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Colt1911 [192]
3 years ago
7

Solve for x: 5(2x - 4) = 10

Mathematics
2 answers:
Sveta_85 [38]3 years ago
4 0

Step-by-step explanation:

5(2x–4)=10

10x–20=10

10x=30

x=3

olga55 [171]3 years ago
3 0

Answer:

x = 3

Step-by-step explanation:

First you want to divide both sides by 5 to get 2x-4 = 2.

Afterwards, you add 4 to both sides of the equation. 2x = 6

Divide both sides by 2. x = 3

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Inessa05 [86]

Answer:

3(6)(4) = 72 cm

Step-by-step explanation:

The volume of a rectangular prism = Length * Width * Height

Substitute your values into the equation and solve for V

V = 3 * 6 * 4

V = 72 cm^{2}

7 0
3 years ago
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If $180 is invested at an interest rate of 7% per year and is compounded weekly, how
Rufina [12.5K]

Answer:

$405.4

Step-by-step explanation:

A= P(1+\frac{r}{100}) ^{n}

-->180*(1+7/100)^12

-->$405.4

3 0
2 years ago
Calvin's plane is flying at a speed of 600 miles per hour. If y represents the distance the plane has traveled and z represents
valentina_108 [34]
Y = distance
z = time
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3 years ago
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Which system of linear inequalities has the point (2,1) in its solution set
Ira Lisetskai [31]

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the 2nd one

Step-by-step explanation:

7 0
3 years ago
Kate bought 3 used CDs and 1 used DVD at the bookstore. Her friend Joel bought 2 used CDs and 2 used DVDs at the same store. If
natka813 [3]

Answer:

Cost of 1 DVD is $6.5

Cost of one CD is $4.5

Combine cost of one DVD and CD is $11

Step-by-step explanation:

Given :

Kate bought 3 used CDs and 1 used DVD at the bookstore.

Her friend Joel bought 2 used CDs and 2 used DVDs at the same store.

Kate spent $20

Joel spent $22

To Find :  the cost of a used CD and a used DVD

Solution :

Let cost of 1 used CDs be $x

Let cost of 1 used DVDs be $y

Cost of 3 used CDs = $3x

Cost of 2 used CDs = $2x

Cost of 2 used DVDs = $2y

Kate bought 3 used CDs and 1 used DVD at the bookstore.

She spent $20

So, equation becomes :

⇒3x+y=20 ---(a)

Joel bought 2 used CDs and 2 used DVDs. she spent $22.

So, equation becomes:

⇒2x+2y=22 --(b)

Now solve (a) and (b) to determine the value of x and y

We will use substitution method

Substitute the value of x from (b) in (a)

3(\frac{22-2y}{2} )+y=20

33-3y+y=20

33-2y=20

33-20=2y

13=2y

\frac{13}{2} =y

6.5 =y

Thus cost of 1 DVD is $6.5

Now substitute this value of y in b to get value of x

⇒2x+2(6.5)=22

⇒2x+13=22

⇒2x=22-13

⇒2x=9

⇒x=\frac{9}{2}

⇒x=4.5

Thus the cost of one CD is $4.5

Hence the combine cost of one DVD and CD =  $6.5+ $4.5=$11


6 0
3 years ago
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