Solve for x, given the equation 2 square root of x+3-4=-8

Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.

In the sixth grade 13 out of 20 students have a dog if there are 152 sixth grade students how many of them have a dog

Jayne is studying urban planning and finds that her town is decreasing in population by 3% each year. the population of her town is changing by a constant rate. true or false?