Find the magnitude of the vector from the origin to (-7,5) and write the vector as the sum of unit vectors.

When can u say there is no solution for a system of linear inequalities? explain your answer and show with a system and graph

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.

Three numbers x, y, and z are in the ratio 2: 7: 8. if 12 is subtracted from y, then three numbers form a geometric sequence (in the order x, y–12, z). find x, y, and z. there are 2 sets.