The sum of two numbers is -30. The difference of the two numbers is 18. What are the two numbers?

Can someone me i’m confused. will give brainliest and a whole bunch of points

Which of the statements about the graph of the function y = 2x are true? check all of the boxes that apply. the domain is all real numbers x because the exponent of 2 can be any real number when the x-values increases by 1 unit, the y-value multiplies by 2. the y-intercept is (0, 1). the graph never goes below the x-axis because powers of 2 are never negative. the range is all real numbers.

Can some one explain this i got sent this. is this a threat i’m scared