The mean of four numbers is 15 and the mean of three of these numbers is 18. Find the fourth
number.​

Asystem of equation is shown below 6x - 2y equals 3 . and 5x + 3y equals 4. would you solve by substitution or elimination? and why

Which of the points a(6, 2), b(0, 0), c(3, 2), d(−12, 8), e(−12, −8) belong to the graph of direct variation y= 2/3 x?

What is the value of f(x) = 2.2 for f(-2)?