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3 years ago

Solve for the unknown in the equation 3(x-1)=21

Mathematics

2 answers:

dimaraw [331]3 years ago

6 0

Answer:

Step-by-step explanation:

The main idea of how to solve it is to isolate the variable. Whatever you multiply, divide, add, or subtract on one side, you must do the same to the other side so that both sides are equal.

3(x-1) = 21

3(x-1) / 3 = 21 / 3

x - 1 = 7

+ 1 + 1

x = 6

tigry1 [53]3 years ago

3 0

Answer:

x = 8

Step-by-step explanation:

First distribute

then +3 to both sides

which becomes 3x = 21

then divide both sides by 3 to get X by itself

You might be interested in

How is "y more than 4 is -36" written and what is the answer

Crazy boy [7]

Answer:

y+4=-36 and the answer is y=-40

Step-by-step explanation:

So the word is means equals, meaning we can change it to say

"y more than 4 = -36

and more than means addition so we can put a plus sign there and we get

y+4=-36

then to solve this equation we need to get y by itself on one side and to do that we can move the 4 to the other side by subtracting it on both sides to cancel out the addition and we get y=-40

I hope this helps and please don't hesitate to ask if there is anything still unclear!

8 0

3 years ago

Help me!!!!!!!!!???!!!!!!!!!!!!!!;

frozen [14]

20,112.5 meters

Multiply the length of the track by 10, then multiply that number by 5

3 0

3 years ago

A farmer watered 3/8 of a field. What percentage is equivalent to the fraction of the field the farmer watered?

umka2103 [35]

Answer:

37.5 percent.

Step-by-step explanation:

100/8=12.5. 12.5*3=37.5.

I hope this helped!!

6 0

4 years ago

Read 2 more answers

According to a survey of 100 people regarding their movie attendance in the last year, 40 had seen a science fiction movie, 55 h

erastovalidia [21]

Answer:

The probability that at least one movie had seen P(S∪(AD)∪H) = 0.75

Step-by-step explanation:

The total number of movie attendance in the last year n =100

Let 'S' be the event had seen science fiction movie

The probability of that the event had seen science fiction movie

P(S) = 40/100 = 0.4

Let 'AD' be the event had seen adventure movie

the probability of that the event had seen adventure movie

P(AD) =55/100 = 0.55

Let 'H' be the event had seen Horror movie

The probability of that the event had seen Horror movie

P(H) =20/100 = 0.2

given data 25 had seen a science fiction movie and an adventure movie

The probability of that the seen a science fiction movie and an adventure movie

that is P(S∩(AD)) = 25/100=0.25

Given 5 had seen an adventure movie and a horror movie

The probability of that the seen adventure movie and a horror movie

That is P((AD)∩ H) = 5/100=0.05

Given 5 had seen an science movie and a horror movie

The probability of that the seen science movie and a horror movie

That is P((S∩ H) = 15/100=0.15

Given only 5 people had seen a movie from all three categories.

The probability of that the seen a movie from all three categories.

That is P(S∩(AD)∩H) =5/100=0.05

The probability that at least one movie had seen P(S∪(AD)∪H) =

= P(S)+P(AD)+P(H) - P(S∩(AD)-P((AD)∩ H)-P((S∩ H) + P(S∩(AD)∩H)

= 0.4+0.55+0.2-0.25-0.05-0.15+0.05

= 0.75

3 0

3 years ago

Please help

nikitadnepr [17]

Answer:

The value of x is $\frac{-2}{5}$ .

Step-by-step explanation:

Given expression is:

$\frac{2}{3}(x-2)=4x$

We have to solve this for x.

First we will multiply both sides of the equation by 3

$3*\frac{2}{3}(x-2)=4x*3$

2(x-2) = 12x

2x-4=12x

Now we will be subtracting 2x from both sides of the equation

2x-2x-4=12x-2x

-4=10x

10x=-4

Dividing both sides by 10

$\frac{10x}{10}=\frac{-4}{10}\\\\x=\frac{-2}{5}$

Hence,

The value of x is $\frac{-2}{5}$ .

8 0

3 years ago