How can you use mental math to determmine if a ratio is simplifiefied

What percent of 6 is 18?

Ashley has some pennies and some nickels. She has at most 22 coins worth a minimum of $0.78 combined. If Ashley has 4 pennies, determine the minimum number of nickels that she could have. If there are no possible solutions, submit an empty answer.

Cookies are sold singly or in packages of 10 or 30. With this packaging, how many ways can you buy 60 cookies?

A rectangle field has an area of 1764 m^2. The width of the field is 13m more than the length. What is the perimeter of the field?

Simplify: (-7a - 10c) - (-11a + 20c) - (-24a - 11c) A. 28a - 19c B. - 42a - 41c C. 26a + 38c D. 28a + 19c

Jorge bought a car for $41,902. He paid for the car with a check. Round the price to the nearest:

Use distributive property to create an equivalent expression to 7x + 56

The average speed of an object (in feet per second) is determined by the equation S=4√d, where d is the distance in feet the object is dropped.

What is the expanded form of this number? 509.307

Danielle can type 600 words in 30 minutes. How many words can she type per minute?