Given ƒ(x) = 8x − 15, find x when ƒ(x) = 9.

First, substitute for .

Now, follow the order of operations in reverse. Add to both sides of the equation.

Finally, divide both sides of the equation by .

Given f(x) =  9

8x - 15 = 9

8x = 24

∴ x = 3

Check :

f( 3) = 3 * 8 - 15

= 24 - 15

f(3) = 9

she played for 18.75 hours.

step-by-step explanation:

if she played 2/4 of a hour on tuesday. and there is 60 minutes in an hour and 60 divided by 4 is 7.5. and she played 2/4 of an hour on thursday then again 60 divided by 4 is 7.5, you add 7.5+7.5=56.25. now you have to do 1/4 of an hour, it equals 3.75. now you have to add them all up. 3.75+7.5+7.5=18.75

i hope this and i hope you get it right. it took me a while to get this done for you. : )

answ9x x 3=

step-by-step explanation: