Solve the equation for the given variable k/3-11=-20

= - 20

You can subtract the numbers in the parenthesis:
(3-11) = (-8)

Multiply the denominator to both sides so it cancels out and isolates the variable × -8 = - 20 × -8
-8 and -8 cancels out

k = 160

Quick check:
= -20
= - 20
- 20 = - 20
Yes its right

the answer is: k =160

Polar coordinates is 8,9

What is the last question i don’t see it?