Suppose that the number u were thinking about is x thus :
Multiply both sides by 4
Divide both sides by 3
The answer is 654
1298-4x=171+3x
1127-4x=3x
1127=7x
161=x now plug this in to the original equations 1298-4(161)=171 + 3(161)
1298-644 =171 + 483
654 = 654
The key thing here is that x is the number of years AFTER 1990, therefore for part A plug in 0 to get 743
For part B plug in 12 and 17 then subtract the smaller from larger.
I got 1470.6 for 2007 and 1380.2 for 2002
Subtracting gives 90.4, which rounds to 90 because .4 of a prisoner doesn't make sense
Final answer:
(A) 743
(B) 90
Hope I helped :)
If the decimal can't be written into a ratio, then it is not rational.
Let's represent the price of a container of milk with n:
4n + 4(n + 75) = 700
4n + 4n + 300 = 700
8n = 400
Divide:
n = 50
50 + 75 = 125
One sandwich costs $1.25