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Bingel [31]
3 years ago
6

Solve z ÷ (–7) = –1. A. 7 B. -7 C. 1/7 D. 6

Mathematics
2 answers:
VMariaS [17]3 years ago
7 0

Answer:

Z=+7

Step-by-step explanation:

To solve this question

Z÷(-7)=-1

For clear understanding

I will like to rewrite the equation as

z/-7=-1

Hope you understand...it still means the same thing so let's solve

Cross multiply

z=+7

Waoh....see how simple it is

The main reason why I have to rewrite the equation is for better understanding and to make the work easier

I believe this will help you to understand it better

aalyn [17]3 years ago
6 0

Answer:

A. 7

Step-by-step explanation:

z ÷ (–7) = –1.

multiply each side by -7

z ÷ (–7)*-7 = –1.*-7

z = 7

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Using the square-and-multiply approach, we have

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and so, using the property that, if a_1\equiv b_1\mod n and a_2\equiv b_2\mod n, then a_1a_2\equiv b_1b_2\mod n, we get

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7^{50}\equiv9\equiv1\mod4
7^{101}\equiv7\times1\equiv7\equiv3\mod4
7^{203}\equiv7\times9\equiv3\times1\equiv3\mod4
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