# Tutor profile: Savannah A.

## Questions

### Subject: Linear Algebra

How do I solve for y in a linear equation when given x?

You will begin by substituting your given X value into the equation and solving. In the event we are given y= 5x+3 with X = 2, we will substitute X in: y= 5(2) +3 Using the rules of PEMDAS, this can be simplified to: y= 10 + 3 We can simplify additional solving for the following answer: y=13

### Subject: Basic Math

How to divide fractions?

If you have a problem that is asking you to divide two fractions, you will use the three simple steps: Keep, Change, Flip. You are going to keep your first fraction the same, change the division sign to a multiplication sign, and flip the last fraction so the numerator (number on top) becomes the denominator (number on bottom) , and the denominator becomes the numerator.

### Subject: Statistics

What is a z-score?

A z-score can be computed using the formula: (X - mean)/ standard deviation Essentially, the value computed when applying the data given into this formula is a measure of the number of standard deviation above/below the mean the data spans across. When Using a Z-table to find the corresponding value from the computed Z-score, it is demonstrating the percentage of the area of the bell-curve being expressed to the left of the X value (or 1- z-score value for the area to the right)