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2 years ago

7 - 2x = 11 What is the value of x? Show your working.

Mathematics

2 answers:

sukhopar [10]2 years ago

8 0

Answer: x = - 4

Step-by-step explanation:

7-2x=1

PEMDAS

so add 7 to both sides

-2x=8

divide by -2 from both sides

x=-4

BartSMP [9]2 years ago

8 0

Answer:

x = -2

Step-by-step explanation:

Let's find the required value of x,

→ 7 - 2x = 11

→ -2x = 11 - 7

→ -2x = 4

→ x = -4/2

→ [ x = -2 ]

Therefore, the value of x is -2.

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15. What is the sum of a number and its opposite?

ExtremeBDS [4]

Answer:

the sum of two numbers is multplication and its opposite is a negative version of it

Step-by-step explanation:

8 0

4 years ago

C+ax=dx this one has all variables and no numbers

sergeinik [125]

That's OK, but you have not said which variable you want to solve it for.

To solve for 'x':
 c + ax = dx

Subtract c from each side: ax = dx - c

Subtract dx from each side: ax - dx = -c

Factor the left side: x (a - d) = -c

Divide each side by (a - d) : x = -c / (a - d) or x = c / (d - a) .

To solve for 'c': 
 c + ax = dx

Subtract ax from each side and factor: c = x (d - a) 

To solve for 'd': 
 c + ax = dx

Divide each side by 'x': d = c/x + a .

To solve for 'a':
 c + ax = dx

Subtract 'c' from each side: ax = dx - c

Divide each side by 'x': a = d - c/x .
.

6 0

3 years ago

The ratio of Julia’s peas to Vlada’s peas was 3:2. After Julia gave 15 peas to Vlada, she still had 10 more peas than Vlada. How

Ksenya-84 [330]

The ratio of Julia's to Vlada's peas was 3:2.
1. Julia gave Vlada 15 peas.
2. Vlada had how many peas?
3. Vlada had 4:2 peas after Julia gave her 15 more peas. (3:2+15=4:2)
4. Julia still had 15 more than Vlada.
5. Julia had 5:7 because (4:2+15=5:7)
6. To find out the amount of peas she had BEFORE she gave Vlada the peas, you subtract 5:7 from 15. That would equal 4:2.

8 0

3 years ago

A 6-inch candle burns down in 12 hours. After how many hours will it have burned 4 inches?

Zielflug [23.3K]

Answer:

8 hours

Step-by-step explanation:

Let's first find how many inches the candle would have burned in 1 hour.

6 in:12 hours

x: 1 hour

We can divide 12 by 12 to get 1. This means we need to divide 6 by 12 to get x

x=1/2 inches

1/2 inches:1 hour

4 inches: x hours

We divide 4 by 1/2 to get 8. 1/2*8=4. This means...

x=1 hour*8=8 hours

6 0

3 years ago

10 times as many as 1 hundred is hundreds or thousand

Paladinen [302]

10 times as many as 1 hundred is 10 hundred or 1 thousand.

<h3>Further explanation</h3>

Consider the following sentence:

X times as many as Y refer to X multiplied by Y

Therefore, the phrase 10 times as many as 1 hundred is - can be rewritten to 10 multiplied by 100 is

We can say this is a simple multiplication operation, which is one of four basic operations, i.e.,

addition,
subtraction,
multiplication, and
division.

However, the case we face is only a multiplication, not accompanied by another operation.

Let's go back to our problem. We think naturally about this multiplication. 10 times 100 means there are two options like the following:

Addition of 10 as many as 100 times (there are 100 terms, this is too much written).
Addition of 100 as many as 10 times (there are 10 terms, still enough to be written).

Actually both are the same.

10 x 1 hundred = 100 + 100 + 100 + 100 + 100 + 100 + 100 + 100 + 100 + 100

We state it quickly.

10 times as many as 1 hundred thousand is

10 x 1 hundred = 1 thousand, or

$\boxed{ \ 10 \times 100 = 1,000 \ }$

Based on present sources, the proper questions are as follows:

10 times as many as 1 hundred is __? __ hundreds or __? __ thousand.

Therefore, we rewrite the results in the unit form as requested.

10 times as many as 1 hundred is 10 hundred or 1 thousand.

Note:

The commutative property of multiplication: $\boxed{a \times b = b \times a}$

<h3>Learn more</h3>

Explanations and an example of a question about the four types of number form brainly.com/question/4725342
9 ten thousand divided by ten brainly.com/question/545132
5000 is 1/10 of what brainly.com/question/106300

<h3>Keywords: </h3>

10 times as many as 1 hundred, ten, thousand, multiplication, basic operations, addition, terms, unit form

7 0

3 years ago