When 80% of a number is added to the number, the result is 216. what is the number?

About 400,000 people visited an art museum in december. what could be the exact number of people who visited the art museum?

Which of the following equations is of the parabola whose vertex is at (2, 3), axis of symmetry parallel to the y-axis and p = 4? a.)y-3 = 1/16 (x-2)^2 b.)y+3 = -1/16 (x+2)^2 c.)x-2 = 1/16 (y-3)^2

Can someone me out here and the tell me the greatest common factor