20% of what number is 80?

I need the right answer, this is my last shot of passing.

1 in/2.54 cm = 90 in/? cm

The length of a rectangle exceeds its width by 3 inches, and the area is 54 square inches. What are the length and width of the rectangle?

The correlation coefficient r between a person's age, x, and the number of websites visited per day, y, is 0.562. What percent of the variation in the number of websites visited cannot be explained by differences in the people's ages? A. 31.6% B. 43.

Determine the slope of the function as a unit rate for the linear situation. The temperature of a room decreases at a constant rate of 1.7 °C per hour.

One fith of twenty five people in the bakery made a preorder how many people did not make a predictor

Who said "a formal manipulator in mathematics often experience the discomforting feeling that his pencil surpasses him in intelligence"?

Circle Y has a center at (2,3) and a radius of 4. Circle Z has a center at (2,-3) and a radius of 10. What is the scale factor of all radii of circle Y to all radii of circle Z?

What fraction of 1 gallon is five cups

Find the mean, median, and mode of the data. 67, 59, 34, 71, 59

Salma purchased a prepaid phone card for $15 Long distance calls cost 6 cents a minute using this card. Salma used her card only once to make a long distance call. If the remaining credit on her card is $13.14 how many minutes did her call last?