Find the exact value of the expression. Do not use a calculator.cos 50°sin 40° + sin 50°cos 40°
A. 0
B. 2
C. -1
D. 1
Answer: D
Mathematics
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Determine the real solutions to the system of nonlinear equations.
A. 
, 
B. 
, 
C. 
, (1, 5)
D. 
, (1, 5)
Mathematics
Solve the problem.One maid can clean the house three times faster than another. Working together they can clean the entire house in 3 hours. How long would it take the faster maid cleaning alone?
A. 
hr
B. 4 hr
C. 5 hr
D. 3 hr
Mathematics
Solve the equation.
= 
A. ?
B. {- 
}
C. {
}
D. {7}
Mathematics
?The area of a circular sun spot is growing at a rate of
. How fast is the radius growing at the instant when it equals 5,000 km? Round your answer to three decimal places.
?
A. 
B. 
C. 
D. 
E. 
Mathematics