How to solve quadratic equations by completing the square problems?

A candidate to the presidency wants to know what percentage of the registered voters in the country would vote for him. So, he gives that task to one of his aides and tells him he has 3 days to come up with the results.

A rectangular parking lot is enclosed by concrete barriers 5 feet long. There are 160 barriers in total. Determine the maximum area that can be enclosed.

There are 28 students in math class, 22 of the students passed a recent test. What percentage passed the test

A one year old baby weighs 400% of its birth weight. What should a one year old baby weigh if it was 8 pounds at birth?

What is the solution set of the quadratic inequality f (x) >0

45 cm is equivalent to how many inches

What is the answer to 2 (3.14) (2) ?

Mary walked 23.61 miles this month. That is 8.625 more miles than she walked last month. What is the total number of miles she walked in both months?

2x + y = 10 -4x + 5y = 22

How is multiplying 0.3 by 10 like multiplying 0.3 by 0.01? how is it different?