20.0% complete this is a single choice question; skip ahead to question content a b c d e confirm it takes about 14 person-hours of labor to break up a driveway and clear away the rubble. it takes about 8 person-hours of labor to pour and smooth concrete for the new driveway. about how many person-hours of labor does it take to break up a driveway, clear away the rubble, pour the concrete, and smooth the concrete?

$649.60

step-by-step explanation:

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)

answer is (b.

164 ft2)

a base  

18

b base  

7

h height  

8