Use the system of equations below to solve for z. 7x+3y+2z-4w=18
4w+5x-3y-2z=6
-2w-3x+y+z=-5
2z+3w+4y-8x=11

Ann and betty together have $60 ann has $9 more than twice betty’s amount how much money dose each have

How do you write a paragraph proof to prove that the corresponding angles shown are congruent

How many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.) how many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.)