Answer:
5:6
Step-by-step explanation:
2x + y = 20 . y=3x
2x + 3x = 20
5x = 20
x/5 = 20/5
x = 4
(4,0)
Mary has the better deal
Jennifer's $1.35 * 12 = $16.20
Mary's 12 flowers = $15.96
70.91 x 10 = 709.1
70.91 x 100 = 7,091
70.91 x 1000 = 70,910