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?

ur mom

step-by-step explanation:

look at the picture.

1.

ef : ab = 2 : 3

gf : cb = 2 : 3

gh : cd = 2 : 3

he : da = 2 : 3

2.

∠a ≅ ∠e

∠b ≅ ∠f

∠c ≅ ∠g

∠d ≅ ∠h

3.

use pythagorean theorem:

the length of the abcd trapezoid sides:

|ab| = 3 cm

|bc| = 10 cm

|cd| = 3(3) cm = 9 cm

|da| = 8 cm

the perimeter of abcd = 3 + 10 + 9 + 8 = 30 cm

the ratio of perimeters of the tarapezoids is equal 2 : 3.

substitute:

      cross multiply

      divide both sides by 3

answer is 17