A particular style of designer shirt costs the retailer S70 per shirt. At what price should the retailer mark them so he can sell them at a 20% discount of the original price and still make 20 % profit on his cost?

isocolese triangle

we know that the line connect a and b is the hyptonuse

so first find the hypotonuse length using the distance formula, call the length c

since it is an isocolese triangle, the lengths of the legs are the same

using pythagorean theorem,

in this case, a=b since isocolese triangle so we get

or

we can find c so we can find the distances

we know that if we draw 2 circles, each has center at a and b, and find where they intersect, we can the 2 possible locations for c

if a has center at (xa,ya) and b has center at (xb,yb), then we can solve where

and

intersect to find where they intersect

i'm not going to put an example because i have to go to class. i hope this explanation is enough

f(y)= y^2-10y+25

step-by-step explanation:

i'm pretty sure the second one is -4 and rational. the best way to solve is guess and check, or you may just know your multiplication facts really good.