Solve the equation for y.5x + 8y = 5
A. y = 
B. y = 
C. y = -40x + 40
D. y = 
Answer: A
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The scalar function div(grad f) = ? ? ? f (also written ?2f) is called the Lapalacian, and the function f satisfying ?2f = 0 is said to be harmonic. ?2f = fxx + fyy + fzz. Find ?2f for the following function and decide if it is harmonic.f(x, y, z) = x2y2z2
A. harmonic B. not harmonic
Find the equation of the indicated least-squares curve. Sketch the curve and plot the data points on the same graph.For the points on the following table, find the least-squares curve y = mx2 + b.
A. y = 4.14x2 + 1
B. y = 1.07x2 - 0.76
C. y = 2.14x2 - 1.52
D. y = 3.5x2 + 5.9
Write the whole number in expanded form.20,300
A. 20,000 + 300 B. 2,300,000 C. 20,000 + 3000 D. 2000 + 300
Solve the problem. Round to two decimal places unless otherwise indicated.If the average cost per unit C(x) to produce x units of plywood is given by C(x) = 
, what is the unit cost for 50 units?
A. $-4.00 B. $5.00 C. $0.60 D. $6.00