Solve for proportion

8/13= v/21

please and thanks :)

Triangle inequality theorem state if each set of three numbers can be the lengths of the sides of a triangle. 1. 9, 8, 22. 2. 5,10,12. 3. 7,10,22. 4. 4,11,12. 5. 11,9,10. 6. 10,4,19. 7. 3,12,10. 8. 4,3,2. 9. 6,5,13. 10. 7,12,20. me .

Solve this equation using substitution. {4x + y = −2} {4x + 6y = 44}

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base