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cestrela7 [59]
3 years ago
7

X - 3= -21 This is so confusing:(​

Mathematics
2 answers:
denis-greek [22]3 years ago
8 0

Answer:

x = -18

Step-by-step explanation:

x - 3 = -21

add 3 to both sides

x - 3 + 3 = -21 + 3

x = -18

sidenote: you can add anything to both sides of an equation, and it'll still be true. for example, 2 = 2, if you add 1 to both sides you get 3=3 which is still true.

Aneli [31]3 years ago
6 0

Answer:

\huge\boxed{x=-18}

Step-by-step explanation:

In order to solve this, we are trying to find the value of x. Basically, x is a placeholder for a number that is unknown. Some number minus 3 is equal to 21.

Our goal is to find x. To do this we want to isolate x on one side of the equation

x-3=-21

Let's add 3 to both sides.

x-3 + 3 = -21+3\\\\-3 + 3 = 0\\\\x = -21+3\\\\x=-18

Hope this helped!

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Llll answer this an i will mark u brainliest​
damaskus [11]
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3 0
2 years ago
The Johnson twins were born nine years after their older sister. This year, the product of the three siblings ages is exactly 18
KATRIN_1 [288]

Answer: The age of the twins is 10 years.

Step-by-step explanation:

Suppose the age of older sister be x

Let the age of twins sister be x-9, as they are born after 9 years.

Product of their ages be

x(x-9)(x-9)\\\\=x(x^2-18x+81)\\\\=x^3-18x^2+81x

Sum of their ages will be

x+x-9+x-9\\\\=3x-18

According to question,

1861+3x-18=x^3-18x^2+81x\\\\x^3-18x^2+81x-3x+18-1861=0\\\\x^3-18x^2+78x-1843=0\\\\x=19

So, Age of older sister will be 19 years.

Age of the twins will be

19-9=10\ years

Hence, the age of the twins is 10 years.

3 0
3 years ago
Your school is organizing a carnival. You are building a ramp for a game. The surface of the ramp will be 8 feet long with a tot
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Step-by-step explanation:

I don't have a calculator but just plug that in in degree mode.

8 0
3 years ago
Find the volume of a triangular pyramid with a base area of 24 ft2 and a height of 18 ft.
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Volume = (1/3) * base area * height
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4 0
2 years ago
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Before a movie began, a theater had people waiting in the seats. During each of 4 movie trailers, 7 more people came into the th
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Answer:

well assuming that it's linear the

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8 0
3 years ago
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