To solve the given math problems, we need to perform basic arithmetic operations. The first problem involves division of two negative numbers, and the second problem involves division of a positive number by a negative number.
For the first problem, divide \(-28\) by \(-4\). When dividing two negative numbers, the result is positive.
For the second problem, divide \(16\) by \(-2\). When dividing a positive number by a negative number, the result is negative.
Step 1: Solve \(\frac{-28}{-4}\)
To solve the expression \(\frac{-28}{-4}\), we divide \(-28\) by \(-4\):
\[
\frac{-28}{-4} = 7.0
\]
Step 2: Solve \(16 \div (-2)\)
Next, we solve the expression \(16 \div (-2)\):
\[
16 \div (-2) = -8.0
\]
Final Answer
The results of the calculations are:
\[
\frac{-28}{-4} = 7.0 \quad \text{and} \quad 16 \div (-2) = -8.0
\]
Thus, the final answers are:
\[
\boxed{7.0} \quad \text{and} \quad \boxed{-8.0}
\]