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zysi [14]
3 years ago
10

-3x + 9 = -18 what's the answer

Mathematics
2 answers:
Rudik [331]3 years ago
7 0

Answer:

x=9

Step-by-step explanation:

Hi there!

We are given the following equation:

-3x + 9 = -18

We want to solve for x

To do that, we need to isolate x on one side; the value of x (the answer) will be on the other side.

We can manipulate numbers in order to help us isolate x on one side.

First, let's remove 9 from the left side; subtract 9 from both sides

-3x + 9 = -18

     - 9    -9

___________________

-3x =    -27

Now, there are no more numbers on the left side, but we aren't done yet. The value of x is also equal to the value of 1x.

In order to find the value of 1x, we can divide both sides by -3, as if you divide any number by itself, the result is 1. x doesn't get divided (there are no other numbers or variables to divide x by when we divide -3x by -3), so the result on the left side would be 1x, or x.

Therefore, we need to divide both sides by -3

-3x/-3 = -27/-3

x= 9

(the number is not negative because when you divide a negative by a negative, the resulting number is positive)

Hope this helps!

Art [367]3 years ago
6 0

Answer:

x=9

Step-by-step explanation:

subtract 9 from both sides.

-3x = -27

divide by -3

x=9

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What is the perimeter of the track in meters use TT= 3.14 and round to the nearest hundredth of a meter
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Answer:

P = 321.3m

Step-by-step explanation:

To help simplify the process of solving this problem, first break it up into different shapes. Here, you have two shapes: a rectangle and a circle (1 semi-circle + 1 semi-circle = 1 circle).

Next, use the equation for circumference of a circle to find the first part of the perimeter (C = πd). In this case, the diameter would be 45m.

  1. C = πd
  2. C = 3.14 × 45
  1. C = 141.3 m

This is the first part of the circumference. Now, you must consider the rectangle. (Because the two shorter sides of the rectangle are not part of the perimeter, do not include these in your final answer.) The length of the rectangle is 90 meters, and since both sides that measure to 90m are part of what makes up the perimeter, lastly add these to the circumference you calculated earlier.

  1. (90 + 90) or (90 × 2) = 180
  2. P = 141.3 + 180
  3. P = 321.3m

Hope this helps! : )

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Diano4ka-milaya [45]

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Step-by-step explanation:

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(add 6.8 to both sides)

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Step-by-step explanation:

Hoped this helped.

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Step-by-step explanation:

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