What is k-15=-8?

I need help with this one
Btw it is asking what k equals.

Rose drew a regression line for this paired data set. her line passed through (1, 2) and (3, 5) . what is the equation of rose's regression line?

Iwill give you ! what is the measure of ∠v ?

Which exponential function has an initial value of 2? f(x) = 2(3x) f(x) = 3(2x)