−2.8+2.4+7.8−2.8

I dont know how to solve this expression

What is the volume of the sphere shown below with a radius of 3?

If jaime wants to find 60% of 320, which table should he use?

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