Arestaurant has 6 pizza toppings to choose from. how many diffrent 3 topping pizzas are possible

Can someone me with my hwplz(only the circled ones)

An automobile assembly line operation has a scheduled mean completion time, μ, of 12 minutes. the standard deviation of completion times is 1.6 minutes. it is claimed that, under new management, the mean completion time has decreased. to test this claim, a random sample of 33 completion times under new management was taken. the sample had a mean of 11.2 minutes. assume that the population is normally distributed. can we support, at the 0.05 level of significance, the claim that the mean completion time has decreased under new management? assume that the standard deviation of completion times has not changed.

During a wright loss challenge your friend goes from 125 pounds to 100 pounds.what was the percent weight loss