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Kruka [31]
3 years ago
7

Write a sistuatetion for 15x - 20 <130 and then solve

Mathematics
1 answer:
rodikova [14]3 years ago
7 0
X=9 beecause 135-20 =115 and 130 is bigger than 130
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Find the perimeter of a square with side a. Are the perimeter of the square and the length of its side directly proportional qua
erik [133]

Answer:

The perimeter is 8 cm.

Yes, the perimeter of a square is directly proportional to its side length.

Step-by-step explanation:

Given:

The side length of the square is, a=2\ cm

The perimeter of a square is the sum of all of its side lengths. The perimeter of a square of side length 'a' is given as:

P=a+a+a+a=4a

Plug in a=2\ cm and find perimeter, 'P'. This gives,

P=4\times 2=8\ cm

Therefore, the perimeter is 8 cm.

Now, two quantities are directly proportional only if their ratio is a constant.

Let us find the ratio of 'P' and 'a'.

We have, P=4a

Dividing both sides by 'a', we get:

\frac{P}{a}=\frac{4a}{a}\\\frac{P}{a}=4(Constant)

Therefore, the ratio of perimeter and side length is a constant. Hence, these are directly proportional quantities.

6 0
3 years ago
order the numbers 0.64, 2/3, 65%, and 7/10, from least to greatest, and explain how you got your answer, please, thank youuuu!
Andrei [34K]
The answer is 0.64,65,2/3,7/10 how I got it is because you need to turn all the numbers into decimals 
7/10=.7
2/3=0.666666.....
and the others one are already in decimal form 
4 0
3 years ago
Can someone help me with this math problem please ​
inysia [295]

Answer:

A is 0.2, B is 0.34, C is 63.02, and D is 91.16

Step-by-step explanation:

For A: 2 divided by 10, For B: 34 divided by 100, For C: 2 divided by 100 and added it to 63, and for D I did 16 divided by 100 and added it to 91.

3 0
3 years ago
Can someone plug some numbers into a small equation real quick for me?:)
Arada [10]
-13 times -7 equals -91
5 0
3 years ago
What is the approximate area of the triangle below?
Alecsey [184]
Can you include a picture of the problem theres no information
7 0
2 years ago
Read 2 more answers
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