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Andrej [43]
3 years ago
8

Following solutions to this equation?

Mathematics
1 answer:
Alekssandra [29.7K]3 years ago
3 0

Answer:

Step-by-step explanation:

hello :

x²+6x+9 = 20

(x+3)²-20 = 0

(x+3)²-√20 = 0

(x+3-√20)(x+3+√20)=0

x+3-√20=0   or    x+3+√20=0

x = -3+√20   or x = -3-√20    answer  B

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HELPPPP!!!<br> Select the correct answer.<br> Which function is an even function?
jonny [76]

Answer:

C.

Step-by-step explanation:

p(x)=sin(x) is an odd function since sin(-x)=-sin(x).

q(x)=cos(x) is an even function since cos(-x)=cos(x).

r(x)=tan(x) is an odd function since tan(-x)=-tan(x).

s(x)=csc(x) is an odd function since csc(-x)=-csc(x).

So the only contender seems to be C.

Let's check.  To check we have to plug in (-x) in place of (x) and see if we get the same function back since we are looking for an even function.

f(x)=\cos(\frac{5\pi}{4}x)

Replace (x) with (-x):

f(-x)=\cos(\frac{5\pi}{4}(-x)

f(-x)=\cos(\frac{-5\pi}{4}x)

f(x)=\cos(\frac{5\pi}{4}x) since cosine is even; that is cos(-u)=cos(u) where u in this case is \frac{5\pi}{4}x.

So f is even.

7 0
3 years ago
−10x + 1 + 7x = 37 i need the answers for that
vaieri [72.5K]
-10x+7x=-3x
3x+1=37
(-1) (-1)
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4 0
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A stack of 9 different cards are shuffled and spread out face down. If 4 cards are tired face up, how many different 4-card comb
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Answer:

126.

Step-by-step explanation:

This is the number of combinations of 4 cards  from 9 cards:

= 9C4

= 9! / 4! 5!.

A quick way of calculating this is  

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7 0
3 years ago
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Dvinal [7]

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Step-by-step explanation: 24 • 8

4 0
3 years ago
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erastova [34]

Answer:

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Step-by-step explanation:

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Combining these two inequalities, we have ...

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My truck's capacity is greater than 1800 +600 = 2400 pounds. This is a lower limit. The question asks for an <em>upper limit</em>. The given conditions do not place any upper limit on truck capacity.

4 0
3 years ago
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