# Tutor profile: Nghi N.

## Questions

### Subject: Pre-Algebra

8 + 10 x (5 - 3) = ?

PEMDAS is our friend. We just need to follow: Parenthesis, Exponential, Multiplication/Division, Addition/Subtraction from left to right We have (5-3) in parenthesis so we will do that first: (5-3) = 2 Then it becomes: 8 + 10 x 2 Then it's multiplication/division, since there is no division, we simply multiply first: 10 x 2 = 20 Then it becomes: 8 + 20 = 28. It's not hard! :) We just need to take it step by step then we'll get the answer in no time!

### Subject: Basic Math

15 x 2 = A x 10. Find A.

Let's do one side at a time: Starting with left: 15 x 2 = 30 Right side: A x 10 = 10A or A10 (usually, the "known number goes first," followed by a variable, in this case it becomes 10A). So put it all together, we have: 30 = 10A To get rid of the 10 and find A, we need to divided both sides by 10: 30 / 10 = 10A / 10 3 = A We have the final answer! A= 10. It's easier than it looks :)

### Subject: Algebra

The sum of 4 times a number and 9 more than 5 times that same number is equal to 108. Find that number.

We need to break down the questions as follow: Let's call the unknown number A. 4 times a number MEANS 4 x A 9 more than 5 times that same number MEANS 5 x A - 9 is equal to 108 = 108 Putting it all together, we have (4 x A) + (5 x A + 9) = 108 Using PEMDAS (Parenthesis, Exponential, Multiplication/Division, Addition/Subtraction) we get: 4 x A + 5 x A + 9 = 108 Then Multiplication/Division next 4A + 5A +9 = 108 9A+9=108 Then we move all the "like-term" to one side and leave all the variable on another side: 9A = 108 - 9 (notice how we subtract the 9 on this side) 9A = 99 Then we divided both sides by 9 to get A: A = 11