Hiii please help i’ll give brainliest if you answer correctly

I believe the answer is the first option.

Step-by-step explanation:

To set off material for additional emphasis.

hope this helps and is right :)

A

Step-by-step explanation:

The dash (–) is used to set off additional material within a sentence, often in order to emphasize it, to set off appositives that contain commas, or to indicate missing words. ... Some word-processing programs have a mark called an em-dash (longer than a hyphen), which can be used with no space before or after it.

b

step-by-step explanation:

calculate the scale factor as the ratio of corresponding sides, image to original, that is

scale factor = = = = 1

step-by-step explanation:

1. practice, practice & more practice

2. review errors

3. master the key concepts

do not try to memorise the processes.

4. understand your doubts.

5. create a distraction free study environment

6. create a mathematical dictionary

7. apply maths to real world problems.