The average price of a printer in 2015 is $200. The average price in 2019 is $78, Find the percent of change

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?

Does anyone know how to solve and graph this: 4 + | a + 2 | < 7the only part i don't get is the "4 +"

Find the solution(s) to x^2-14+49=0