Find dx/dy by implicit differentiation x^2=x+y/x−y

Tamera puts 15/4 gallons of gasoline in her car. which mixed number represents the gallons of gasoline? a) 2 3/4 gallons b) 3 1/4 gallons c) 3 3/4 gallons d) 4 1/2 gallons answer it's worth a lot of points!

Evaluate the expression for the given value of the variable 7a - 4a for a =8

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?