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elena55 [62]
3 years ago
14

What is the simplified form of the expression 3 + 8x − 2y − x + 1 + 4y?

Mathematics
2 answers:
QveST [7]3 years ago
8 0
4+7x+2y
that is your answer
loris [4]3 years ago
8 0
You want to combine like terms so that means each term has to have the same variable and exponent. There are no exponents so now we look at the variable. So, +8x and -x have the same variable so add them together. 8x+ -x which is the same as subtracting since -x is negative.

8x-x= 7x      7x is positive

You still have 3 and - 2y +4y and +1. Now combine -2y and +4y

-2y + 4y = 2y

you still have 2 like terms, 3 and 1.

3+ 1 is 4

so its 4+2y+7x
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Please help me I need this for exam tomorrow and can u please show the working
Sergio [31]

Answer:

46,57/4

Step-by-step explanation:

area = π.r^2 = π.(d^2)/4

d^2 = AB^2= 5,6^2+3,9^2 =46,57

----> area = π.46,57/4

7 0
2 years ago
Really need help please please help
Assoli18 [71]

Answer:

  1. 1000,000
  2. 2.0
  3. 77,255,0,0.84831,0,0,0
  4. 45,24 27,14 27,34

Step-by-step explanation:

Thanks Okay

8 0
2 years ago
You want to get from a point A on the straight shore of the beach to a buoy which is 54 meters out in the water from a point B o
anyanavicka [17]

Answer:

x =\dfrac{45 \sqrt{6}}{ 2}

Step-by-step explanation:

From the given information:

The diagrammatic interpretation of what the question is all about can be seen in the diagram attached below.

Now, let V(x) be the time needed for the runner to reach the buoy;

∴ We can say that,

\mathtt{V(x) = \dfrac{70-x}{7}+\dfrac{\sqrt{54^2+x^2}}{5}}

In order to estimate the point along the shore, x meters from B, the runner should  stop running and start swimming if he want to reach the buoy in the least time possible, then we need to differentiate the function of V(x) and relate it to zero.

i.e

The differential of V(x) = V'(x) =0

=\dfrac{d}{dx}\begin {bmatrix} \dfrac{70-x}{7} + \dfrac{\sqrt{54^2+x^2}}{5} \end {bmatrix}= 0

-\dfrac{1}{7}+ \dfrac{1}{5}\times \dfrac{x}{\sqrt{54^2+x^2}}=0

\dfrac{1}{5}\times \dfrac{x}{\sqrt{54^2+x^2}}= \dfrac{1}{7}

\dfrac{5x}{\sqrt{54^2+x^2}}= \dfrac{1}{7}

\dfrac{x}{\sqrt{54^2+x^2}}= \dfrac{1}{\dfrac{7}{5}}

\dfrac{x}{\sqrt{54^2+x^2}}= \dfrac{5}{7}

squaring both sides; we get

\dfrac{x^2}{54^2+x^2}= \dfrac{5^2}{7^2}

\dfrac{x^2}{54^2+x^2}= \dfrac{25}{49}

By cross multiplying; we get

49x^2 = 25(54^2+x^2)

49x^2 = 25 \times 54^2+ 25x^2

49x^2-25x^2 = 25 \times 54^2

24x^2 = 25 \times 54^2

x^2 = \dfrac{25 \times 54^2}{24}

x =\sqrt{ \dfrac{25 \times 54^2}{24}}

x =\dfrac{5 \times 54}{\sqrt{24}}

x =\dfrac{270}{\sqrt{4 \times 6}}

x =\dfrac{45 \times 6}{ 2 \sqrt{ 6}}

x =\dfrac{45 \sqrt{6}}{ 2}

8 0
3 years ago
Pls help. I will name you branliest if the answer is correct. (Look at the picture)!!!!​
GREYUIT [131]
C because if it was constant then for day 3 the distance would be 65.4 instead of 64.8
8 0
2 years ago
Find the value c that completes the square for x^2-8x+c
Blababa [14]

Answer: 16

Step-by-step explanation:

x^2-8x+c

Let's complete the square.

c=(\frac{b}{2})^2

c=(\frac{-8}{2})^2

c=(-4)^2\\ c=16

7 0
3 years ago
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