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Natalija [7]
3 years ago
10

Can someone please help solve this, I have no idea

Mathematics
1 answer:
Snowcat [4.5K]3 years ago
5 0

use math-

Step-by-step explanation:

-way! the best at solving problems just like this one!

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Teh answer is c just make the 20% into 0.2 then times 0.2 by 30 and you will get cost of the sweater

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A battery has enough energy to operate eight toy bears for 21 hours. For how long could the battery operate 15 toy bears?
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28 hours for 15 toy bears

Step-by-step explanation:

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HELP NEEDED!! QUESTION BELOW
Cerrena [4.2K]

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A

Step-by-step explanation:

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3 years ago
Consider the function on the interval (0, 2π). f(x) = 7 sin2(x) + 7 sin(x) (a) Find the open interval(s) on which the function i
-BARSIC- [3]

Answer with Step-by-step explanation:

Given

f(x)=7sin(2x)+7sin(x)

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14cos(2x)+7cos(x)=f'(x)

Now we know that for an increasing function we have

f'(x)>0\\\\14cos(2x)+7cos(x)>0\\\\2cos(2x)+cos(x)>0\\\\2(2cos^{2}(x)-1)+cos(x)>0\\\\4cos^{2}(x)+cos(x)-2>0\\\\(2cos(x)+\frac{1}{2})^2-2-\frac{1}{4}>0\\\\(2cos(x)+\frac{1}{2})^2>\frac{9}{4}\\\\2cos(x)>\frac{3}{2}-\frac{1}{2}\\\\\therefore cos(x)>\frac{1}{4}\\\\\therefore x=[0,cos^{-1}(1/4)]\cup [2\pi-cos^{-1}(1/4),2\pi ]

Similarly for decreasing function we have

[tex]f'(x)

Part b)

To find the extreme points we equate the derivative with 0

f'(x)=0\\\\cos(x)=\frac{1}{4}\\\\x=cos^{-1}(\frac{1}{4})

Thus point of extrema is only 1.

4 0
4 years ago
H(x)=x2+2x g(x)=-2x+4 Find(h-g)(x)<br> O x2+3x+1<br> O x2+4x-4<br> O x2-4x-4<br> O -x2-4x+4
maria [59]

Answer:

Step-by-step explanation:

x^2 + 2x + 2x - 4

x^2 + 4x - 4

Option 2 is the answer

8 0
4 years ago
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