Let x1~ exp(1) and x2 ~ exp(1) be independent and identically-distributed exponential random variables with rate 1.

let: y = x1 + x2 , z = x1 − x2

(a) what is the cdf of x1?

(b) what is the joint pdf of (x1, x2)?

(c) what is the joint pdf of (y, z)?

(d) what is the marginal pdf of z?

What is the measure of sty in oo below? 130 310 230 50

Afunction, f(x), represents the height of a plant x months after being planted. students measure and record the height on a monthly basis. select the appropriate domain for this situation. a. the set of all positive real numbers b. the set of all integers oc. the set of all positive integers od. the set of all real numbers reset next

Given sin28.4=.4756, cos28.4=.8796, and tan28.4=.5407 find the cot of 61.6