What is the value of 12( 3x + 5x), when x = 7?

642

Step-by-step explanation:12(3*7+5*7)

12(21+35)

12*56=642

I'm pretty sure that it's 672

Step-by-step explanation:

Ok, so all you gotta do is replace x with 7. so then it would look like 12(3(7)+5(7)). then you multiply whats inside the parenthesis so that you get 12(21+35). then you add, 12(56). then you just multiply.

Step-by-step explanation:

the 2nd line can be rewritten as y < x-3

So, any value that is less than both 4x+4 and x-3 will work

Pick any value you want for x, and figure y possibilities

x=0; x-3=-3, 4x+4=4, so y<-3 ... (0,-5) will work

I'm sure you can now come up with other pairs.