Solve the problem.Tides go up and down in a 14.8-hour period. The average depth of a certain river is 7 m and ranges from 4 to 10 m. The variation can be approximated by a sine curve. Write an equation that gives the approximate variation y, if x is the number of hours after midnight and high tide occurs at 5:00 am.
A. y = 7 sin 
B. y = 3 sin 
C. y = 3 sin 
D. y = 7 sin 
Answer: B
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There are 20 colored chips in a bag, 14 white and 6 red. What are the odds for selecting a red chip?
A. 7 to 3 B. 30% C. 3 to 7 D. 70%
Solve the problem.Jane Hightone sells CDs for $8.25 each. Her initial cost to set up the business was $9100, and each CD costs her $3.25. Express the revenue R as a function of x, where x represents the number of CDs sold.
A. R(x) = 3.25x B. R(x) = 3.25x + 9100 C. R(x) = 11.5x D. R(x) = 8.25x
Simplify the expression. Assume all variables represent positive real numbers.-8
+ 19
A. -27
B. 28
C. -12
D. 11
In the year 2000, the pet population in Starkesville was measured to be 4,000. By 2010, the population had grown to 6,000. Assume the pet population continues to change linearly. If x represents the number of years since 2000, what equation could be used to predict the pet population in 2025?
a. P(x) = 400x + 2000 b. P(x) = 200x + 4000 c. P(x) = 2000x + 400 d. P(x) = 25x + 4000