Your company has 50 employees and you are ordering custom printed t-shirts and travel mugs for everyone. The printing company offers you two packages. You can purchase 40 t-shirts and 10 travel mugs for $340 or 20 t-shirts and 30 travel mugs for $470. Write a system of
equations that could be used to determine the cost of each t-shirt and each travel mug (Don't solve, just write the system of equations.)
HELP M

How can you tell when x and y are not directly proportional?

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.

Anyone know these questions? i need ,.