Greatest common factor
faceor each and find common groups
18a=2 times 3 times 3 times a
20ab=2 times 2 times 5 times a tmes b
6ab=2 times 3 times a times b
common group is
2 times a
answe ris 2a
The central angle below is 1
Take how much was added, divide by how much you originally had. 100-80=20. 20/80= 25%

When variables with exponents are divided by each other, you subtract the exponents.
For example:


Answer:
2.06
Step-by-step explanation:
3x102=306
6×105=630
630 ÷ 306 = 2.0588235294
round it to 2.06