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svp [43]
3 years ago
12

Determine whether the number is divisible by 3. Give a reason based on the tests for divisibility

Mathematics
1 answer:
hoa [83]3 years ago
8 0

Answer:

No

Step-by-step explanation:

A little trick to easily see if things are divisible by 3 is to add the 2 numbers together.

For example with 71 if you add 7+1 you get 8. 8 is not divisible by 3.

However if you were looking at 81 you add 8+1 to get 9. 3×3=9 so 81 is divisible by 3.

By putting that into a calculator you can see that 81/3=27 and 71/3=23.6666...

Hope that helped!

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3 years ago
Without calculating, how do you know that the equation |4x - 71 = -1 has no solution?
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Answer:

See Explanation

Step-by-step explanation:

Given

|4x - 7| = -1

Required:

How do you know, it has no solution

The expression on the left-hand side is an absolute function and the result is always positive.

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The negative sign is on the contrary to what an absolute value represent.

<em></em>

<em>Hence, it has no solution.</em>

5 0
3 years ago
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Answer:

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