the number of students in chess club decreased from 49 to 14.What is the percent decrease? Round the answer to the nearest percent

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

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

The length of a shadow of the building is 36m. the length of the pole, which is perpendicular to the ground, is 1.9m. the length of the pole's shadow is 1.52m. what is the height of the building?