Solve.If a flagpole 15 feet tall casts a shadow that is 20 feet long, find the length of the shadow cast by an antenna which is 21 feet tall. Round to the nearest tenth of a foot, if necessary.
A. 15.8 ft
B. 28 ft
C. 14.3 ft
D. 26 ft
Answer: B
Mathematics
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Suppose u and v are differentiable functions of x. Use the given values of the functions and their derivatives to find the value of the indicated derivative.u(1) = 2, u '(1) = -7, v(1) = 7, v '(1) = -3.
(2u - 4v) at x = 1
A. -24 B. 32 C. -26 D. -2
Mathematics
Use the appropriate identity to find the indicated function value. Rationalize the denominator, if applicable. If the given value is a decimal, round your answer to three decimal places.csc ?, given that sin ? = 
A. -4
B. 
C. 4
D. - 
Mathematics
Evaluate.cos2 315° - sin2 270° + 4 tan2 30°
A. - 
B. 
C. 
D. 
Mathematics
Divide. Express the quotient in lowest terms.
÷ 
A. 
B. 
C. 
D. 
Mathematics