Question

what is the average rate of change from x=-10 to x=5?

Answer 1

Well, you left out the function, but I'll leave the details to you. The average rate of change for a function \(f(x)\) over the interval \([a,b]\) is
\[\frac{f(b)-f(a)}{b-a}\]
where \(a=-10\) and \(b=5\).

Answer 2

so would it be f(-5)/ 15 ?

Answer 3

No.
\[\text{ave. rate of change}=\frac{f(5)-f(-10)}{5-(-10)}=\frac{f(5)-f(-10)}{15}\]

Answer 4

Subtraction *does not* work like you think it does with a general function \(f\). What is \(f(x)\)?