What is the determinant of the coefficient matrix of the system? 4x-6y+0z=-7
3x+3y+0z=-2
2x-12y+0z=-1

Prove that the sum of two consecutive exponents of the number 5 is divisible by 30.if two consecutive exponents are 5n and 5n + 1, then their sum can be written as 30.

Asquare and an equilateral triangle have the same perimeter. each side the triangle is 4 inches longer than each side of the square. what is the perimeter of the square

Plzzz answer both questions and i will give you 100 points