On tuesday, wendy and her friend purchased 3 sandwiches and 2 drink for $15.75. on friday, wendy purchased 2 sandwiches and 1 drink at the same restaurant for $9.85. how much does one sandwich cost?

If 3x+8=3x+8 is it one solution or no solution

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.

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