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4 years ago

Evaluate: 5 - 3 x when x = - 7

Mathematics

2 answers:

Tema [17]4 years ago

5 0

Use the substitution method

5-3x

5-3(-7)

Do the bracket first

-3*-7= 21

5+21= 26

Answer : 26

8_murik_8 [283]4 years ago

4 0

Answer:

5+-21=-16

Step-by-step explanation:

you distribute 3 into -7 nd you get -21 then you add 5 to -21 to get -16

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The ship is 25.54 miles away from the lighthouse.

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4 years ago

HELP!!!! What is-15=(3x-10)-5x

omeli [17]

Answer:

Step-by-step explanation:

$-15=(3x-10)-5x\\\\-15=3x-10-5x\qquad\text{combine like terms}\\\\-15=(3x-5x)-10\\\\-15=-2x-10\qquad\text{add 10 to both sides}\\\\-15+10=-2x-10+10\\\\-5=-2x\qquad\text{divide both sides by (-2)}\\\\\dfrac{-5}{-5}=\dfrac{-2x}{-2}\\\\2.5=x\to x=2.5$

3 0

3 years ago

Read 2 more answers

Please solve this -2x + 12y - 4

Juli2301 [7.4K]

2 (2x - (2 - 2y + 3x) + 4y) =
2 (2x - 2 - 2y + 3x + 4y) =
2 (5x + 2y - 2) =
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This was my solution.

8 0

3 years ago

Solve for x: 3x - 5 + 2x = 25 - 5x

VashaNatasha [74]

Answer:

x=3

Step-by-step explanation:

Add 2x and 3x

5x-5=25-5x

move -5x to the other side by adding 5x on both sides:

10x-5=25

Add 5 on both sides:

10x=30

Divide 10 on both sides:

x=3

Hope this helps!

5 0

3 years ago

Read 2 more answers

2x^2 -33 =392x^2 =72 x^2 =36x=6 RYan worked the following problem. He made an error. What is the correct answer.

Marrrta [24]

When we find the square root of a number we get 2 options, the positive and the negative one, for example:

$\begin{gathered} \sqrt{16}=4 \\ or \\ \sqrt{16}=-4 \end{gathered}$

Therefore, Ryan made an error in the last step because x is equal to 6 or x is equal to -6:

$\begin{gathered} x^2=36 \\ x=\sqrt{36} \\ x=6 \\ or \\ x=-6 \end{gathered}$

3 0

1 year ago