What is the opposite of
A) 7 & B) -3

A -7 , -3
B -7 -3
C -7 , 3
D 7 , 3

In the equation sqrt(n+5)-sqrt(11-10)=1. what is the value of n

What are the solutions for the following system? -2x^2+y=-5 y=-3x^2+5

Given right triangle a w/a hypotenuse length of x+4 and a leg of x, and right triangle b, w/ a hypotense length of 3y and a leg length of y+4 for what values of x and y are the triangles congruent by hl?