Solve the problem.Glenn and Paula want to dig an irrigation channel for their garden. Together it takes them 
to dig an appropriately sized irrigation channel. If Paula can dig the channel by herself in 
how long would it take Glenn to dig the channel by himself? Round to the nearest tenth, if necessary.
A. 1 hr
B. 2.3 hr
C. 4 hr
D. 3.8 hr
Answer: D
Mathematics
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Find the quadratic approximation of f at x = 0.f(x) = x
A. Q(x) = 100x2 B. Q(x) = 1 - 10x C. Q(x) = 1 + 10x D. Q(x) = 10x
Mathematics
Solve the problem.Find the equation for the tangent plane to the surface 
at the point 
A. 4x - 8y + 2z = -2 B. 4x + 8y + 4z = 16 C. 4x - 8y + 2z = 16 D. 4x + 8y + 4z = -2
Mathematics
Write the set in set builder notation.{21, 28, 35, 42, . . . , 91}
A. {x ? N? x = 7n for n ? N and 21 < x < 91} B. {x ? N? x = 7n for n ? N and x ? 21} C. {x ? N? x = 7n for n ? N and 14 < x < 98} D. {x? x = 7n for n ? N}
Mathematics
Find and correct the mistake.
What will be an ideal response?
Mathematics