How much pure acid should be mixed with 55 gallons of a 60%acid solution in order to get an 80% acid solution?

How do you find the slope of 5,-7 and - 7,1

When a number is decreased by 47%, the result is 20. What is the original number

Cards with the numbers 1 through 40 are placed in a box and throughly shuffled. What is the probability of randomly selecting a card with a number less than 10 or a multiple of 15? a) 3/10; b) 11/40; c) 1/20; d) 7/400

Include all of your work in your answer. Submit your solution. P = 3r + 2s; for s

Simplify (8x^4) (4x^3) divided by 7x^7

Describe two real life situations that uses parallel lines?

At many golf clubs, a teaching professional provides a free 10-minute lesson to new customers. A golf magazine reports that golf facilities that provide these free lessons gain, on average, $1 comma 700 in green fees, lessons, or equipment

Multiply 8 by the sum of 4 and 2

Which two numbers add up to - 11 that multiply to - 432?

Ou are having a family-barbeque. In attendance are a grandfather, a grandmother, two fathers, two mothers, four children, three grandchildren, one brother, two sisters, two sons, two daughters, one father-in-law, one mother-in-law and one