Identify the relationship then solve for x

Write a story that matches with the expression 42x-5 pls hurry

You have 138.72 in your saving account u take out 45.23 and 18.00 you deposit 75.85 into your account

From the top of a tree a bird looks down on a field mouse at an angle of depression of 50°. if the field mouse is 40 meters from the base of the tree, find the vertical distance from the ground to the bird's eyes.