2.64 gallons = how many liters

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

Im gonna fail 7th grade selective breeding 1. creates offspring which are genetically identical to the parent 2. is the process of breeding only organisms with desirable traits 3. involves the removal of the nucleus of a cell 4. combines traits from organisms of different species