PLEASE HELP IN ALGEBRA, LAST QUESTION!!

5,600 x 10^3 = a) 560 b) 5,000,600 c) 5,600,000 d) 56,000

Tell whether the two rates form a proportion

Using the figure below, select the two pairs of alternate interior angles. a: point 1 and point 4 b : point 2 and point 3 c: point 6 and point 6d: point 5 and point 7