In a mix of red and white pebbles in a bag in the ratio of 3 to 7. find the probability that if 3 pebbles are chosen from the mixture at least one is white

What is the average rate of change for this function for the interval from x=2 to x=4 ?

Student price tickets to a movie are $1 and non student tickets are $2 . 350 tickets are sold and the total amount made is $450. there were 250 student tickets sold . true or false .

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.