Ben purchases a gallon of paint and some paintbrushes. Each paintbrush costs the same amount. The equation y = 6x + 30 models the total cost of Ben's purchases. What does the value of x = 0 represent in the situation?​

I'm so close to finishing all these.

In the sixth grade 13 out of 20 students have a dog if there are 152 sixth grade students how many of them have a dog

The distribution of a sample of the outside diameters of pvc pipes approximates a symmetrical, bell-shaped distribution. the arithmetic mean is 14.0 inches, and the standard deviation is 0.1 inches. about 68% of the outside diameters lie between what two amounts?