I'm giving away my points and helping increases your chance of getting points

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

Write an algebraic expression to match each statement a. four less than 8 times a number b. twice the difference of a number and six c. nine from a number squared

Asurvey of 2,000 doctors showed that an average of 3 out of 5 doctors use brand x aspirin. how many doctors use brand x aspirin