Chris is a college student who can work a maximum of 40 hours per week. he needs to make at least $900 in order to cover his expenses. his tutoring job pays $25 per hour and he also makes $15 per hour refereeing soccer matches. find the constraints for this situation and determine which point is a valid solution to the system, where x is the number of hours chris spends tutoring and y is the number of hours he spends refereeing.

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.

Find the area of a parallelogram with base 15 yards and height 21 2/3

Mr. thompson is on a diet. he currently weighs 260 pounds. he loses 4 pounds per month. what part of the story makes the relationship not proportional?