I am a little lost with these two problems can anyone help?

Which functions are even? check all of the boxes that apply. f(x) = x4 – x? f(x) = x2 – 3x + 2 f(x) = (x - 2) f(x) = x done

Solve 2x2 + 8 = 0 by graphing the related function. there are two solutions: . there are no real number solutions. there are two solutions: 2 and -2

Afew weeks ago, vera bought 5 apples from her local farmers' market. today, she bought 4 apples. what is the percent of decrease in the number of apples bought?