3 years ago

Please Help 45 Points

Mathematics

1 answer:

enot [183]3 years ago

6 0

Answer:

Step-by-step explanation:

it's either a or c hoped i helped

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Find the distance between a and b. a = 9.21, b = –5.51

cricket20 [7]

9.21 - (-5.51)
9.21 + 5.51 = 14.72
The distance is 14.72

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3 years ago

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Which of the following is a perfect square trinomial?

shutvik [7]

Answer:

Step-by-step explanation:

Take a look at what happens when squaring either of these...

$(ax-by)^2=(ax-by)(ax-by)=a^2x^2-2abxy+b^2y^2\\\\(ax+by)^2=(ax+by)(ax+by)=a^2x^2+2abxy+b^2y^2\\$

Notice a couple of patterns.

1. The last term has a positive coefficient. That rules out answer choices C and D.

2. The coefficient of the middle term is either $+2ab \text{ or } -2ab$ . So what are a and b? a is the square root of the x^2 term and b is the square root of the y^2 term.

$25x^2 \Rightarrow a=5\\\\9y^2 \Rightarrow b=3\\\\ab=15\\\\2ab=30$

The middle coefficient needs to be either +30 or -30. The answer is choice A.

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3 years ago

3x+1/5 y= 7 solve for x

TiliK225 [7]

X = -1/15y+7/3

I hope this helps! :>

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M<1= (2x + 7y) degrees and m<2= (2x+y) degrees find x and y

Romashka-Z-Leto [24]

Do you have a picture for this problem? There are multiple different ways to solve this problem but I'll need a picture to help you.

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3 years ago

Lots of point up for grabs

Burka [1]

Minus a from both sides
x-a=-2by²
times both sides by -1
a-x=2by²
divide both sides by 2b
$\frac{a-x}{2b}=y^2$
sqrt both sides
$y= \sqrt{\frac{a-x}{2b}}$

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