Solve the problem.Megan is having her yard landscaped. She obtained an estimate from two landscaping companies. Company A gave an estimate of $240 for materials and equipment rental plus $55 per hour for labor. Company B gave an estimate of $320 for materials and equipment rental plus $45 per hour for labor. Determine how many hours of labor will be required for the two companies to cost the same.
A. 7 hours
B. 12 hours
C. 8 hours
D. 11 hours
Answer: C
Mathematics
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Evaluate. The differential is exact.
A. e15 - 3 B. 0 C. e15 - 1 D. e7 + e2 + e6 - 1
Mathematics
Find the work done by F over the curve in the direction of increasing t.F = -4zi + 2xj + 10yk; C: r(t) = ti + tj + tk, 0 ? t ? 1
A. W = 
B. W = 4
C. W = 8
D. W = 16
Mathematics
Use the product-to-sum identities to rewrite the expression as the sum or difference of two functions.sin 6? sin 2?
A. sin2 12?2
B. 
[cos 4? - cos 8?]
C. 
[cos 8? - cos 4?]
D. 
[sin 8? + cos 4?]
Mathematics
Given a normal distribution with mean 120 and standard deviation 5, find the number of standard deviations the measurement is from the mean. Express the answer as a positive number.114.2
A. 1.16 B. 2.4 C. 2.12 D. 1.2
Mathematics