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Elis [28]
3 years ago
8

63 is 90% of what number using number lines

Mathematics
2 answers:
Dmitry_Shevchenko [17]3 years ago
7 0
First of all make a number line by dividing the line into 10 equal sections. You could make a line 10cm long divided into 1cm divisions or boxes. Now mark off the 9cm position. That’s 90%. Next write the number 63 over all 9 sections. Each section represents 63/9=7. So the last section must also be 7. When we add 7 to 63 we get 70. So since the 10cm line represents 100%, 70 must be 100%. That is the answer using a number line.
Citrus2011 [14]3 years ago
5 0
Well, the answer is 70 but, I don't know how to find it using a number line. Hope I could help!
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60% of 25 is 15

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2.5x6=15

Hope This Helps.

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2 years ago
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3 years ago
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Write an<br> explicit formula for An, the nth term of the sequence 7, -42, 252, ....
erik [133]

Answer:

A_n = 7(-6)^{n-1}

Step-by-step explanation:

<u>Key skills needed: Explicit formula, Geometric sequence</u>

1) This is a geometric sequence, meaning a constant (like 6 or 3.5) is being multiplied to every term. First we need to find the constant.

This can be done by doing -42 ÷ 7   or   252 ÷ -42

-42 ÷ 7 equals -6.

252 ÷ -42 also equals -6.

2) This means that constant is -6.

3) The general form for an explicit formula of a geometric sequence is:

a_n = a_1(r)^{n-1}

--> r means the constant (or common ratio) that is being multiplied.

--> a_1 means the first term

--> a_n means the "nth" numbered term (so a_3 is the 3rd term, a_{10} is the 10th term and so on).

--> n-1 is just the "n" in a_n minus 1.

4) We can use this formula to create an explicit formula for the geometric sequence in the problem.

--> r = -6 (Since we got -6 as the constant/common ratio).

--> a_1  = 7 (Since 7 is the 1st term)

This means that our formula would be --> A_n = 7(-6)^{n-1}

<em>Hope you understood and have a nice day!! :D</em>

8 0
3 years ago
| 2x + 2y = 10<br> y = 5+x
melisa1 [442]
2x + 2(5+x)=10
2x+10+2x=10
4x+10=10
4x=0
X=0
6 0
3 years ago
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