1.25%
2.0%
3.100%
4.50%

b would be the right answer

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

: -)

if you know your abc's you should be able to get your answer or just use google

the growth of the plants is affected by the heat of the light. what is the student doing?