One-half of a roll of wallpaper covers 1/10 of a wall. how many rolls of wallpaper are needed to cover half the wall?

How many different three-digit numbers can be formed using the digits 1 comma 2 comma 9 comma 6 comma 4 comma 3 comma and 8 without repetition? for example, 664 is not allowed.

In an improper fraction, is the numerator equal to, less than, or greater than the denominator

Write an inequality for this description. - one fourth of the opposite of the difference of five and a number is less than twenty.