20 is how much less than 30? what present less

David installed a device on his car that guaranteed to increase his gas mileage by 15%. He currently gets 22 miles per gallon. How much will the gas mileage increase after installing the device?

G (x) = - x2 - 6x what's the vertex

A family plans to have the hardwood floors in their square dining room re-finished, and new baseboards installed. The cost of re-finishing the hardwood floors is $2.25 per square foot and the cost of purchasing and installing the new baseboards $14.

At little rock school, 476 students ride their bike to school. if this number is 85% of the school enrollment, then how many students are enrolled?

Mark and Don are planning to sell each of their marble collections at a garage sale. If Don has 7 mo than 3 times the number of marbles Mark has, how many does each boy have to sell if the total numbe of marbles is 103?

Find the range of the function f (x) = 10-x squared

What is ctg of pi? in numbers what it represents?

A+b=0 ab=-36 what is the value of a-b?

A bag of marbles contains 4 green marbles, 3 blue marbles, 2 red marbles, and 5 yellow marbles. How many possible outcomes are there when choosing a marble from the bag

Last month, Korey's Comics had a gross profit of $2,385 with a monthly revenue of $3,465. Korey expects similar sales this month, but he would like to build up his in-store browsing selection, and purchases an additional assortment of comic books