Aiden is buying an incubator for his chicken eggs. He has a coupon for 20% off. If the incubator costs $149.99 and sales tax is 7%, what is the final cost of the incubator including tax?

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)

question 1: step-by-step explanation:

1/4 of 84 = 84÷4= 21

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