Answer:
28. a) [tex]-7.3 + 7.4[/tex]
29. c) [tex]3n + 0.18[/tex]
Step-by-step explanation:
Question 28:
Given:
The equation is -9.6 + 9.5 + _________ = 0
In order to solve this, first let us simplify the terms -9.6 + 9.5.
-9.6 + 9.5 = -0.1
So, we are getting the sum of first 2 numbers as -0.1. Now, the result is 0. So, we know that, -a + a = 0. Therefore, the number that should come in the blanks should be -(-0.1) = 0.1
Now, among all the 4 choices, only choice (a) gives the sum as 0.1 as shown below:
-7.3 + 7.4 = 0.1
The options (b) and (c) has a result of 0 and option (d) sum is -0.1.
Therefore, the correct option is option (a).
Question 29:
Given:
The expression to simplify is given as:
[tex]2n+n+0.18[/tex]
Using commutative property of addition, we add the like terms together. Here, the like terms are [tex]2n\ and\ n[/tex]. So, we add them as shown below:
[tex]2n+1n=(2+1)n=3n[/tex]
Therefore, the given expression is simplified to [tex]3n + 0.18[/tex]. Hence, the correct option is option (c).
