Proof of Identities and equalities. Determine for what values of x and y is the following equality always true? Will give 100 points

x^2+y^2=(k-2)x-2ky-k-4=0,

Multiply. write your answer in simplest form. 3/8 x 5/7

If, while training for a marathon, you ran 60 miles in 2/3 months, how many miles did you run each month? (assume you ran the same amount each month) write your answer as a whole number, proper fraction, or mixed number in simplest form. you ran __ miles each month.

A3-dimensional figure has a square base and 4 lateral faces that meet at a point. explain the difference between the cross sections when a slice is made perpendicular to the base through the vertex, and when a slice is made perpendicular to the base and not through the vertex