Answer:
Step-by-step explanation:
hello :
19=3s+4
19-4 = 3s+4-4
3s=15
s=15/3
s=5
The Answer is $9.00 because if you just add 4.50 to 4.50 it is $9:00.
Answer:

Step-by-step explanation:

Answer:
5 * 10^10
Step-by-step explanation:
that's it bro. learn how to do it. then you won't need brainly anymore foo'.
20a + 4b - 9a + 3 = 11a + 4b + 3