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sdas [7]
3 years ago
13

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

Mathematics
2 answers:
bezimeni [28]3 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]3 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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85000 nearest to 10,100,1000,10000
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Answer:

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Step-by-step explanation:

85000 is nearest to 10000

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A jug of water is 1/2 full. If 4 children share the water equally,what fraction of the jug will each child get?
Rainbow [258]

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4 years ago
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Layla uses 1.75 cups of sugar per batch of cookies. How many cups of sugar would she require to bake 9 batches of cookies?
ruslelena [56]

Answer:

15.75 cups

Step-by-step explanation:

If she uses 1.75 cups each batch to find how much she uses for 9 batches you just multiply 1.75 by 9 which gives you 15.75 cups

8 0
3 years ago
The height of a puffin is 24.02 cm. Write this number in<br>expanded form.​
beks73 [17]

Answer:

20+4+0.02

Step-by-step explanation:

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  • <em>Then finally you add them together to make sure you have the right answer</em>
3 0
3 years ago
What will be the maximum height <br><br> h (t)=-16t^2+128t+320
Korvikt [17]
To determine the maximum height, h, from the given above. Differentiate the function and equate to zero. Then, determine the value of t. The value, when substituted to the original function, will give the maximum height. For this given, 
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Substituting t = 4 to the original function gives 320. Thus, the maximum height is 320 units. 
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