Find the opposite of the opposite of the integer -7

An angle that measures between 90 and 180° is called a(,

Parabolas y=−2x^2 and y=2x^2 +k intersect at points a and b that are in the third and the fourth quadrants respectively. find k if length of the segment ab is 5.

What are the domain and range of the function f(x)=2^x+1