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Ilya [14]
3 years ago
12

Is -3 a solution to the equation 3x-5=4+2x explain PLZ HELP!

Mathematics
1 answer:
morpeh [17]3 years ago
7 0

Answer:

  • No, the answer is 9

Step-by-step explanation:

<u>Solve equation</u>

  • 3x - 5 = 4 + 2x
  • 3x - 5 - 2x + 5 = 4 + 2x - 2x + 5
  • x = 9
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Which expressions are equivalent to the one below? Check all that apply. 21^x/3^x
satela [25.4K]

Answer:

<em>options:  A,C,E </em>are correct.

Step-by-step explanation:

We have to find the expression equivalent to the expression:

\dfrac{21^x}{3^x}

we know that: 21^x=(3\times7)^x\\\\21^x=3^x\times7^x

Hence,

\dfrac{21^x}{3^x}=\dfrac{3^x\times7^x}{3^x}=7^x-----(1)

A)   (\dfrac{21}{3})^x= 7^x  (same as(1))

Hence, option A is correct.

B)  7 ; which is a different expression from (1)

Option B is incorrect.

C) 7^x   (Same as (1))

Option C is correct.

D) (21-3)^x=18^x   which is a different expression from (1)

Hence, option D is incorrect.

E) \dfrac{7^x\times3^x}{3^x}=7^x   ; which is same as (1)

Hence, Option E is correct.

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Hence, option F is incorrect.

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To mix plaster for a dental model, 35 mL of water is used for 100g of plaster. How many mL of water should be used for 250g of p
laila [671]

Okay, here we have this:

Considering the provided information, we are going to calculate the requested value, so we obtain the following rule of three:

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Solving for x:

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