The system of three linear equations in three variables below is to be solved using technology with matrices. 2x + z = 5y - 17.75
4x - 3y = 5z + 8.25
8x + 2z = y + 2z + 6.5
Which matrices could be used to solve the system of equations?
Pls answer quickly!

5x + 2 = 12 solve the following equation. then place the correct number in the box provided.

Haley buys 9 pounds of apples for $3. how many pounds of apples can she buy for $1?

Apsychology student wishes to investigate differences in political opinions between business majors and political science majors at her college. she randomly selects 100 students from the 260 business majors and 100 students from the 180 political science majors. does this sampling plan result in a simple random sample? why or why not? no, because each group of 200 students in the sample does not have the same chance of being selected. yes, because each group of 200 students in the sample has the same chance of being selected. no, because each individual student does not have an equal chance of being selected. yes, because each individual student has the same chance of being selected.