50 POINTS PLEASE HELP THIS IS MY LAST QUESTION ON MY ALGEBRA 2 FINAL IF YOU ARE GOOD AT POLYNOMIAL FUNCTIONS PLEASE HELP

Liz had 140 pens and inna had 100 pens. after inna gave liz some pens, liz had 3 times as many pens as inna. how many pens did inna give liz?

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.

2. explain in words how you plot the point (4, −2) in a rectangular coordinate system.