Does anyone understand 4.05 f(x)=3(4)

what are you trying to find ?

so if  f(x) equals 3(4) that means f times x so f time x = 3(4) which equals 3 times 4 so f =3 and x=4 so 3 times for eqauls 12 so you put a 12.0 and alighn the decimals like so 4.05

                         12.0 but you do this only if you are adding subtraction and multipling

Step-by-step explanation:

hope this isnt confusing

54

step-by-step explanation:

341

step-by-step explanation:

all you have to do is 9x31 (which equals 279) and then 20x31 (which equals 620). then you have to subtract. 620-279=341.