Anumber consists of two digits whose sum is equal to eight times the number formed by interchanging the digits, find the number

7. if the value of x varies directly with the value of y, and x = 3 when y = 21. what is the valu y, and x = 3 when y = 21. what is the value of x when y = 105?

Prove that quadrilateral is a rhombus.

Factor the polynomial, if possible. if the polynomial cannot be factored, write prime. 9n^3 + 27n^2 – 25n – 75