Hello. It's the beginning of the school year, and I've quite forgotten what I learned in Pre-Algebra...The question in the text book is this :
Simplify each pair of expressions.
1. 36 - 8 ÷ 2
(36 - 8) ÷ 2
There are several problems like the one above. Under the same set of directions, though, some problems look like this :
7. 3(9+2) - 8
__________
7
With only one problem.
So, what am I supposed to do?
And, once that's answered, the next set of directions don't make sense to me either.
Evaluate each expression for a = 3, b= 7, c = 4.
13. a(2b-c)
?
Does evaluate just mean...Answer?
I believe that I understand the directions, now. Thank you though. It'd odd - Jiskha homework help used to work so much more quickly, in past years. I wonder what happened. Anyways, thanks again, and good luck with the other questions.
This is a holiday weekend and many of our tutors are on vacation. Also the new hurricane has driven at least one of them out of his home.
Under the first two, do the operations in the correct order: Parentheisis, multiply, divide, add subtrract.
So on the first
36 - 8 ÷ 2, do the divide first:
36-4 then the subtract.
This will be a quite a different answer from the second.
Yes, on the last, it means evaluate.
Alright. I apologize for my rudeness. Thank you.
15- n when n=9
Hello! In order to solve these problems, you need to follow the order of operations, also known as PEMDAS. PEMDAS stands for Parentheses, Exponents, Multiplication and Division (from left to right), and Addition and Subtraction (from left to right). Let's break down each problem you provided:
1. 36 - 8 ÷ 2
To solve this expression, we follow the order of operations. First, we perform the division: 8 ÷ 2 = 4. Then, we subtract 4 from 36: 36 - 4 = 32.
2. (36 - 8) ÷ 2
Similarly, we perform the subtraction in the parentheses first: 36 - 8 = 28. Then, we divide 28 by 2: 28 ÷ 2 = 14.
Based on the examples you provided, it seems like some problems have a fraction line with a single expression above and below, while others have multiple expressions. In the problem with a fraction line, you need to evaluate the expression above the line (numerator) first, and then divide the result by the expression below the line (denominator).
For example, in problem 7:
3(9+2) - 8
__________
7
To simplify this, you need to perform the arithmetic inside the parentheses first: 9 + 2 = 11. Then, multiply 3 by 11: 3(11) = 33. After that, subtract 8 from 33: 33 - 8 = 25. Finally, divide the result (25) by 7: 25 ÷ 7 = 3.57 (approximately).
Remember to always follow the order of operations and simplify each part of the expression before moving on to the next step.