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vladimir1956 [14]
3 years ago
15

-70y^2+90x^3+100yx^2-63xyfactor by grouping

Mathematics
1 answer:
Alexeev081 [22]3 years ago
4 0
The idea of grouping is to get the terms in groups that allow you to factor out from each group something that becomes a factor in itself, leaving two factors behind that are alike. Like this: rearrange those terms so they are in this order:
(-70y^2 - 63xy) + (90x^3 + 100yx^2).  Now out of the first set we are going to factor out a -7y, and out of the second set we are going to factor out a 10x^2. When we do this, this is what we get: -7y(10y + 9x) + 10x^2(9x + 10y). As you can see, what's inside both sets of parenthesis is the same, just in a different order. We can factor that out now, leaving (9x + 10y)(10x^2 - 7y). And that is factored by grouping.
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Suppose that circles R and S have a central angle measuring 80°. Additionally, the measure of the sector for circle R is
riadik2000 [5.3K]
The correct answer is B) 9 m.

The measure of the sector of circle R is 32π/9 m.  The measure of the central angle is 80°.  This means that the sector is 80/360 = 2/9 of the circle.  The area of a circle is given by A=πr², so the area of the sector is A=2/9πr².  To verify this, 2/9π(4²) = 2/9π(16) = 32π/9.

Using this same formula for circle S, we will work backward to find the radius:

18π = 2/9πr²

Multiply both sides by 9:
18*9π = 2πr²
162π = 2πr²

Divide both sides by 2π:
162π/2π = 2πr²/2π
81 = r²

Take the square root of both sides:
√81 = √r² 
9 = r

6 0
3 years ago
Read 2 more answers
Ralph sold brownies for $0.66 a piece in order to earn money to buy baseball cards. If the cards cost $0.90 per pack, and if Ral
denpristay [2]
What is the rest of the question
5 0
2 years ago
Total liabilities of $5000000. Net worth balance4000000. Calculate the debt to worth ratio?
blagie [28]

Answer:

5/4 or   1   1/5

Step-by-step explanation:

remove the zeros and you get 5/4 or   1  1/5

7 0
3 years ago
Pls answer this with an explanation if you can pg3 pt12
faust18 [17]
With each gallon you need 11 gallons with 2 parts red 9 parts yellow and since 11x4= 44 you need to do this 4 times
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i hope this made sense
7 0
3 years ago
Help, I didn't get it
Alex17521 [72]
Sorry i don’t understand
7 0
2 years ago
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