Yall help this is my pass or fail end of year quiz please show your work

Can someone check if i did this correct. it’s number 4 if you’re wondering.

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?

Write the summation to estimate the area under the curve y = 1 + x2 from x = -1 to x = 2 using 3 rectangles and right endpoints