The height of a tree is given by the equation y=20+5x where y is its height in cm and x is the number of weeks after the tree is planted. (a) Find the height of tree after 3 weeks and 5 weeks.

(b) What does y-intercept represent?

A.(I)y=35

(ii)y=45

B.y represents height

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

the answer for this is 0.25 km. : )