Final answer:
The missing term in '-18a + 3 - 6a' is '-24a + 3' after combining like terms. For '-19a - 17 + 3', the expression simplifies to '-19a - 14'. No fractions were present to simplify.
Step-by-step explanation:
Simplifying Algebraic Expressions
To fill in the missing term, we follow algebraic operations and simplify the expression. Starting with -18a + 3 - 6a, we combine like terms by adding the 'a' terms together and leaving the constants as is. This results in: -18a - 6a + 3 = -24a + 3.Next, we observe the equation -19a - 17 + 3. We combine the constants -17 and +3 to get -14, which simplifies the equation to -19a - 14.
To simplify fractions, if any are present, we would look for the greatest common factor between the numerator and the denominator and divide both by it to obtain the simplest form. However, in this example, no fractions were provided to simplify. Lastly, it is important to eliminate terms whenever possible to simplify algebra and check the answer to ensure it is reasonable.