what is the value of the expression?

15-6/3.2+7-1

6/3.2 = 1.875

15 - 1.875 = 13.125
13.125 + 7 = 20.125
20.125 - 1 = 19.125

Answer = 19.125

or, if as josiah interpreted, 3.2 = 3•2, then, since multiplication/division are done left-to-right, we have

15-6/3.2+7-1
15-2•2+7-1
15-4+7-1
17

How important are parentheses!

To find the value of the expression 15 - 6/3.2 + 7 - 1, we will follow the order of operations, also known as PEMDAS:

1. Perform any calculations inside parentheses (none in this case).
2. Evaluate exponents (none in this case).
3. Perform multiplication and division from left to right.
4. Perform addition and subtraction from left to right.

Let's break down the calculation step by step:

Step 1: 6 divided by 3.2 equals 1.875.
The expression becomes:
15 - 1.875 + 7 - 1

Step 2: Perform addition and subtraction from left to right.
15 - 1.875 equals 13.125.
13.125 + 7 equals 20.125.
20.125 - 1 equals 19.125.

Therefore, the value of the expression 15 - 6/3.2 + 7 - 1 is 19.125.

I got 20 because you have to PEMDAS which is Parentheses Exponents Multiplacation Division Addition Subtraction. 15-6/3.2+7-1 First you have multiply 3 & 2 and you get 6. then you divide 6 by 6 and get 1. Then you minus 1 from 15 that equals 14 because you have to add and subtract from left to right. Then 14 + 7 = 21-1=20