Find the exact value of the expression.sin 25° cos 35° + cos 25° sin 35°
A. 
B. 
C. 
D. 
Answer: B
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Solve the problem.A data set consists of 542 lightbulbs. Over a long period of time, the lifetimes of those lightbulbs have been tested. It has been found that the mean and standard deviation are known and the lifetimes of the bulbs are normally distributed. What number of bulbs within this data set will have lifetimes that lie between the mean and two standard deviations below the mean? Round your answer to the nearest whole number.
A. 185 B. 268 C. 74 D. 259
Change the logarithmic expression to an equivalent expression involving an exponent.ln 
= -5
A. 
e = -5
B. -5e = 
C. 
-5 = e
D. e-5 = 
Factor when possible.7x2 - 21xy - 28y2
A. 7(x - y)(x + 4y) B. (7x - 7y)(x + 4y) C. 7(x + y)(x - 4y) D. Prime
Solve.Persons taking a 30-hour review course to prepare for a standardized exam average a score of 620 on that exam. Persons taking a 70-hour review course average a score of 782. Find a linear equation which fits this data, and which relates score to review time. Use this equation to predict an average score for persons taking a 51-hour review course. Round to the nearest tenth.
A. 697.8 B. 719.1 C. 709.3 D. 705.1