Solve the problem.For the surface z = f(x,y), show that the surface integral 
d? = 
dxdy.
What will be an ideal response?
Answers will vary. Let r = xi + y j + f(x, y)k. Then |ru×rv | = 
. The assertion follows.
Mathematics
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Solve the problem.Stephanie receives a salary of $650 per month plus a commission of 5.5% on the first $3,000 of sales, and 7% of all sales over $3,000. Find Stephanie's gross pay for the month if her sales were $9,880.
A. $1,506.60 B. $2,781.60 C. $1,296.60 D. $646.60
Mathematics
Provide an appropriate response.An 18 oz box of cereal costs $3.51. Find the constant of direct variation.
A. $0.144 B. $6.32 C. $0.195 D. $5.12
Mathematics
Choose the most reasonable unit of measure.Height of an adult: 5.7 
(in., ft, yd, mi)
A. yd B. in. C. mi D. ft
Mathematics
Evaluate the expression for the given value or values.- 
, for y = -6, z = -3
A. 2 B. 3 C. -3 D. -2
Mathematics