URGENT PLEASE HELP HW DUE!!

What is the y-intercept of the graph of the equation y=3(2^x)

Tell whether the two rates form a proportion

An unknown number x is at most 10. which graph best represents all the values of x? number line graph with closed circle on 10 and shading to the right. number line graph with open circle on 10 and shading to the right. number line graph with open circle on 10 and shading to the left. number line graph with closed circle on 10 and shading to the left.