Simplifyng algebraic expressions

-2z-3w+7+8 use z=3 and w=9

  best answer for the question.1.     divide  7/24  by  35/48  and reduce the quotient to the lowest fraction. 

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

If two angles of a triangle have equal measures and the third angle measures 90°, what are the angle measures of the triangle? a. 60°, 60°, 60° b. 45°, 90°, 90° c. 30°, 30°, 90° d. 45°, 45°, 90°