4 easy questions that i dont know please

Which expression gives the area of the triangle shown below

Justin has 750 more than eva and eva has 12 less than justin together they have a total of 63 how much money did

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.