Step-by-step explanation:
m= (4-0)/(2-1)
=4
y-int=1
y=mx+c
y=4x+1
Answer: 
<u>Step-by-step explanation:</u>
cos x tan x - cos x = 0
cos x (tan x - 1) = 0
cos x = 0 tan x - 1 = 0
tan x = 1

Answer:
After 10 weeks: 40 inches
Step-by-step explanation:
Equation
15 + 2.5w = h
15 = beginning height
2.5 = rate per week
w = weeks passed
h = total height
Answer:
<h2>B. 6</h2>
Step-by-step explanation:
![\text{use}\\\\a^{-n}=\dfrac{1}{a^n}\\\\==========================\\\\b^{-3}=\dfrac{1}{216}\\\\\dfrac{1}{b^3}=\dfrac{1}{216}\qquad\text{inverse both sides}\\\\b^2=216\to b=\sqrt[3]{216}\\\\b=6\ \text{because}\ 6^3=216](https://tex.z-dn.net/?f=%5Ctext%7Buse%7D%5C%5C%5C%5Ca%5E%7B-n%7D%3D%5Cdfrac%7B1%7D%7Ba%5En%7D%5C%5C%5C%5C%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%5C%5C%5C%5Cb%5E%7B-3%7D%3D%5Cdfrac%7B1%7D%7B216%7D%5C%5C%5C%5C%5Cdfrac%7B1%7D%7Bb%5E3%7D%3D%5Cdfrac%7B1%7D%7B216%7D%5Cqquad%5Ctext%7Binverse%20both%20sides%7D%5C%5C%5C%5Cb%5E2%3D216%5Cto%20b%3D%5Csqrt%5B3%5D%7B216%7D%5C%5C%5C%5Cb%3D6%5C%20%5Ctext%7Bbecause%7D%5C%206%5E3%3D216)