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4 years ago

Please help me! I don't understand how to do these type of questions and I need to do 4 of them!

Mathematics

2 answers:

Simora [160]4 years ago

4 0

Answer:

$0.25

Step-by-step explanation:

Ok. You have to set up a system of equations that describe the situation and solve these equations. You are given some informations.

1. The price of a Petunia. Let' s give that a label and call it P.

2. The money left after the purchase. Let's call that number M.

3. The amount of money Ying Ying has in her wallet. Let's call that X.

Now you can form an equation: X = nP + M

Meaning: The money Ying Ying has in her wallet is equal to the value of n Petunias and $M left in her wallet. n and M are given in the table.

If Ying Ying buys 2 Petunias, she has $2 left in her wallet. If I have to describe this in an equation, I would write:

X = 2P + 6.5

All equations would look like this:

X = 2P + 6.5

X = 8P + 5

X = 14P + 3.5

Now you have 3 equations with only 2 unknowns, which can be solved for X and P.

X = 7 and P = 0.25

k0ka [10]4 years ago

3 0

Answer:

each petunia is 25 cents

Step-by-step explanation:

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If 5(3x-1)=55 what is the value of 2x-2

cricket20 [7]

Hey ! there

Answer:

Value of 2x - 2 is 6 .

Step-by-step explanation:

In this question we are provided with an equation that is 5 ( 3x - 1 ) = 55 and we are asked to find the value of 2x - 2 .

Firstly , we need to find the value of x . So we need to solve the equation .

SOLUTION : -

$\quad \longmapsto \qquad \: 5(3x - 1) = 55$

Step 1 : Dividing with 5 on both sides :

$\quad \longmapsto \qquad \: \dfrac{ \cancel{5}(3x - 1)}{ \cancel{5}} = \cancel{\dfrac{55}{5} }$

On cancelling , We get :

$\quad \longmapsto \qquad \:3x - 1 = 11$

Step 2 : Adding 1 on both sides :

$\quad \longmapsto \qquad \:3x - \cancel{1} + \cancel{1} = 11 + 1$

On simplifying , We get :

$\quad \longmapsto \qquad \:3x = 12$

Step 3 : Dividing with 3 on both sides :

$\quad \longmapsto \qquad \: \dfrac{ \cancel{3}x}{ \cancel{3}} = \cancel{ \dfrac{12}{3} }$

We get ,

$\quad \longmapsto \qquad \: \underline{\boxed{\frak{x = 4}}}$

→ Therefore , value of x is 4 .

Verifying : -

Now we are verifying whether our answer is wrong or right . So ,

5 ( 3x - 1 ) = 55

5 { 3( 4 ) - 1 } = 55

5 ( 12 - 1 ) = 55

5 ( 11 ) = 55

L.H.S = R.H.S

Hence , Verified .

Therefore , our value of x is correct/valid .

We need to find the value of 2x - 2 . 

 $\quad \longmapsto \qquad \:2x - 2$ 

So substituting value of x in it :

 $\quad \longmapsto \qquad \:2( \bold{4}) - 2$ 

Multiplying 2 with 4 : 

 $\quad \longmapsto \qquad \:8 - 2$ 

Subtracting 2 from 8 :

$\quad \longmapsto \qquad \: \blue{\underline{\boxed{\frak{6}}}} \quad \: \bigstar$

Henceforth, value of 2x - 2 is ❝ 6 ❞.

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2 years ago

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3 more than the product of 3 and y

Fudgin [204]

Answer:

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Step-by-step explanation:

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3 years ago

(Quadratic Formula) (Irrational level 1)

Leni [432]

Answer:

(-11 +/- sqrt 21) / 10

-0.64 , -1.56 to the nearest hundredth.

Step-by-step explanation:

9v^2 + 11v + 5 = 4v^2

5v^2 + 11v + 5 = 0

Using the quadratic formula:

v = [ - 11 +/- sqrt(11^2 - 4*5*5) ] / 2*5

= (-11 +/- sqrt 21) / 10

= -0.64 , -1.56 to the nearest hundredth.

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