Answer:
1(29 + 29)= a
Step-by-step explanation:
If the DVD costs 29$, and he buys 2, then you will just add them and multiply them by one.
0.04 is 10x greater than 0.004
hope this helps
These numbers are "a" and "b".
Sum is 64, so
a+b=64
Difference is 42 so
a-b=42
So you've got:

When a+b=64 and a=53 you've got:
53+b=64
b=11
So these numbers is 53 and 11.
Answer:
the number is 10
Step-by-step explanation:
3x + 10 = 6x-20
20+10=6x-3x
30=3x
x=10