6.80-(24-6) 90-(36-8) 48 + (13 + 7) 34 + (18 + 2) 89-(64-4) 75-(37-7)

Let's solve each expression step-by-step.

1. First Expression: \(6.80 - (24 - 6)\)

   • Calculate the parentheses first: \(24 - 6 = 18\)
   • Now substitute this back in: \(6.80 - 18 = -11.20\)

2. Second Expression: \(90 - (36 - 8)\)

   • Calculate the parentheses first: \(36 - 8 = 28\)
   • Now substitute this back in: \(90 - 28 = 62\)

Now we have the results for the first two expressions:

• \(6.80 - (24 - 6) = -11.20\)
• \(90 - (36 - 8) = 62\)

Next, let's move to the third expression:

3. Third Expression: \(48 + (13 + 7)\)

   • Calculate the parentheses first: \(13 + 7 = 20\)
   • Now substitute this back in: \(48 + 20 = 68\)

4. Fourth Expression: \(34 + (18 + 2)\)

   • Calculate the parentheses first: \(18 + 2 = 20\)
   • Now substitute this back in: \(34 + 20 = 54\)

Now we have the results for the next two expressions:

• \(48 + (13 + 7) = 68\)
• \(34 + (18 + 2) = 54\)

Now let's solve the last two expressions:

5. Fifth Expression: \(89 - (64 - 4)\)

   • Calculate the parentheses first: \(64 - 4 = 60\)
   • Now substitute this back in: \(89 - 60 = 29\)

6. Sixth Expression: \(75 - (37 - 7)\)

   • Calculate the parentheses first: \(37 - 7 = 30\)
   • Now substitute this back in: \(75 - 30 = 45\)

Now we have the results for the last two expressions:

• \(89 - (64 - 4) = 29\)
• \(75 - (37 - 7) = 45\)

To summarize all the results:

• \(6.80 - (24 - 6) = -11.20\)
• \(90 - (36 - 8) = 62\)
• \(48 + (13 + 7) = 68\)
• \(34 + (18 + 2) = 54\)
• \(89 - (64 - 4) = 29\)
• \(75 - (37 - 7) = 45\)