X squared minus 20x what value should be added to the equation to create a perfect square

Eric made a drawing of his rectangular bedroom with the scale 1 inch=3 feet. The drawing was 5 inches long 4 inches wide. What was the actual area of his room?

When a population grows according to the logistic model, what is the value of the instantaneous population growth rate (dn/dt) when the population is stable? a. dn/dt = 0 b. dn/dt = n c. dn/dt = r d. dn/dt = k?

Way to write digit place value

Twice the difference of a number and 9 is equal to three times the sum of the number and 6

Write a quadratic variation equation if g (x) varies directly with x2, and g (x) = 108 when x = 6.

Each year Lizzie school purchase student agenda books which are sold in the school store this year the school purchased 350 books at a cost of 1,137.50.

What percentage is the fraction 2/10 equal to? 2% 20% 5% 50%

What are two equivalent ratios of 5:3 * your answer?

Antoni has read 147 pages of a book. He has completed 70% of the book. How many more pages does he need to read to finish the book

I need to know what equals-27