Helppp please no links this is so hard please help

Step-by-step explanation:

x + 4 = 12

x - 9 = 11

5x = 50

x/7 = 8

x + 10 = 20

three times a number plus seven equals thirty four

two times a number minus thirteen equals nine.

five times a number minus nine equals thirteen

two thirds of the sum of a number plus three equals six

one half of the result of five times a number minus one equals five

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

answer:

f(5/2) = 10/3

i hope this you!