Can a variable squared be combined with a variable

Suppose your sat score is 2040. a college with an average sat score for admintted students of which of these would most likely be your best option?

What rule describes a dilation with a scale factor of 4 and the center of dilation at the origin?

The discrete random variables x and y take integer values with joint probability distribution given by f (x, y) = a(y−x+1) 0 ≤ x ≤ y ≤ 2 or =0 otherwise, where a is a constant. 1 tabulate the distribution and show that a = 0.1.2 find the marginal distributions of x and y. 3 calculate cov(x, y).4 state, giving a reason, whether x and y are independent. 5 calculate e(y|x = 1).