Evaluate the function $f(r)=\sqrt{r+1}-4$ at the given values of the independen a. $f(-1)$ b. $f(63)$ c. $f(x-1)$ a. $f(-1)=\square($ Simplify your answer.) b.$f(63)=\square($ Simplify your answer.) c.$f(x-1)= \square($ Simplify your answer.)

Step 1 ：Substitute \(r\) with \(-1\) in the function \(f(r)=\sqrt{r+1}-4\)

Step 2 ：Calculate \(f(-1)=\sqrt{-1+1}-4=\sqrt{0}-4=0-4=-4\)

Step 3 ：\(\boxed{f(-1)=-4}\)

Step 4 ：Substitute \(r\) with \(63\) in the function \(f(r)=\sqrt{r+1}-4\)

Step 5 ：Calculate \(f(63)=\sqrt{63+1}-4=\sqrt{64}-4=8-4=4\)

Step 6 ：\(\boxed{f(63)=4}\)

Step 7 ：Substitute \(r\) with \(x-1\) in the function \(f(r)=\sqrt{r+1}-4\)

Step 8 ：Calculate \(f(x-1)=\sqrt{(x-1)+1}-4=\sqrt{x}-4\)

Step 9 ：\(\boxed{f(x-1)=\sqrt{x}-4}\)