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3 years ago

What 9+10 don't say 21

Mathematics

2 answers:

Yanka [14]3 years ago

6 0

Answer:

Step-by-step explanation:

It's 19

just add 9 to 10

torisob [31]3 years ago

5 0

19

Hope this helped!!!

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28 is 12 less than k. k=?

maw [93]

Answer:

Step-by-step explanation:

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3 years ago

Prove that: (a2 - b2)3 + (b2-c2)3+ (c2-a2)3 = 3 (a+b) (b+c) (c+a) (a-b) (b-c) (c-a).

Vanyuwa [196]

$L=(a^2-b^2)^3+(b^2-c^2)^3+(c^2-a^2)^3=(*)\\\\(a^2-b^2)^3=a^6-3a^4b^2+3a^2b^4-b^6\\\\(b^2-c^2)^3=b^6-3b^4c^2+3b^3c^4-c^6\\\\(c^2-a^2)^3=c^6-3c^4a^2+3c^2a^4-a^6\\\\(*)=a^6-3a^4b^2+3a^2b^4-b^6+b^6-3b^4c^2+3b^2c^4-c^6+c^6-\dots\\\dots-3c^4a^2+3c^2a^4-a^6\\\\=-3a^4b^2+3a^2b^4-3b^4c^2+3b^2c^4-3c^4a^2+3c^2a^4\\\\=3(-a^4b^2+a^2b^4-b^4c^2+b^2c^4-a^2c^4+a^4c^2)$

$R=3(a+b)(a-b)(b+c)(b-c)(c+a)(c-a)\\\\=3(a^2-b^2)(b^2-c^2)(c^2-a^2)\\\\=3(a^2b^2-a^2c^2-b^4+b^2c^2)(c^2-a^2)\\\\=3(a^2b^2c^2-a^4b^2-a^2c^4+a^4c^2-b^4c^2+a^2b^4+b^2c^4-a^2b^2c^2)\\\\=3(-a^4b^2+a^2b^4-b^4c^2+b^2c^4-a^2c^4+a^4c^2)\\\\L=R$

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3 years ago

Read 2 more answers

Does anyone know how to do this?? thanks x

Gre4nikov [31]

There's a simple formula for the area of an ellipse: pi*a*b, where a and b are , half the lengths of the long axis and the short axis respectively.

Here, A = pi*(12 ft)(4 ft) = 48 pi ft^2, or about 150.8 ft^2.

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3 years ago

He difference of 29 and n

almond37 [142]

Answer:

Step-by-step explanation:

n can be represented as 1.

29 - 1 = 28

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2 years ago

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A bottle of liquid cleaner contains 120 fluid ounces. If one wash load requires 4 ounces of the detergent, how many washes can

Trava [24]

Answer:

Step-by-step explanation:

120/4 = 30

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4 years ago