3. for her chemistry experiment, marisol needs 2 liters of a 50% alcohol solution. the lab has two containers, one with 40% alcohol solution, and the other with 80% alcohol solution. (a) write a system of linear equations that you can use to determine how many liters of each type of alcohol solution marisol should combine to get 2 liters of a 50% alcohol solution. be sure to define your variables. (b) solve the system and determine how many liters of each type of alcohol solution marisol should combine. show all your work.

What is the common difference in the following arithmetic sequence? 7,3,-1,-5

How to solve a simultaneous equation involved with fractions?

As part of an annual fundraiser to raise money for diabetes research, diane joined a bikeathon. the track she biked on was 1,920 yards long. diane biked 38.5 laps. her sponsors agreed to donate an amount of money for each mile she biked. how many miles did she bike? first fill in the blanks on the left side using the ratios shown. then write your answer. given ratios: 5280ft / 1 mi , 1 mi /5280 ft , 1,920 yards / 1 lap , 1 lap / 1,920 yards , 3 ft / 1 yard , 1 yard / 3 ft. blanks: 38.5 laps / 1 yard x (blank) x (blank) x (blank) = (blank) miles i'm really confused on how to do this, and the explanations aren't exactly . if you could walk me through how to do this, it would be greatly appreciated.