Fernando is starting a new sales job, and needs to decide which of two salary plans to choose from. for plan a, he will earn $100/week plus 15% commission on all sales. for plan b, he will earn $150/week plus 10% commission on all sales.
a. write an expression for each salary plan if s is fernando's total weekly sales
b. for what amount of weekly sales us plan b better than plan a?

a.

step-by-step explanation:

step 1 distribute 2 to every term in the parentheses

step 2 add 10 on both sides of the equal sign

geometry: triangles

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call the larger triangle abc

then the smaller triangle cde is similar to abc (all angles are equal, aaa).  

ab is the side that is 36, and we wish to find de, the side corresponding to ab

area_cde = area_abc - area_cde --> area_abc / area_cde = 2

let x=length of de

ratio of areas = (ratio of sides)^2

+2+=+%2836%2fx%29%5e2+

+2+=+1296%2fx%5e2+

++x%5e2+=+1296%2f2+=+648+

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