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2 years ago

3x+6+6x=42 what is x?

Mathematics

2 answers:

Flura [38]2 years ago

5 0

3x+6+6x=42

9x+6=42

9x+6-6=42-6

9x= 36

Divide by 9 for 9x and 36

9x/9=36/9

x=4

Check answer by using substitution method

3(4)+6+6(4)=42

12+6+24=42

42=42

Answer is x=4

tatiyna2 years ago

4 0

Answer:

x = 4

Step-by-step explanation:

Step 1: Combine like terms

9x + 6 = 42

Step 2: Isolate x by subtracting 6 on both sides

9x = 36

Step 3: Isolate x by dividing by 9 on both sides

x = 4

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Answer:

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6 0

2 years ago

Sophia earned $294 in 24 hours. How many dollars did she earn per hour?

Vadim26 [7]

Answer:

$12.25

Step-by-step explanation:

Step 1:

$294 : 24 Ratio

Step 2:

$294 ÷ 24 Divide

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Hope This Helps :)

6 0

2 years ago

Read 2 more answers

Express 6.83 as a mixed number

Maksim231197 [3]

6.83 as a mixed number is:

6 83/100

4 0

2 years ago

A candy box is made from a piece of cardboard that measures 23 by 13 inches. Squares of equal size will be cut out of each corne

wolverine [178]

Answer:

2.67 inches.

Step-by-step explanation:

Assuming that we represent the size of the squares with the letter y, such that after the squares are being cut from each corner, the rectangular length of the box that is formed can now be ( 23 - 2y), the width to be (13 - 2y) and the height be (x).

The formula for a rectangular box = L × B × W

= (23 -2y)(13-2y) (y)

= (299 - 46y - 26y + 4y²)y

= 299y - 72y² + 4y³

Now for the maximum volume:

dV/dy = 0

This implies that:

299y - 72y² + 4y³ = 299 - 144y + 12y² = 0

By using the quadratic formula; we have :

$= \dfrac{-b \pm \sqrt{b^2 -4ac}}{2a}$