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sdas [7]
2 years ago
13

-x + 1 = x + 21solve for xI need this asap​

Mathematics
2 answers:
bezimeni [28]2 years ago
8 0

Answer:

x = -10

Step-by-step explanation:

-x + 1 = x + 21

(given)

__________

-x + 1 = x + 21

+x +x

(addition property of equality)

(add the x term on both sides to cancel out -x)

__________

1 = 2x + 21

-21 -21

(subtraction property of equality)

(subtract by 21 on both sides to get rid of the constant term on the x side)

________

-20 = 2x

÷2 ÷2

(division property of equality)

(divide to get rid of the coefficient of 2 in the x term)

_______

-10 = x

(symmetric property of equality)

(switch both sides so that x is on the left)

_______

x = -10

________________________________

Proof by substitution:

x = -10 because

x = -10 → -x + 1 = x + 21 → -(x) + 1 = (x) + 21 → -(-10) + 1 = (-10) + 21 → 10 + 1 = 21 - 10 →

11 = 11

levacccp [35]2 years ago
3 0

Answer:

x=10

Step-by-step explanation:

Put both of the x on one side, and the numbers on the other side (this breaks down the equation).

This is make it easier for you to add/substract/divide/multiply.

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Round to the nearest hundredth 0.2189
Aleks04 [339]

Answer:

0.22

Step-by-step explanation:

4 or less let it rest, 5 or more add one more!.

8 is greater than 1 so you add one to 1 which equals 2, so your answer would be 0.22

6 0
3 years ago
Find the volume of a cone with a diameter of 12 m and a height of 6 m.
castortr0y [4]

Answer: D. 72 m

Step-by-step explanation:

The formula for the volume of a cone is Volume = pi times radius squared and then times the height, and then divided by 3.

Since the diameter is 12, the radius is 6. Applying the formula, 6 squared is 36, times pi is 36 pi. The height is 6 so 36 * 6 = 216.

But be careful, we're not done yet... We still have to divide by 3

216 / 3 = 72

we can be sure this answer is correct because the other answers are clearly too big

here's your answer, hope this helps :)

3 0
2 years ago
15PTS PLEASE HELP ASAP!<br> (dont write random answers pls)
Anna35 [415]

Answer:

c

Step-by-step explanation:

3 0
3 years ago
What are two numbers that have a product of 12 and a sum of 5
pashok25 [27]

Answer:

there are no two numbers that have a product of 12 and a sum of 5 make sure that the question is correct

yo can find two numbers that have a product of 12 and a sum of 7 the answer is 3 and 4 .

Step-by-step explanation:

6 0
3 years ago
4c-7.8 Evaluate the expression if c=4
slavikrds [6]
I hope this helps you



4.4-7,8


16-7,8


8,2
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