Helen purchased 3 copies of a book online at a 20% discount. she paid $10 for shipping that was not discounted. write an equation that represents the cost of buying a book online. how much was the original price of one copy of the book if her total ended up being $40?

29933333.33

step-by-step explanation:

here is a big fat

answer: (-8,4) are the coordinates of a

step-by-step explanation:

let the side of square abcd is x .

thus the area of square abcd is .

now, by the diagram area of triangle ead= 1/2 × ea × ad = 1/2 × ea × x

( because ad is the side of square)

and, according to the question,

the areas of square abcd and right ead are equal.

⇒

⇒ea=2x

thus, ea: ab=2: 1

therefore, point a divides line segment eb into the ratio 2: 1.

⇒ by sectional formula coordinates of a are,

=

=

=(-8, 4)

thus the coordinates of a are (-8,4)