Question 1199828
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Problem 1


Plug in p = 9 to find q = D(p)
{{{D(p) = 120/sqrt(p)}}}


{{{D(9) = 120/sqrt(9)}}}


{{{D(9) = 120/3}}}


{{{D(9) = 40}}}


Repeat for p = 25


{{{D(p) = 120/sqrt(p)}}}


{{{D(25) = 120/sqrt(25)}}}


{{{D(25) = 120/5}}}


{{{D(25) = 24}}}


The demand goes from 40 to 24, which is a decrease of 16 (since 40-24 = 16).


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Problem 2


The given function is  
f(x,y) = 5y+10x


We want to find f(6,2)
Wherever you see 'x', replace it with 6.
Wherever you see 'y', replace it with 2.
Then simplify.


f(x,y) = 5y+10x
f(6,y) = 5y+10*6 ...... replace x with 6
f(6,2) = 5*2+10*6 ...... replace y with 2
f(6,2) = 10+60
f(6,2) = 70
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