Slope of (-3,6), (2,6)

Which is an equation for the nth terms of the sequence 12,15,18,21

Brent needs to paint a logo made using two right triangles. the dimensions of the logo are shown below. what is the difference between the area of the large triangle and the area of the small triangle? (1 point) select one: a. 4.5 cm2 b. 8.5 cm2 c. 16.5 cm2 d. 33.0 cm2

Me. i can't figure out this question. give an explanation too. .