How much pure acid should be mixed with 7 gallons of a 40 % acid solution in order to get an 80 % acid solution?

Evaluate the following expression for x = 2 and y = 5. Simplify. x^2y - xy^2 + 3y

How do you write 8/10 as a percent

What is the value of the following numbers 5*3

Which expression equals 6 when a = 5 and b = 1/3? Circle all that apply. A) 9b^2 + 3a - 10 B) a^2 - 20 - 3b C) 3 (a - 2) - a + a 6b D) 9b + ab

A guitar originally costs $600, but it is on sale for 45% off. If a customer buying the guitar has a coupon for $30.00 off of any purchase, what will her final price be on the guitar?

Brass costs $0.90 per pound, copper costs $2.15 per pound, and aluminium costs $0.75 per pound. Which medal would you recommend be for, for use as a heat sink in the tablet?

You earn $72 for every 8 hours you spend shoveling snow. You earn $60 for every 5 hours you spend babysitting. For every 3 hours you spend babysitting, you spend 2 hours shoveling snow. You babysit for 15 hours in January.

Beth can run 3 miles in 25.8 minutes. How long does it take her to run1 one mile you

Kelly has a ribbon that is 60 inches long she cuts at 40% of ribbon for an art project while working on the project she decided she only needs 35% of the pieces she cut off how much of the ribbon does Kelly end up using in a project

Which expression is equivalent to x (y+z) ? a) xyz b) x+y+z c) xy+z d) xy+xz