Please solve all the maths, please

To ? nd out how many students are unhappy with the dining hall food, you distribute a survey. which method of surveying would produce the least amount of bias in your data?

Ajar contains a mixture of 20 black marbles, 16 red marbles, and 4 white marbles, all the same size. find the probability of drawing a white or red marble on the first draw. 125 12 01 next question ask for turn it in

Explain how you can use the associative property to evaluate (7x50)x4.