Please help with geometry! #9!!

Which expression gives the area of the triangle shown below

Explain how you can use the associative property to evaluate (7x50)x4.

Asunflower was 20 1/2 inches tall. over the next 6 months, it grew to a height of 37 inches tall. what was the average yearly growth rate of the height of the plzzz write a proportion i will give you 100 points