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melisa1 [442]
2 years ago
11

Find the rule. Solve for n. Х 12 15 20 Y 7 10 15 17 n Rule:​

Mathematics
1 answer:
Novosadov [1.4K]2 years ago
4 0

Answer:

n =22

Step-by-step explanation:

12-5=7

15-5=10

20-5=15

n-5=17

collect like terms

n=17+5

n=22

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7x-5y=-15 and -14x+7y=0 Solve by elimination
geniusboy [140]

Answer: (5,10)

Step-by-step explanation:

multiply first equation with 2 and add it to second to eliminate X

7x-5y=-15  //*2

14x-10y=-30

-14x+7y=0

----------------

-3y=-30

y=-30/-3

y=10

7x=50-15

7x=35

x=35/7

x=5

4 0
2 years ago
Prove that for any natural n the number 3^(n+4)−3^n is divisible by 16.
gtnhenbr [62]

Answer:

Proved (See Explanation)

Step-by-step explanation:

Show that 3ⁿ⁺⁴ - 3ⁿ is divisible by 16.

This is done as follows

\frac{3^{n+4} - 3^n}{16}

From laws of indices;

aᵐ⁺ⁿ = aᵐ * aⁿ.

So, 3ⁿ⁺⁴ can be written as 3ⁿ * 3⁴.

\frac{3^{n+4} - 3^n}{16} becomes

\frac{3^n * 3^4 - 3^n}{16}

Factorize

\frac{3^n(3^4 - 1)}{16}

\frac{3^n(81 - 1)}{16}

\frac{3^n(80)}{16}

3ⁿ * 5

5(3ⁿ)

<em>The expression can not be further simplified.</em>

<em>However, we can conclude that when 3ⁿ⁺⁴ - 3ⁿ is divisible by 16, because 5(3ⁿ) is a natural whole number as long as n is a natural whole number.</em>

3 0
3 years ago
What is a rational number?
Sever21 [200]

Step-by-step explanation:

A rational number is any number that can be divided (written as a fraction) by.

Examples: 1/2, 3, 5/9

*Irrational numbers: cannot be divided

Examples: π, 3.53465374765768957965...

3 0
2 years ago
Read 2 more answers
Find the difference. write the difference in lower term 8 ⅓-5
sergejj [24]

Given data:

The given expression is 8 ⅓-5.

The given expression can be written as,

\begin{gathered} 8\frac{1}{3}-5=\frac{25}{3}-5 \\ =\frac{25-15}{3} \\ =\frac{10}{3} \end{gathered}

Thus, the difference of the given expression is 10/3.

5 0
1 year ago
Help i want to know what is 5m and 10m in feet and explain if you can
tatyana61 [14]
Well, to start with, 1 meter = 3 feet.
5 meters = 15 feet.
10 meters = 30 feet. 
so 5 meters is 15 feet, and 10 meters is 30 feet. Hope this helps:)
7 0
2 years ago
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