How can you use Mental Math to determine if the ratio is simplified

A customer buys a CD for $15 and a video game. The customer pays a total of $42.80 for the two items, which includes 7% sales tax. Which equation can be used to find x, the cost of the video game before tax?

Claire went into a movie theater and bought 9 bags of popcorn and 2 pretzels, costing a total of $80. Melanie went into the same movie thearter and bought 7 bags of popcorn and 4 pretzels, costing a total of $72.

A shopper buys cat food in bags of 3 lbs. Her cat eats 3/4 alb each week. How many weeks does one bag last?

Find all solutions of the given system of equations and check your answer graphically. hint [see examples 1-4.] (if there is no solution, enter no solution. if the system is dependent, express your answer in terms of x, where y = y (x).

Express 87 24/25 as a decimal

For f (x) = 3x+1 and g (x) = x^2 - 6 find (f-g) (x)

If their are 19 girls and 15 boys in class. What is the ratio to boys to girl if 3 girls go to the bathroom

Ava needs to divide 378 guppies into 3 groups. How many guppies will be in each group?

Jose is thinking of a number. The number is not odd. The sum of the digits is divisible by 2. The number is a multiple of 11. It is greater than 5 times 4. It is a multiple of 6 It is less than 7 times 8 + 23 What is the number?

A standard brick is 3.625 inches wide, 2.25 inches high, and 7.625 inches long. How many bricks could be in a pallet of bricks that measures 4 feet on all sides? (One cubic foot is 12*12*12 cubic inches.) A. 1,757 B. 1,974 C. 1,709 D. 1,778