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Sholpan [36]
3 years ago
13

How to solve this equation and check it. a - 2.5 = 4.5?

Mathematics
1 answer:
Bezzdna [24]3 years ago
5 0

Answer:

Step-by-step explanation:

a - 2.5 = 4.5

     2.5 = 2.5

a = 7.0 or 7

7.0 - 2.5 = 4.5

4.5 = 4.5

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I write out all the whole numbers, starting from 1. If I wrote 1994 digits altogether, what was the last complete number I wrote
Nataly_w [17]

Answer:

You wrote the numbers from 1 to 9: 9 digits.

You wrote the numbers from 10 to 99: 90*2 = 180 digits.

You have written 189 digits.

Then you wrote another 1994 - 189 = 1805

All the numbers from 100 to 999 have 3 digits

So you wrote 1805/3 = 601 2/3

This means 601 full numbers and 2 digits from the 602. number.

So 100 + 601 - 1 = 700 was the last number you wrote.

Do you agree?


3 0
3 years ago
Write an equation for the perimeter of the rectangle
jeka94

Answer:

Area = 2(5x - 4) + 2(5x)

Step-by-step explanation:

Perimeter is the sum of twice the width and twice the length of the rectangle. And since the question is asking us for an equation, we need to write, Area = 2(5x - 4) + 2(5x). When you are required to find the value of x with a given area, just plug that area into the equation, distribute, and simplify to get x.

4 0
2 years ago
Read 2 more answers
If 25 pencils cost $12 find the unit rate per pencil
grin007 [14]

Answer:

$12/25 pencils= $0.48 per pencil

4 0
3 years ago
Read 2 more answers
Are my answers correct?
Snezhnost [94]

Answer:

20 is x ≥ 25

Step-by-step explanation:

In number 20 you put x is less than or equal to 25 ( x ≤ 25 )

It should be x is greater than or equal to 25 ( x ≥ 25 ) because it says it cannot be less than 25.

All your other answers are correct. Good job.

7 0
2 years ago
A student solved z + (-0.72) = -2.5 for z using the
N76 [4]

Answer:

  • Mistake in step1

Step-by-step explanation:

<u>Given</u>

  • z + (-0.72) = -2.5

<u>Solving in steps</u>

  • 1. ⇒ z + (-0.72) - (-0.72) = -2.5 - (-0.72)
  • 2. ⇒ z = - (2.5 - 0.72)
  • 3. ⇒ z = - 1.78

The student's mistake was adding (-0.72) instead of - (-0.72) or 0.72

5 0
2 years ago
Read 2 more answers
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