The rectangular coordinates of a point are given. Find polar coordinates for the point.(100, -30) Round the polar coordinates to two decimal places, with ? in degrees.
A. (104.40, 106.70°)
B. (104.40, 16.70°)
C. (104.40, -106.70°)
D. (104.40, -16.70°)
Answer: D
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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 
Solve.A cube has a surface area of 6x2 + 108x + 486. Find the length of a side.
A. x - 9 B. x + 9 C. x + 54 D. 6(x + 9)
Solve the problem.A hall 130 feet in length was designed as a whispering gallery. If the ceiling is 25 feet high at the center, how far from the center are the foci located?
Fill in the blank(s) with the appropriate word(s).
Express the number in scientific notation.9220
A. 9.22 × 104 B. 9.22 × 10-3 C. 9.22 × 10-4 D. 9.22 × 103