Evaluate the expression: v ⋅ w

given the vectors:
r = < 5, -5, -2> ;
v = < 2, -8, -8> ;
w = < -2, 6, -5>

Use the elimination method to solve the systems of equations.choose the correct ordered pair. 7x+4y=39

An office supply company conducted a survey before marketing a new paper shredder designed for home use. in the survey, 80 % of the people who tried the shredder were satisfied with it. because of this high satisfaction rate, the company decided to market the new shredder. assume that 80 % of all people are satisfied with this shredder. during a certain month, 100 customers bought this shredder. find the probability that of these 100 customers, the number who are satisfied is 69 or fewer.

y=2x−1 5x−4y=1 is (1,1)(1,1) a solution of the system?