The equation y = 36 + 18x models the relationship
between the height y, in inches, of a typical golden
delicious apple tree and the number of years, x, after
it was planted. if the equation is graphed in the
xy-plane, what is indicated by the y-intercept of the
graph?
a) the age, in years, of a typical apple tree when it
is planted
b) the height, in inches, of a typical apple tree
when it is planted
c) the number of years it takes a typical apple tree
to grow
d) the number of inches a typical apple tree grows
each year

Option B) The height, in inches, of a typical apple tree

Step-by-step explanation:

Let

x----> the number of years, after the tree was planted

y ---> the height in inches, of a typical golden  delicious apple tree

we have

Remember that

The y-intercept is the value of y when the value of x is equal to zero

In this problem

The y-intercept is the height of the tree when it was planted (x=0)

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.

its less than 713.21 but greater than 5.2