‼️PLEASE HELP I HAVE NO IDEA ON HOW TO DO THIS AND I DONT HAVE MUCH TIME TO DO IT‼️‼️ Solve each system by elimination. Please show the work.

1. 3x+3y+6z=9; 2x+y+3z=7; x+2y-z=-10

2. 3x-y+z=3; x+y+2z=4; x+2y+z=4

3. x-2y+3z=12; 2x-y-2z=5; 2x+2y-z=4

What is the solution set of the quadratic inequality x^2-5< or equal to 0

Thales was an ancient philosopher familiar with similar triangles. one story about him says that he found the height of a pyramid by measuring its shadow and his own shadow at the same time. if the person is 5-ft tall, what is the height of the pyramid in the drawing?

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?