7.1 and 7.5 because any integer is a rational number
X = -15 because first u move the ax’s to one side so it would be 3x-5x=25+5 then u calculate each side 3x-5x= -2x and 25+5=30 so -2x=30 and then u divide both sides by -2 and -2/-2 cancels out and 30/-2 equals -15 (I hope his helps) :))
I think you mean what's the name of it,
they are called ordered points.
The answer is c 109 degrees