May someone please help I really need to get this right

And employee salary increased by $4500 which represents a 15% raise what is the rate of the increase

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

How can (square root of 25) ^2 be rewritten?