Variables in php must begin with what symbol?
select one:
a. ?
b. $
c. &
d.

Which demographic challenge is europe currently experiencing? a. an aging and decreasing population b. a baby boomc. an unequal distribution between males and females d. a large group of teenagers moving through the school system(i chose a but i'm unsure)

Which explains extrinsic motivation? a)motivation in which there is a reward b)motivation that is personally satisfying c)motivation that is personally meaningful d)motivation in which the subject is interesting

Write a program that reads a set of floating-point values. ask the user to enter the values, then print • the average of the values. • the smallest of the values. • the largest of the values. • the range, that is the difference between the smallest and largest. of course, you may only prompt for the values once.