Solve the problem.Tracy can wallpaper 4 rooms in a new house in 12 hours. Together with her trainee they can wallpaper the 4 rooms in 8 hours. How long would it take the trainee working by herself to do the job?
A. 12 hr
B. 28 hr
C. 56 hr
D. 40 hr
Answer: B
Mathematics
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Use implicit differentiation to find the specified derivative at the given point.Find 
at the point 
for ex2cos yz = 0.
A. 
B. - 
C. - 
D. 
Mathematics
Simplify.(7-2 × 2-4)-1
A. 76 × 26
B. 
C. 
D. 72 × 24
Mathematics
Write the number in standard notation.9.139 × 10-6
A. 0.000009139 B. 0.0000009139 C. 0.00009139 D. -9,139,000
Mathematics
Solve the problem.For what values of x would the rectangle have a perimeter of at least 260? 4x + 1 
A. 13 or greater B. 27 or greater C. 13 or less D. 27 or less
Mathematics