They always say to do the problem in parentheses first
1e+6 is the amount of cubic CM (or one million 1000000)
Perimeter = x + 5x - 2 + 7x - 4
= 13x - 6 meters answer
Add up the 13+12 to get 25 then divide 500,000 by 25 to get 2,000. Then multiply it by 13 to get 26000 and by 12 to get 24000. Subtract 26000 minus 24000 to get 2000. 2000 is your answer.
16:24 students made at least 80% on the test. The question is what is the ratio of students who scored below an 80% to the total number of students. 8:24 would be the right answer, but since it is asking for the answer in the simplest form, it would be 1:3.
