Answer:

Step-by-step explanation:
Let x = the number of $20 bills.
Then x + 6 = the number of $5 bills and
20x + 5(x + 6) = 455

x = 17 = number of $20 bills
x + 6 = 17 + 6 = 23 = number of $5 bills

Check:

OK.
Answer:
The variables are A and B. A for Andy, and B for Brett. B=18, and A=26
Step-by-step explanation:
A+B=44
A=B+8
B + 8 + B = 44
2B+8=44
2B = 36
B = 18
A = 26
The difference is two order of magnitudes, write down in the space 200
Answer:
1) 11.9
2) 3.6
3) 18.9
4) 45.4
Step-by-step explanation:
Math
Associative Property of Multiplication