When you start from a given set of rules and conditions and determine what must be true, you are using reasoning.

When you start from a given set of rules and conditions and determine what must be true, you are using  Deductive reasoning.

Deductive Reasoning--

In this logical process we start by taking a set of premises which are assumed to be true i.e. we start with a general set of information and reach to a certain or specific conclusion.

It is also known as: top-down logic.

It is opposite of inductive reasoning.

Example--

All dogs can bark.

Rocky is a dog.

Rocky can bark.

3x + 18 = 147°

step-by-step explanation:

3x + 18 = 147°, because the value of the central angle is equal to the value of the arc formed by it.

i hope i you.

total amount to be paid = $19.5

step-by-step explanation:

given ,

original price = $25.99

discount = 25%

discount amount = 25% of original price

discount amount = 25/100   * 25.99

discount amount = $6.49

hence , the total amount to be paid = original price - discount amount

                                                            = $25.99 - $6.49

                                                            =$19.5

total amount to be paid = $19.5