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28. a)

29. c)

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:

Using commutative property of addition, we add the like terms together. Here, the like terms are . So, we add them as shown below:

Therefore, the given expression is simplified to . Hence, the correct option is option (c).

rx and sx

step-by-step explanation:

is means division by fractions

step-by-step explanation: