Marlena spends a total of $58 at the Barnes and Noble. She purchases 4 books of equal price and spends an additional $4 on sales tax. Write an equation to find, b, the cost of each book.

4b + 4 = 58

Step-by-step explanation:

13.50$

Step-by-step explanation:

If the total tax is 4$ and then you purchased 4 books then it is 13.50$

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step-by-step explanation:

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