how much pure alchohol must a nurse add to 10cm of a 60% alchohol solution to streghen it to a 90% solution pls pls pls

Someone me! if you’re smart you can solve this!

What is the measure of sty in oo below? 130 310 230 50

Which description is represented by a discrete graph? kiley bought a platter for $19 and several matching bowls that were $8 each. what is the total cost before tax? the temperature at 9 a.m. was 83° f and is heating up at an average rate of 6°f per hour. what is the temperature x hours later? juan ate an egg with 78 calories and some cereal with 110 calories per serving for breakfast. what is the total amount of calories he consumed? a bottle contained 2,000 ml of liquid and is being poured out at an average rate of 300 ml per second. how much liquid is left in the bottle after x seconds?