Solve the system of equations

x-y + 9z = -27
2x – 4y - z= -1
3x + 6y - 3z = 27

Last year, a state university received 3,560 applications from boys. of those applications, 35 percent were from boys who lived in other states. part a)how many applications did the university receive from boys who lived in other states? part b)applications to the university from boys represented 40percent of all applications. how many applications did the university receive in all? i don't how to do part b so me and plz tell how you got your answer

Whats are the trickiest steps to do when adding or subtracting rational expressions? how does knowledge of rational numbers u in adding and subtracting rational expressions?

During a wright loss challenge your friend goes from 125 pounds to 100 pounds. what was the percent weight loss