If triangle ABC is a right triangle AB is 21, BC is 42, and AC is 47, which of the following can be used to find the measure of Angle A? Select all that apply. look at pic below for answer options:

Need 50 will mark brainliest answer. find the lengths of all the sides and the measures of the angles.

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?

What is the range of the function? f(x)=-2|x+1|? a. all real numbers. b. all real numbers less than or equal to 0. c. all real numbers less than or equal to 1. d. all real numbers greater than or equal to 1