Consider the following work breakdown structure: duration estimates (days) activity precedes optimistic most likely pessimistic start u, v - - - u w 35 50 65 v w, x 28 40 52 w z 26 35 44 x y 28 40 52 y z 26 29 38 z end 36 60 84 what is the estimated standard deviation in the time for activity z? 4 days 2 days 3 days 5 days 8 days

that is the sum

step-by-step explanation:

there are no other answers without knowing the variables values

b) k’(6, 4); l’(3, 3)

step-by-step explanation:

a 270° clockwise rotation maps every point (x, y) to (y, -x). (it negates the x-coordinate and then switches it and the y-coordinate.)

this means the endpoints of the side congruent to kl, k' and l', would be mapped as:

k'(-4, 6)→(6, 4)

l'(-3, 3)→(3, 3)

a≈380.13mi² would be your answer if the radius was 11 miles