how many solution does following equtitions have 7x+21=21

Answers

Answer 1

One solution.

[tex]7x + 21 = 21 \\ 7x = 21 - 21 \\ 7x = 0 \\ x = 0[/tex]

If we can solve for the value of x. Then the solution would be one only for system of linear equations.

For your information, When the equation is true or rather say that both sides are the same, the solution will be infinite.

When the equation is false or rather say that both sides have different number or value then there won't be any solutions.

Related Questions

Anna has more money than Betty. If Anna gave Betty $200, then they would have the same amount of money. While if Betty gave Anna $220, Anna would then have twice as much as Betty. Calculate the amount of money each girl has using the substitution method

Answers

Answer:

Anna has $1460

Betty has $1060

Step-by-step explanation:

let Anna's money be x

and Betty's money be y

If Anna gave Betty $200, then they would have the same amount of money

Anna's money will reduce by 200

x=x-200

Betty's money will increase by 200

y= y+200

if they have the same amount of money, the difference will be zero

x-200=y+200

x-200-y-200=0

x-y-400=0

x-y=400--------------1

this means that Anna has $400 more than Betty

if Betty gave Anna $220, Anna would then have twice as much as Betty.

Betty's money will reduce by 220

y=y-220

Anna's money will increase by 220

x=x+220

Anna's money will double that of Betty's

x+220=2(y-220)

x+220= 2y-440

x=2y-440-220

x=2y-660--------------------2

put x= 2y-660 in eqn 1

(2y-660)-y=400-------------------------1

2y-y=400+660

y= 1060

so Betty has $1060

put y= 1060 in eqn 1

x-y=400

x-1060=400

x=400+1060

x=1460

so Anna has $1460

A lender charges 3.25% of the loan amount for closing costs on a $165000 home loan. Determine the closing costs.

Answers

Answer:

$5,362.50

Step-by-step explanation:

3.25% = 0.0325

165000 x 0.0325 = 5,362.50 dollars

Answer:

$5,362.50

Step-by-step explanation:

LINEAR EQUATIONS!
7(6-y)=-3(y-2)

Answers

Answer:

y=9

Step-by-step explanation:

Isolate the variable by dividing each side by factors that dont contain the variables

move variable to left side and change its sign

42-7y+3y=6 collect like terms

-7y +3y=6-42

-4y=6-42

-4y=-36 divide both sides of the equation by -4

y=9

hope that helps :)

There are 150 students in the sixth grade at Nimitz Middle School. Of these students, 12 students write left-handed. What percentage of the sixth graders at this middle school write left-handed?

Answers

Answer:

nnnnnnnnnnnnnnnnnnnnnn

Step-by-step explanation:

jjjjjjjjjjjjjjjjjjjjjjjj

M = -3 hope this helped

W = -3 ahhahahahahahah

WHAT IS 0-0 NEED HELP ASAPPPPP ROCKEY PLS WILL MAKR BRAINLIEST

Answers

Answer: its 0 right or is it supposed to be a face or sumthin

Step-by-step explanation:

all of the following represents the same ratio except 4:3 4/3 or 3 to 4

Answers

Answer:

3 to 4

Step-by-step explanation:

cause 4:3 can be written as 4/3 or 4 to 3

but 3 to 4 is written as 3:4 or 3/4

Answer:

3 to 4

Step-by-step explanation:

All of the other ratios are 4 to 3.

In the diagram below, what is the approximate length of the minor arc DE?
A. 19.7 cm
B. 11.8 cm
C. 47.1 cm
D. 23.6 cm

Answers

Answer:

its 23.6 not 19.7 the other guy guessed

Step-by-step explanation:

23.6

Answer:

The correct answer is 23.6

Step-by-step explanation:

I just got it correct.

Factorise completely

a) ( 2 + 2 + 2) a) 9a(x – 3b ) - 4 (x – 3b)
b) 5a(2b – 3 ) - 4 (2b – 3)
c) x( 2h-k )+ 3y ( k – 2h )

Answers

Answer:

a) 9a(x - 3b) - 4(x - 3b) = (9a - 4)(x - 3b)

b) 5a(2b - 3) - 4(2b - 3) = (5a - 4)(2b - 3)

c) x(2h - k) + 3y(k - 2h)

= x(2h - k) - 3y(2h - k)

= (x - 3y)(2h - k)

Step-by-step explanation:

Answer:

a) (9a-4)(x-3b)

b) (5a-4)(2b-3)

c) (x-3y)(2h-k)

Step-by-step explanation:

9a(x – 3b ) - 4 (x – 3b) = (9a-4)(x-3b)

Since both 9a and -4 are multiplied by (x-3b), they can be put in a bracket too.

5a(2b – 3 ) - 4 (2b – 3) = (5a-4)(2b-3)

Since both 5a and -4 are multiplied by (2b-3), they can be put in a bracket too.

x( 2h-k )+ 3y ( k – 2h ) = x(2h-k) - 3y (-k + 2h)

We can multiply + 3y ( k – 2h ) by (-1) to switch up the arithmetic operations.

x(2h-k) - 3y (-k + 2h) = x(2h-k) -3y(2h-k)

Since both x and -3y are multiplied by (2h-k), they can be put in a bracket too.

x(2h-k) -3y(2h-k) = (x-3y)(2h-k)

plz, answer the question in the photo.

Answers

I'm pretty sure that the answer is a

Answer:

I believe it is D

Step-by-step explanation:

Gary has 23 quarters in his bank he saves 4 more quarters each week what will the total value of Gary’s bank be in four weeks??

Answers

Answer:

39 quarters, or 9.75 dollars.

Step-by-step explanation:

We can turn this into an algebra equation.

23 + 4x If x = 4

x stands for the number of weeks.

After solving that, we get 39 quarters.

To turn it into dollars, we divide it by 4 (because 4 quarters is equal to one dollar) and then we get 9 3/4. 3/4 dollars is just .75 cents, so the answer is 9.75 dollars.

Garry will have 39 quarters or $9.75 in his bank as per linear equation in 4 weeks.

What is a linear equation?

A linear equation is an equation where the variable has the highest power of one.

Give, Garry has 23 quarters.

He saves 4 quarters each week for the next weeks.

Therefore, after 4 weeks Garry will save a total of (4 × 4) quarters = 16 quarters.

Hence, after 4 weeks Garry will have in his bank account is (23 + 16) quarters = 39 quarters = $9.75.

Learn more about linear equation here: https://brainly.com/question/4482384

#SPJ2

There are 18 people on a basketball team, and the coach needs to choose 5 to put into
a game. How many different possible ways can the coach choose a team of 5 if each
person has an equal chance of being selected?

Answers

Answer:

He can choose by each players skill and depending on how long the game is he can sub them out throughout the game

Step-by-step explanation:

The total different possible ways can the coach choose a team of 5 if each person has an equal chance of being selected is, 8568 or C(18, 5)

What are permutation and combination?

A permutation can be defined as the number of ways a set can be arranged, order matters but in combination the order does not matter.

We have 18 people on a basketball team.

The coach needs to choose 5 to put into a game.

So the total different possible ways can the coach choose a team of 5 if each person has an equal chance of being selected is:

[tex]= \rm _{18}^{}\textrm{C}_5[/tex]

[tex]= \dfrac{18!}{5!\times 13!}[/tex]

= 8568

Thus, the total different possible ways can the coach choose a team of 5 if each person has an equal chance of being selected is, 8568 or C(18, 5)

Learn more about permutation and combination here:

https://brainly.com/question/2295036

#SPJ2

Hannah took $50.00 to go shopping and she bought 2 shirts for $17.00 each how change did she have left

Answers

Answer: Hannah had $16.00 left.

Step-by-step explanation: First, you add $17.00 plus $17.00 or $17.00 times 2 which gives you $34.00. Then, you subtract $50.00 minus $34.00 which gives you $16.00.

NEED HELP!!!

Is an equation that has 0 for a solution the same as an equation with no solution? Explain.

Answers

Answer:

(9/4)X = (1 +5/4)X = (1 +1.25)X = X + 125%·X

Jack needs to increase X by 125% to get 9/4X.

_____

Example:

X = 100, 9/4X = 225

125%X = 125, so X + 125%X = 100 +125 = 225 . . . as required.

Helpp pleasee it's solving mulit=step equations.

Answers

Answer:

The answers are

x=-2

m=23

a=-24

x=6

Answer:

Step-by-step explanation:

1. x+5=3

x= 3-5=-2

2. m-4=19

m= 19+4=23

3. a÷6=-4

Multiply by 6 on both sides we get

a = -4×6=-24

4. -6x =-36

Divide by -6 on both sides

x =6

Someone help plz right answer gets brainliest

Answers

Answer:

CGIA

Step-by-step explanation:

maths

PLEASE HELP im to stupid

Answers

Answer:

line BC, 4 units right, and down 1 unit!

Hope This Helps!

Answer:

1. BC

2. 4

3. 1

Step-by-step explanation:

A bicycle has a listed price of $765.95 before tax. If the sales tax rate is 9.5%, find the total cost of the bicycle with sales tax Included.

Answers

Answer:

The total cost is $ 589.06

Step-by-step explanation:

Answer:

$838.72

Step-by-step explanation:

$765.95 x 1.095 = $838.72

whats the percent increase from $6 to $66

Answers

Answer:

6 x 1100% = $66

Step-by-step explanation:

what is 32z-48 factored with gcf

Answers

Answer:

We found the factors and prime factorization of 32 and 48. The biggest common factor number is the GCF number. So the greatest common factor 32 and 48 is 16.

Step-by-step explanation:

What is the GCF of 32and 48?

Greatest common factor (GCF) of 32 and 48 is 16.

Q2
How
many cubic metres of earth must be dug to construct a well 7
m deep and of diameter 2.8 m?

Answers

Answer:

43.103m³

Step-by-step explanation:

This is just finding the volume of a cylinder problem.

Area of a circle = πr²

Area of circle * length of cylinder = volume

3.14*(1.4)² = 6.158m²

6.158*7 = 43.103m³

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