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GuDViN [60]
4 years ago
14

Identify the property that justifies the statement: * If 3x - 14 = 12, then 3x = 26

Mathematics
1 answer:
torisob [31]4 years ago
5 0

Answer:

Subtraction property of equality

Step-by-step explanation:

In mathematics that are various types of properties that can be used to solve for questions

In the above question:

If 3x - 14 = 12

then 3x = 26

The property that is applied here is the Subtraction property of equality.

The subtraction property of equality states that when we subtract from one side of and algebraic expression, we must subtract from the other side

a = b

a - c = b - c

a = 3x

b = 26

c = 14

3x = 26

3x - 14 = 26 - 14

then 3x - 14 = 12

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What is the answer to this ?
harina [27]

Answer:

The answer is option 1.

Step-by-step explanation:

In order to solve x, you have to make x the subject, by multiplying each sides by 5, to get rid of 5 on the left side.

\frac{x}{5}  = 8

\frac{x}{5}  \times 5 = 8 \times 5

x = 40

5 0
3 years ago
An oil change at City Auto is regularly $30. Mr. Allen has a coupon for 15% off. He wants to know the sale price of the service.
AveGali [126]

Answer:85

Step-by-step explanation:

An oil change at City Auto is regularly $30. Mr. Allen has a coupon for 15% off. He wants to know the sale price of the service.

What is the relationship between the sale price and the regular price of an oil change? Complete the statement.

The sale price is (1,2 or 3)% of the regular price.

1. 15%

2. 30%

3. <u>85%</u>

8 0
3 years ago
Read 2 more answers
Can someone please check my answer fast?
Stella [2.4K]
Your answer was:  "g+11 over/ 2x+15 " . 
____________________________________________________
Your answer was "incorrect —but almost correct" !

Instead of "(g + 11)" for the "numerator" ; you should have put:  "(x + 11)" .

As a matter of technicality, you could have/should have stated:
________________________________________________________

 {  x \neq - 7.5 } ; { x \neq -2.5 }. 
________________________________________________________
    →   {
but this would depend on the context — and/or the requirements of the course/instructor.}.  Good job!
________________________________________________________


Explanation:
________________________________________________________

Given:   g(x) =  \frac{(x+6)}{(2x + 5)} ;

Find:  g(x+5) .
 
To do so, we plug in "(x+5)" for all values of "x" in the equation; & solve:
________________________________________________________
        Start with the "numerator":  "(x + 6)" :

→  (x + 5 + 6) = x + 11 ; 
__________________________________
Then, examine the "denominator" :  "(2x + 5)"

→ 2(x+5) + 5 ; 

   →  2(x + 5) = 2*x + 2*5 = 2x + 10 ;  


→ 2(x+5) + 5 = 

        2x + 10 + 5 ; 

    =  2x + 15 ; 
________________________________________________________

→  g(x + 5) =  \frac{x+11}{2x +15}  . 

________________________________________________________
Note that the "denominator" cannot equal "0" ;
         since one cannot "divide by "0" ; 
_______________________________________________________
So, given the denominator:  "2x + 15" ; 

→  at what value for "x" does  the denominator, "2x + 15" , equal "0" ?

→  2x + 15 = 0 ; 

Subtract "15" from each side of the equation:

→  2x + 15 - 15 = 0 - 15 ; 

to get: 

→  2x = -15 ; 

Divide EACH SIDE of the equation by "2" ; 
    To isolate "x" on one side of the equation; & to solve for "x" ; 

→  2x / 2  =  -15 / 2 ; 

to get: 

→  x = - 7. 5 ;  
Your answer was:  "g+11 over/ 2x+15 " . 
____________________________________________________
Your answer was "incorrect —but almost correct" !

Instead of "(g + 11)" for the "numerator" ; you should have put:  "(x + 11)" .

As a matter of technicality, you could have/should have stated:
________________________________________________________

 {  x \neq - 7.5 } ; { x \neq -2.5 }. 
________________________________________________________
    →   {
but this would depend on the context — and/or the requirements of the course/instructor.}.  Good job!
________________________________________________________

So;  " x \neq - 7.5 " .
________________________________________________________
Now, examine the "denominator" from the original equation:
________________________________________________________
→  "(2x + 5)"  ;  

→  At what value for "x" does the 'denominator' equal "0" ? 

→  2x + 5 = 0 ; 

Subtract "5" from each side of the equation: 

→  2x + 5 - 5 = 0 - 5 ; 

to get:

→  2x = -5 ; 

Divide each side of the equation by "2" ; 
     to isolate "x" on one side of the equation; & to solve for "x" ; 

→  2x / 2 = -5 / 2 ;

→  x = -2.5 ; 

→  So;  " x \neq -2.5 " .
____________________________________________________
The correct answer is:
____________________________________________________
 →  g(x + 5) =  \frac{x+11}{2x +15} ;

         {  x \neq - 7.5 } ; { x \neq -2.5 }. 
____________________________________________________

→ Your answer was:  "<span>g+11 over/ 2x+15 " . 
____________________________________________________
Your answer was "incorrect —but almost correct" !

Instead of "(g + 11)" for the "numerator" ; you should have put:  "(x + 11)" .

As a matter of technicality, you could have/should have stated:
________________________________________________________

</span> {  x \neq - 7.5 } ; { x \neq -2.5 }. 
________________________________________________________
    →   {
but this would depend on the context — and/or the requirements of the course/instructor.}.  Good job!
________________________________________________________
5 0
3 years ago
1. Use separation of variables to find the solution to the differential equation subject to the given initial condition.
andrew11 [14]

Answer:

Step-by-step explanation:

Given the differential equation dy/dx = 5y/x subject to the condition y = 4 and x = 1. Using the variable separable method of solving differential equation, we will have;

dy/dx = 5y/x

Separate the variables

dy/5y = dx/x

Integrate both sides of the expression

\frac{1}{5}\int\limits \frac{1}{y}  \, dy = \int\limits \frac{dx}{x} \\ \\\frac{1}{5}lny = lnx + C\\\\lny = 5lnx+5C\\

using the initial condition y = 4 while x = 1

ln4 = 5ln1 + 5C

ln4 = 0+5C

C = ln4/5

Substituting the value of C back into the expression;

lny = 5 lnx+5(ln4/5)\\lny = 5lnx+ln4\\lny = lnx^5+ln4\\lny = ln(4x^5)\\y = 4x^5

<em>Hence the solution to the differential equation is y = 4x⁵</em>

<em></em>

b) Given 4(du/dt) = u²

du/dt = u²/4

du/ u² = dt/4

u⁻²du = 1/4 dt

integrate both sides of the equation

\int\limit {u^{-2}} \, du  = \int\limits\frac{1}{4}  \, dt\\\\\frac{u^{-1}}{-1} = \frac{t}{4} + C\\\\\frac{-1}{u} =  \frac{t}{4} + C

Imputing the initial condition u(0) = 7 i.e when t = 0, u = 7

\frac{-1}{7} =  \frac{0}{4} + C\\\\\frac{-1}{7} =  C\\

\frac{-1}{u} =  \frac{t}{4} - \frac{1}{7}

<em>Hence the solution to the DE is </em>\frac{-1}{u} =  \frac{t}{4} - \frac{1}{7}

6 0
3 years ago
What is the solution to the following system?
VladimirAG [237]
It is C i believe you plug in the answers to get it
7 0
4 years ago
Read 2 more answers
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