Which of the following statements are true? 1. the difference between -1.4 and -8.3 is positive.2. -1.4 + 8 3 has the same value as the difference between -1.4 and -8.3.3. the between -8.3 and -1.4 has the same value as the difference between -1.4 and -8.3.a. 1 onlyb. 1 and 2c. all the statements are true. d. none of the systems are true.

Is there a direction u in which the rate of change of f(x,y)equals=x squared minus 3 xy plus 4 y squaredx2−3xy+4y2 at p(1,2) equals 14? give reasons for your answer. choose the correct answer below. a. no. the given rate of change is smaller than the minimum rate of change. b. no. the given rate of change is larger than the maximum rate of change. c. yes. the given rate of change is larger than the minimum rate of change and smaller than the maximum rate of change.

Y+ 2/y is it a polynomial in one variable or not? and if so, why?

Random variables x poisson~ ( a) ,y poisson ~ ( a) . x and y are independent. if 2 1, 2 1. u =2x+ y-1, v=2x- y +1. find: ) cov (u ,v ).