Question

Can anyone help me with letter c please. f(t)

Answer 1

we have given that $f(x)=2^x.$.

we need to find $f(t).$.

we know that we need to plug t in place of x in the equation f(x)=2^x.

$f(t)=2^t$ .for example for $f(4)=2^4$

they have plugged 4 in place of x. so we plug in plug t in place of x .

Answer 2

Well, they are just plugging the x in and evaluating the exponent. Here's what the answers would be:

$f(1)=2^1=2\\ f(3)=2^3=8\\ f(t)=2^t$

For the last one, it's no different then having an x there. t is just a variable as x is.