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sveta [45]
3 years ago
13

Find the product: (x+9)(x-9) a 18 b. -81 C. - 18 d. x-64

Mathematics
2 answers:
Lilit [14]3 years ago
5 0

Answer:

x^2 -81

Step-by-step explanation:

(x+9)(x-9)

FOIL

first x*x = x^2

outer -9x

inner 9x

last -9*9 = -81

Add them together

x^2 -9x+9x -81

Combine like terms

x^2 -81

olga nikolaevna [1]3 years ago
4 0

Answer: B

Step-by-step explanation:

Simply using (a-b)(a+b)=a^2-b^2.

Evaluate the power (9^2).

x^2 - 81

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The resting heart rate of an adult is usually about 60 beats per minute. Use your completed table to find approximately how many
Fofino [41]

if 60 beats = 1 minute, and a minute is 60 seconds then 1,000,000 beats has to be divided by 60 = 16667 rounded to the nearest hundred thousand and divide that by 1440 (How many seconds in a day) = 11.574 days.


That equates to 11days, 13hours, 46 min, and 40 sec

4 0
3 years ago
Find the measure of an interior angle of a regular polygon with 6 sides. Round to the nearest tenth if necessary.
Andreyy89

Answer:

120

Step-by-step explanation:

180(6-2)/6

4 0
3 years ago
When you divide , we are
fomenos
Could you be a little more specific.
5 0
4 years ago
Read 2 more answers
Perform the operation 8-1/2+5-1/8
IrinaVladis [17]

Answer:

12.375 is believed to be the correct answer

7 0
4 years ago
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A Web music store offers two versions of a popular song. The size of the standard version is 2.4 megabytes (MB). The size of the
Margarita [4]

Answer:

880 high-quality version

Step-by-step explanation:

I think the below is your full question:

<em>A Web music store offers two versions of a popular song. The size of the standard version is 2.1megabytes (MB). The size of the high-quality version is 4.5 MB. Yesterday, there were 1290 downloads of the song, for a total download size of 4821 MB. How many downloads of the high-quality version were there?</em>

Here is my answer:

Let x is the number of high-quality version

So the number of standard version= 1290 - x

We also know:  total download size of 4821 MB. which means:

4.5x + 2.1(1290-x) = 4821

<=> 4.5x+2709-2.1x=4821

<=> 2.4x=2112

<=> x=880

So there were 880 high-quality version

5 0
3 years ago
Read 2 more answers
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