https://r2.erweima.ai/mathbot/image/17256406281058x7broh7.jpg

Let's solve the two questions from the image.

### Question 4:
\[
\frac{-12}{2 - (-1)} = ?
\]

First, simplify the denominator:
\[
2 - (-1) = 2 + 1 = 3
\]

Now divide:
\[
\frac{-12}{3} = -4
\]

So, the correct answer is **-4**.

### Question 5:
\[
1 + \sqrt{9 + 16} = ?
\]

First, simplify inside the square root:
\[
9 + 16 = 25
\]

Now take the square root of 25:
\[
\sqrt{25} = 5
\]

Finally, add:
\[
1 + 5 = 6
\]

So, the correct answer is **6**.

Would you like further details or clarification on these problems?

### Related questions:
1. What happens if the denominator in Question 4 had been zero?
2. How would the solution to Question 5 change if the expression under the square root was negative?
3. How do you handle square roots of non-perfect squares?
4. What is the difference between addition and subtraction of negative numbers?
5. How would Question 4 change if both terms in the denominator had been squared?

### Tip:
Always simplify the denominator first when dealing with fractions to avoid errors in the final calculation!

Solve the following mathematical problems:
1. (-12) / (2 - (-1))
2. 1 + √(9 + 16)

Learn how to solve a problem involving the simplification of fractions and the addition of square roots. This math tutorial covers basic arithmetic and square root calculations, suitable for students in Grades 6-8.

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