A survey was given to a random sample of voters in the United States to ask about their preference for a presidential candidate. The percentage of people who said they preferred Candidate A was 78%. The margin of error for the survey was 3%. Write a confidence interval for the percentage of the population that supports Candidate A. PLEASE GIVE STEP BY STEP EXPLANATION. NO BLANK ANSWERS.

So the first thing we do is to multiply the top equation by 3. the reason i want to do this is i notice there will be a 6y on both equations and can possibly add/subtract them. so we get 6y = -3x + 27. adding that and the second equation we get 6x = 27-15 which is 12. divide by 6 and we get 2. ∴ x = 2. substituting 2 into the first equation we get 2y = -2 + 9 which is 7. divide by 2 and we get 7/2. ∴ y = 7/2, x = 2.

1/b^3m^3               i don't know why you couldn't do it yourself its not that hard                     

4010 is the sides of the other two sides! it's an equilateral triangle