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g100num [7]
3 years ago
9

Which of these expressions is not equivalent to the others?

Mathematics
1 answer:
just olya [345]3 years ago
4 0
Normally You would need to simplify all of them, to see what their values are like.

Already from the start, however, we can see that 9n + 3 + 2 and 9n + 11 isnt the same value. Based on this, we should only need to simplify one of the other, to get either 9n + 5 or 9n + 11.

Lets pick the upper one.

(4n + 3) + 5n + 8 - 6
4n + 3 +5n + 2
9n + 5.

This indicated that 9n+11 is the odd one.

To make sure, we can solve the next one:
(4n + 5n) + (3 + 8 - 6)
9n + 5
Which indicated the same thing.

9n+11 is the "outsider", which means:

9n + 11 is the correct answer for this task.

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Grace can read 840 words in 7 minutes. At that rate, how many words can she read in one hour
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Answer:

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Step-by-step explanation:

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3 years ago
Express in Simper Fom : y-x
AveGali [126]
Simplify

E=\dfrac{\frac{x}{y}-\frac{y}{x}}{\frac{1}{y}+\frac{1}{x}}


Conditions for the existance of E:

x\neq 0~~\text{ and}~~y\neq 0~~\text{ and }~~x\neq -y.

(otherwise, the one of the denominators would be zero.)
____________________

Simplifying:

E=\dfrac{\frac{x}{y}-\frac{y}{x}}{\frac{1}{y}+\frac{1}{x}}


Multiply both the numerator and the denominator by xy:

E=\dfrac{xy\cdot \left(\frac{x}{y}-\frac{y}{x} \right )}{xy\cdot \left(\frac{1}{y}+\frac{1}{x} \right )}\\\\\\ E=\dfrac{\frac{xy\cdot x}{y}-\frac{xy\cdot y}{x}}{\frac{xy}{y}+\frac{xy}{x}}\\\\\\ E=\dfrac{x^{2}-y^{2}}{x+y}\\\\\\ E=\dfrac{(x+y)(x-y)}{x+y}


Simplify common factors:

E=x-y\\\\\\ \therefore~~\boxed{\begin{array}{c}\dfrac{\frac{x}{y}-\frac{y}{x}}{\frac{1}{y}+\frac{1}{x}}=x-y \end{array}}

6 0
3 years ago
Solve x+12/x+4=×/x+8
Morgarella [4.7K]
Cross multiply...
Thus,
x(x+4)=(x+12)(x+8)
expand...
x^2+4x=x^2+8x+12x+96
Simply both sides of the equation.
x^2+4x=x^2+20x+96
simply further by adding ask like terms...
-16x=96
Solve for x by making x the subject.
therefore
x=-6.
3 0
3 years ago
What two numbers have a sum of 24 and have a quotient of 3?
gogolik [260]
1st number is x
then the other will be 3x
3x+x=24
4x=24
x=6-first number
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7 0
3 years ago
Read 2 more answers
Use a net to find the surface area of the prism.
BartSMP [9]

Surface Area= Length × hypotenuse+ length × width+2(1/2 base × height)+Lenght×base

Surface Area= 19×25+19×7+24×7+19×24

SA=1232 m²
8 0
3 years ago
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