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Chapter 1: Q12. (page 48)

Find the value of each expression

12. 21-9-2÷2

Short Answer

Expert verified

Expression 21-9-2÷2 results into 7.

Step by step solution

01

- Order for simplification 

To evaluate any expression involving more than one operation, follow the below order of operations:

  • First evaluate expressions inside grouping symbols like parentheses ( ) or brackets [ ].
  • Evaluate the exponents.
  • Perform Multiplication and division from left to right.
  • Perform addition and subtraction from left to right.
02

- Simplify grouping expression

To evaluate given expression, first simplify parentheses and then bracket as shown below:

21−9−2÷2=21−7÷2=14÷2

03

– Divide 14 by 2

To simplify further, divide the terms from left to right.

14÷2=7

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FIREWORKS

Suppose you are about a mile from a firework display. You count 5 seconds between seeing the light and hearing the sound of the firework display. You estimate the viewing angle is about 4°. Using the information at the left, estimate the width of the firework display.

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