Use photomath
hope this helps
2.25m + 2(2.25m) + 90 cm =
2.25m + 4.50m + 90 cm
6.75m + 90 cm
1 cm = 0.01m...so 90 cm = 90 * 0.01 = 0.9m
6.75m + 0.9m = 7.65m <===
OR..
1m = 100 cm....so 7.65m = 7.65 * 100 = 765 cm <===
5,7,8 they all equal 21, 21 divided by 3 is 7
For possible roots I got...
1
1/3
5
5/3
Not really sure about a b c or d.
x = -0.76508126
gbgb,ggbb,bgbg,bbgg,bggb,gbbg. I'm guessing 6 due to the fact the question lacks detail on who exactly is going.