3 * 4 = 12
12 * 4 = 48
48 * 4 = 192
192 * 4 = 768
The next number in the sequence is the previous number multiplied by 4:
The next number would be 768 x 4 = 3072
She orders 5 pair in 5 different sizes:
5 x 5 = 25 pair
She orders 3 pair in 3 different sizes:
3 x 3 = 9 pair
Total pairs = 25 + 9 = 34 pair.
I'd do 9x4=36 because the 9 is from your money and the 4 is from your books. Now since you want to find out how much 4 books cost you just multiply that by 9
I think you can the is an app that can help with graphing its called desmos
