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Juliette [100K]
3 years ago
10

Which expression is equivalent to: (x +9)(x+3)

Mathematics
2 answers:
Serga [27]3 years ago
7 0

Answer:

C

Step-by-step explanation:

To solve use the FOIL method, First, Outside, Inside, Last. This means to multiply the first terms, the ones on the outsides, the ones on the insides, and finally the last ones.

First, multiply x*x= x^{2}

Then, multiply x*3= 3x

Next, multiply 9*x= 9x

Finally, multiply 9*3= 27

To simplify put all of the products together, x^{2}+3x+9x+27, then add like terms x^{2}+12x+27, so the answer is C.

labwork [276]3 years ago
6 0

Answer:

c

Step-by-step explanation:

x*x=x^2

x*9=9x

x*3=3x

9x+3x=12x

9x3=27

x^2+12x+27

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three friends earned more then $200 washing cars. they paid their parents $28 for supplies and divides the rest of money equally
Allushta [10]
X is each friend
3x + 28 > 200
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x > $57.33
5 0
3 years ago
It costs $2.50 per square meter to build a deck. how much will it cost to build a deck?​
natta225 [31]

Answer:

The drawing is a little hard to see.

Step-by-step explanation:

Basically you just multiply 2.50 by the other factor.

5 0
2 years ago
When two computers are working together, they can finish updating software in 9 minutes. How long would they take individually t
tensa zangetsu [6.8K]
First computer takes x min. For 1 min it does 1/x part of work.

Second computer takes (x+24) min. For one min it does 1/(x+24) part of work.

Both computers for one min do   (1/x+1/(x+24)) part of work.

At the same time, both computers for one min do 1/9 part of work.

\frac{1}{x} + \frac{1}{x+24} = \frac{1}{9} 
\\ \\  \frac{x+24+x}{x(x+24)} =  \frac{1}{9} 
\\ \\9(2x+24)=x^{2} +24x
\\ \\ 18x+216=x^{2} +24x
\\ \\ x^{2}+6x-216=0
\\ \\ D=b^{2}-4ac=36+4*216 = 900
\\ \\ x= \frac{-b+/- \sqrt{D} }{2a}  =  \frac{-6+/-30}{2} 
\\ \\ x_{1}=-18, x_{2}=12

We can use only positive number here. So, 

for the first computer x=12 min,

 for second computer x+24=12+24= 36 min

Answer 12 min and 36 min.


7 0
4 years ago
A circle has a circumfrence of 14mm. Find its area. Give an exact answer
lys-0071 [83]

Answer:

Inner circumference = 14*pi mm

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
An identification code is to consist of 3 letters followed by 3 digits. Determine the following
Free_Kalibri [48]

Answer:

3 letters can be arranged in 26*25*24 = 15600 ways

3 digits can be arranged in 10 * 9 * 8 = 720 ways

So the total number is 15600 * 720 = 11,232,000

So I agree with the number that you obtained

4 0
3 years ago
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