Hi! i really need help with this question Solve each system of equation by using Gaussian elimination.

2x + 4y - z = -33

3x - 2y = 22

x + 3z = 17

Select the margin of error that corresponds to the sample mean that corresponds to each population: a population mean of 360, a standard deviation of 4, and a margin of error of 2.5%

Emily is entering a bicycle race for charity. her mother pledges $0.90 for every 0.75 mile she bikes. if emily bikes 18 miles, how much will her mother donate?

Solve for x: 5/3 x = 20/21 it's fraction. remember to simplify your fraction