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Troyanec [42]
3 years ago
15

Multiply (9x+2y)(9x-2y)

Mathematics
2 answers:
Gala2k [10]3 years ago
6 0

Hi there!

Here are all the steps into multiplying these 2 parentheses :

(9x + 2y) × (9x - 2y)

9x × 9x = <u>81x²</u>

9x × -2y = <u>-18xy</u>

2y × 9x = <u>18xy</u>

2y × -2y = <u>-4y²</u>


81x² - 18xy + 18xy - 4y²


-18xy + 18xy = 0


Your answer is: 81x² - 4y²


There you go! I really hope this helped, if there's anything just let me know! :)

Alex_Xolod [135]3 years ago
3 0
<h2>Answer- 81x² - 4y²</h2>

All the steps listed below

(9x + 2y) × (9x - 2y)

9x × 9x = 81x²

9x × -2y = -18xy

2y × 9x = 18xy

2y × -2y = -4y²

81x² - 18xy + 18xy - 4y²

-18xy + 18xy = 0


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ipn [44]

Answer:

a) $93, $117.80, $86.80, $68.20

b) $365.80

Step-by-step explanation:

a)

Add 12 hours to each p.m. time to make the subtraction of hours easier.

Also, use decimal numbers to do the subtraction. Remember that 0:30 means 30 minutes which is 0.5 hour, so 7:30 is the same as 7.5 as a decimal.

Monday: 8:00 to 15:30

15:30 - 8:00 = 1.5 - 8 = 7.5 hours

7.5 hours * $12.40/h = $93

Wednesday: 7:30 to 17:00

17:00 - 7:30 = 17 - 7.5 = 9.5 hours

9.5 hours * $12.40/h = $117.80

Friday: 9:00 to 16:00

16:00 - 9:00 = 16 - 9 = 7 hours

7 hours * $12.40/h = $86.80

Saturday: 10:30 to 16:00

16:00 - 10:30 = 16 - 10.5 = 5.5 hours

5.5 hours * $12.40/h = $68.20

b) Add all the daily amounts above.

$93 + $117.80 + $86.80 + $68.20 = $365.80

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3 years ago
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30

Step-by-step explanation:

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Answer:

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Step-by-step explanation:

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Subtract 5x from each side

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Add 10 to each side

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3 years ago
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