Someone help me with this please

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 two point-slope equations for the line passing through the points (6, 5) and (3, 1)

List x1, x2, x3, x4 where xi is the left endpoint of the four equal intervals used to estimate the area under the curve of f(x) between x = 4 and x = 6. a 4, 4.5, 5, 5.5 b 4.5, 5, 5.5, 6 c 4.25, 4.75, 5.25, 5.75 d 4, 4.2, 5.4, 6