Find the unknown angle x.

The depth of a lake at a certain point, wich is a function of the distance of that point from shore, is 30 feet.

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

The lengths of two sides of a right triangle are given. find the length of the third side. round to the nearest tenth if necessary. a) y = 12/5x + 39/5 b) y = 5/12x + 5/39 c) y = 12/5x - 39/5 d) y = 5/12x - 5/39