = 1
C. 9x + 2y = x2 + y2
D. 
+ 
= 1
Graph the function over a one-period interval.y = 
cos 
A. 
B. 
C. 
D. 
Solve the problem.A chair manufacturing company has two different factories. The profit function for Factory I when x chairs are manufactured and sold is as follows: P(x) = -0.05x2 + 20x - 500The profit function for Factory II when x chairs are manufactured and sold is as follows: P(x) = -0.05x2 + 30x - 2500For what number of chairs is the profit the same at both factories, and what is the profit?
A. 200 chairs; $1500 B. 0 chairs; $0 C. 100 chairs; $1000 D. 300 chairs; $2000
Use the definition or identities to find the exact value of the indicated trigonometric function of the acute angle ?.tan ? = 
Find cos ?.
A. 
B. 
C. 
D. 