Answer:

0.16
Step-by-step explanation:
According to the question the mathematical model should be

Differentiating with respect to time we get

So, the rate of change of brightness after t days is 
After 1 day means 

The rate of increase after one day is 0.16.
I’ll would go with C&D
C&D the only answer that makes sense
28:21
because the same number has to multiply both sides of the ratio. so number = 7 and:
4x 7 = 28
3 x 7 = 21
Look at the picture.
The point-slope form:

We have the points (-3, -3) and (2, 0). Substitute:

Answer:
point-slope form: 
slope-intercept form: 
standard form: 