What is 3 times the sum of a and b? this needs to be written as an algebraic expression!

times means multiply,  sum means add.

3(a +b)

= 3a + 3b after distributing the 3

problem:

f(x) = - 2/3x + 5; f(5/2)

substitute 5/2 in for x:

f(5/2) = -2/3(5/2) + 5

simplify the right side:

f(5/2) = -5/3 + 5

f(5/2) = 10/3

f(5/2) = 10/3

i hope this !