7 times the sum of R and 4

In a group of 100 people, 70 have a DVD player, 60 have a CD player and 20 have neither. How many have both?

What is the expanded form of 720, 080 with exponents

Factor the trinomial below 4x^2+19x-5 A: x+5 B: 4x-1 C: 2x-5 D: x-5 E: 2x+1

The school play is selling tickets for their new show. Adult tickets cost $10 while child tickets cost 5$. Their goal is to earn a total of $350. Describe some possible combination of adult and child tickets that will earn $350.

What fraction of 450 gallons is 153 l? Give your answer in simplest form. 1 gallon = 4.5 l.

The ratio of dogs to cats at an animal shelter is 33 to 22. How many dogs are at the shelter if there is a total of 30 animals?

Mr. Barclay sold goods for $21 and lost a percent equal to the number of dollars he paid for the goods. How much did the goods cost him?

Felipe is saving money to buy a game. So far he has saved $30, which is five-sixths of the total cost of the game. How much does the game cost?

A cabin has room for seven campers and two counselors. How many cabins are needed for a total of 49 campers and 14 counselors?

Solve for x and check your solution 4x+3=x