Answer:
3(2040x-4039)/4x
Step-by-step explanation:
1) x=1
2) x=2.9
3) x=-10
4) x=?
5) IDK
5.) it is already in order
6.)0.3, 3/9, 0.8
7.) 2/16 & 3/24
8.) 4/14 & 6/21
Answer:
8 nickels and 9 dimes
Step-by-step explanation:
If all were dimes, the value would be $1.70. It is $0.40 less than that. Changing a dime for a nickel reduces the value by $0.05, so there must have been $0.40/$0.05 = 8 such changes.
There are 8 nickels and 9 dimes.
_____
<em>Check</em>
8 · 0.05 + 9 · 0.10 = 0.40 + 0.90 = 1.30 . . . the answer checks OK
B, because to substitute for a variable you have to have an equation to substitute first.
