How much pure acid should be mixed with 2 gallons of a 50% acid solution in order to get an 80% acid solution?

Neil bought 5 books. The average price of 2 books is 5 dollars. The average price of the rest of the books is 4 dollars. Find the total amount of money Neil paid for the 5 books

Why is it difficult / impossible to find even prime numbers?

Triangle ABC is similar to triangle XYZ. Which proportion can be used to find the measure of the missing side?

How can trigonometry be used to model the path of a baseball?

Solve the system of equation 2r+2s=50 and 2r-s=17 a. r=14, s=11 b. r=-8, s=33 c. r=3, s=11 d. r=25, s=33

How to simplify fractions

Peggy completed 5/6 of the math homework and they are completed 4/5 of the math homework they Peggy or a I complete more of your math homework

What is 8x+6y=-30 in y=mx+b form

What are two other negative integers that have the same sum - 2 and - 5 How would using a number line to find the sum 2 + 5 be different from using a number line to find the sum - 2 + (-5) ?

What is the equivalent ratios of 7 and 10