Answer:

Step-by-step explanation:
Hello,
let's find a and b reals so that


we identify the terms in 
9 = 3a
we identify the terms in x
-18 = 3b + a
we identify the constant terms
-7 = b
so ti goes with a = 9/3 = 3, b = -7
so we can write

so 
hope this helps
Answer:
432
Step-by-step explanation:
60 minutes is one hour
60 times 4=240
=240+192=432
Answer:
the answer is one solution
216. hope this helps you.