Factor this polynomial using the gcf: 21x - 14 x(21 - 14) 7(3x - 1) 21x(1 - 14) 7(3x - 2)

Can someone me with this problem i don't understand i need

Haruka hiked several kilometers in the morning. she hiked only 66 kilometers in the afternoon, which was 25% less than she had hiked in the morning. how many kilometers did haruka hike in all?

Піf x = y and y= z, which statement must be true? оа. -x = -2 b. x= z ос. —x = 2 od. 2= x