i spent 22 dollars on school supplies and the pencil box cost 2 dollars less than the notebook and the pens cost 3 times more than the pencils find a variable and describe it and for a algebraic equation and solve it

What is the maximum of the sinusoidal function

X=4 / y=100 if x=10 then what is y=?

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).