Solving for a variable in an equation means, we are changing the subject of formula of the equation.
The equation of r is: 
The equation is given as:
We start by multiplying both sides by 3
Rewrite as:
Divide both sides by 
Cancel out common factors
Take square roots of both sides
Evaluate the right-hand sides
Make r the subject
Hence, the resulting equating for r is:
Read more about the subject of formulas at:
brainly.com/question/21866313
What data is the table referring to?
The answer for the question is a
Answer:
y=-5/2x+4
Step-by-step explanation:
find the slope by using y2-y1/x2-x1
-1-19/2-(-4)
simplify
-20/8
simplify
-5/2
use slope-intercept form, y=mx+b
since we know the slope, find b
plug in one of the ordered pairs into the equation
-1=(-5/2)(2)+b
simplify
-1= -10/2+b
simplify
-1=-5+b
add 5 to both sides
b=4
plug b into y=-5/2x+b
y=-5/2x+4
