What's the value of 18+-9

Find the average rate of change for f(x) = x2 − 3x − 10 from x = −5 to x = 10.

Pat listed all the numbers that have 15 as a multiple write the numbers in pats list

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).