Expand the following: 4(a + 3b - 5c). Please help, I'm really struggling with expanding equations

Find the x coordinate of the point.

The parabola x= √y-9 opens: a.)up b.)down c.)right d.)left

Assume that the weights of quarters are normally distributed with a mean of 5.67 g and a standard deviation 0.070 g. a vending machine will only accept coins weighing between 5.48 g and 5.82 g. what percentage of legal quarters will be rejected? round your answer to two decimal places.