The depth of water 
at my favorite surfing spot varies from 8 to 20 feet, depending on the time. Last Sunday high tide occurred at 5:00 A.M. and the next high tide occurred at 6:30 P.M. Use a sine function to model the depth of water as a function of time t in hours since midnight on Sunday morning.
?
A. 
B. 
C. 
D. 
E. 
Answer: D
Mathematics
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Determine all values for the digit d that make the first number divisible by the second number. If none exist, so state. 214,21d is divisible by 11.
Fill in the blank(s) with the appropriate word(s).
Mathematics
Use the Pythagorean theorem to find the missing side of the right triangle with legs a and b, and hypotenuse c. Approximate values to the nearest tenth when appropriate.a = 9 mi, b = 12 mi
A. 8 mi B. 14 mi C. 11 mi D. 15 mi
Mathematics
Use the rules of exponents to simplify the expression. Write the answer with positive exponents. Assume that all variables represent positive real numbers.(
)2(s-1/8y1/6)-4
A. 
B. 
C. 
D. 
Mathematics
Simplify.
÷ 
? 
A. 
B. 
C. 
D. 
Mathematics