Solve the problem.Elissa wants to set up a rectangular dog run in her backyard. She has 28 feet of fencing to work with and wants to use it all. If the dog run is to be x feet long, express the area of the dog run as a function of x.
A. A(x) = 16x2 - x
B. A(x) = 15x - x2
C. A(x) = 13x - x2
D. A(x) = 14x - x2
Answer: D
Mathematics
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Simplify. Assume that no radicands were formed by raising negative quantities to even powers.
A. 
B. 
C. 21
D. 
Mathematics
Compute r''(t).r(t) = (2 ln(8t))i + (3t3)j
A. r''(t) = 
i + 9tj
B. r''(t) = 
t-2i + 18tj
C. r''(t)= - 
t-2i + 18tj
D. r''(t) = - 
i + 18tj
Mathematics
Find the root. Assume that all variables represent positive numbers.
A. 9x8 y8 B. -3x12 y12 C. 3x8 y8 D. -3x8 y8
Mathematics
Convert the units using unit fractions.405 min = 
hr
A. 24,300
B. 6
C. 4050
D. 6
Mathematics