Answer:
A. 4.8 centimeters
Step-by-step explanation:
First find the equation for the line. To do that take the two points you know the line crosses through, (0,2) and (5,4) and find the slope first.
m = slope
m = (y2-y1)/(x2-x1)
m = (4-2)/(5-0)
m = (2/5)
m = .4
Then plug that into the standard for of an equation for a line.
y = mx + b
y = .4x + b
To find b, the y-intercept, plug in an x and y value you know of, like (0,2) or (5,4), and then solve for b.
2 = .4(0) + b
2 = 0 + b
b = 2
Now you have your equation.
y = .4x + 2
To figure out the growth after 7 weeks plug the number seven into the equation. And since weeks lies on the x-axis you plug 7 in for x.
y = .4(7) + 2
y = 2.8 + 2
y = 4.8
