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Anuta_ua [19.1K]
3 years ago
5

What is the simplified form of this expression? (7 + x) + (487-4-1)

Mathematics
1 answer:
tamaranim1 [39]3 years ago
3 0

Answer:

Step-by-step explanation:

( 7 + ) + ( 4 8 7 − 4 − 1 ) (x+ 7 ) + (4 8 7− 4 − 1 )

( + 7 ) + 4 8 2 x+ 7 + 4 8 2

Add numbers

+ 48 9

Answer is x+489

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X^2 - y^2 = 100
luda_lava [24]

Answer:

20

Step-by-step explanation:

Let's start by rewriting the second equation in terms of "x":

x+y=5

Subtract y from both sides:

x=5-y

Now, substitute "5-y" for "x" in the first equation:

(5-y)^2-y^2=100

Note that:

(a-b)^2=a^2-2ab+b^2

25-10y+y^2-y^2=100

Cancel out like terms:

25-10y=100

Subtract 25 from both sides:

-10y=75

Divide both sides by -10

y=\frac{75}{-10}=\frac{15}{-2}=-\frac{15}{2}

Now, substitute this value back into either of the equations to solve for x.

x+y=5\\x-\frac{15}{2}=5\\

Add 15/2 to both sides:

x=5+\frac{15}{2}\\x=\frac{10}{2}+\frac{15}{2}\\x=\frac{25}{2}

Now, find the difference:

x-y=\frac{25}{2}-(-\frac{15}{2})=\frac{25}{2}+\frac{15}{2}=\frac{40}{2}=20

8 0
2 years ago
What is the slope of (-4,3) and (-3,1)
xxTIMURxx [149]
-.5 or negative 1/-2
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8 0
3 years ago
Read 2 more answers
Explain what happens when you round 4.999 to the nearest tenth
Reptile [31]
It would round to 5 because 4.999 is closer to 5 than a decimal (idk if that's 100%)
5 0
3 years ago
Pls help will give brainliest and 5 star
jeka94

Answer:

The answers are as follows:

5. c

6. b

7. not sure, sorry

8. b

Step-by-step explanation:


8 0
3 years ago
If it takes 1 person 2/3 of a minute to prepare a bag how long would it take 4 peiple to prepare a bag?
Anna11 [10]

Answer:

1/6 of a minute.

Step-by-step explanation:

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3 years ago
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