Question

PLEASE HELP ASAP!!!!!

Answer 1

For this case what we must do is use the law of cosines.
 We then have the following equation:
 $c ^ 2 = a ^ 2 + b ^ 2 - 2 * a * b * cos (x)$
 Where,
 a, b: sides of the triangle
 x: angle between sides a and b.
 Substituting values we have:
 $c^2 = 90^2 + 75^2 - 2*90*75*cos(85)$
 Clearing the value of c we have:
 $c = \sqrt{ 90^2 + 75^2 - 2*90*75*cos(85)}$
 Answer:
 An expression that is equivalent to how many feet the oak trees are from each other is:
 $c = \sqrt{ 90^2 + 75^2 - 2*90*75*cos(85)}$