The answer for this question is 22.25, the easiest way to work out the area of a triangle is to use a triangle area calculator.
1 bottle contains 3 liter
12 bottles contains (12*3) = 36 liter
1 case contains 12 bottle
5 cases contains (12*5) = 60 bottle
-12n + 17 = 23
-17 -17
-12n = 6
/-12 /-12
N = - 1/2
N = -.5
We could find the error first, but if we solve the equation, we can compare our answers to find the error. So,
7x + 12 + 3x = 8
10x + 12 = 8
10x = -4
x = -4/10
x = -2/5.
When we compare the two, we see that our second line is vastly different, and we can easily isolate the mistake, finding that it occurs when they disregard the variable in the 3x term and subtract 8 by 3 rather than combining the terms 3x and 7x together.
