Simplify.
A. -23
B. - 
C. 
D. 23
Answer: D
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The letters x and y represent rectangular coordinates. Write the equation using polar coordinates (r, ?).y = x
A. r = sin ? B. r = cos ? C. sin ? = cos ? D. sin ? = - cos ?
Simplify the rational expression.
A. 
B. 
C. 
D. 5x
Use the appropriate geometric formula to determine the missing dimension (radius, length, or height).Use 3.14 for ?. Round to the nearest hundredth when appropriate.A sphere with a volume of 30 cubic feet.
A. r = 1.93 ft B. r = 367.92 ft C. r = 3.11 ft D. r = 7.17 ft
The frequency of vibrations of a piano string varies directly as the square root of the tension on the string and inversely as the length of the string. The middle A string has a frequency of 430 vibrations per second. Find the frequency of a string that has 1.25 times as much tension and is 1.4 times as long. ?
A. 373.4 vibrations / sec B. 343.4 vibrations / sec C. 353.4 vibrations / sec D. 383.4 vibrations / sec E. 363.4 vibrations / sec