Pure acid is to be added to a 10 % acid solution to obtain 21 L of a 40 % acid solution.

9x+10y=29 10x+9y=28 Solve by elimination

Match each item with the correct unit price. 1. 20 for $1.56 2. $3.78 for 6 3. 2 1/2 for one dollar 4. 5 at $3.90 5. 1 1/2 for $1.58 A. 7.8 cents each B. 63 cents each C. 40 cents each D. 78 cents each E. $1.05 each

How do i solve y=x-1

A component in a music system has a life expectancy of 2,400 hours with a standard deviation of 300 hours. If an average person listens to music for 1,000 hours in a year, the probability that the component lasts for more than 3 years is

Robert invests $800 into an account at 1.8% interest compounded annually. He will make no deposits or withdrawals on this account for 3 years. Which formula could be used to find the balance, in the account after 3 years?

is an altitude in triangle ABC. Which statements are true? Check all that apply

Write a recursive rule for the following arithmetic sequence: 27, 24, 21, 18, 15,

yasmin bought a reel of thread for sewing that is 10 meters long. Yasmin uses 650 centimeters ... how much thread in meters is left on the reel!

Change 20% into a fraction

Give the domain and the range of each function. X Y 2 4 5 5 8 6 2 7