There are 20 students in mark's homeroom class. ten percent of the students in mark's homeroom class are also in art class. he finds the number of students in his homeroom class who are also in art class like this:
explain mark's error. then find the correct solution to the problem. show your work. ( answer)

Plz determine whether the polynomial is a difference of squares and if it is, factor it. y2 – 196 is a difference of squares: (y + 14)2 is a difference of squares: (y – 14)2 is a difference of squares: (y + 14)(y – 14) is not a difference of squares

An initial investment of $100 is now valued at $150. the annual interest rate is 5%, compounded continuously. the equation 100e0.05t = 150 represents the situation, where t is the number of years the money has been invested. about how long has the money been invested? use your calculator and round to the nearest whole number. years

Xy x xy if a and b are positive integers such that a*b=9 and b*a=72 what is the value of a/b