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shtirl [24]
2 years ago
7

6cos(20πt-π)+6√3cos(20πt-π\2)

Mathematics
1 answer:
juin [17]2 years ago
5 0

Answer:

<u>Answer</u><u> </u><u>is</u><u> </u><u>-</u><u>6</u><u>t</u>

Step-by-step explanation:

{ \tt{ = (6 \cos(20\pi t)  \cos(\pi)  +  6\sin(20\pi t) \sin(\pi) ) + 6 \sqrt{3} ( \cos(20\pi t)  \cos( \frac{\pi}{2} )  +  \sin(20\pi t)   \sin( \frac{\pi}{2} )) }} \\  = { \tt{ (- 6t + 0) + (0 + 0)}} \\  = { \tt{ - 6t}}

Note that π is 180°

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C.P.=Rs 400, LOSS=5%, S.P=Rs X, S.P.=C.P.-5% OF C.P, FIND S.P. (STEP BY STEP PLZ)​
balu736 [363]

s.p. = c.p. \times 5\% \\ or \: x = 400 \times 5 \div 100 \\ or \: x = 4 \times 5 = 20 \\

6 0
3 years ago
During one hour at an amusement park, 20 guests bought only day passes, 60 guests
Goshia [24]

Answer:

the percentage of these 120 guest purchase only day passes is 16.67%

Step-by-step explanation:

The computation of the percentage of these 120 guest purchase only day passes is shown below

= Number of guests purchased only day passes ÷ Given guest

= 20 ÷ 120 guest

= 16.67%

Hence, the percentage of these 120 guest purchase only day passes is 16.67%

We simply applied the above formula so that the correct value could come

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2 years ago
Find the sum: 11 + 15 + 19 + .......+ 83
bonufazy [111]

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6 0
2 years ago
Income tax returns show that the mean income of self-employed persons in a particular year was £15,000, with a standard deviatio
DochEvi [55]

Answer:

Yes, There is significant difference.

Step-by-step explanation:

Null Hypothesis , H0 : Mean income = 15000

Alternate Hypothesis , H1 : Mean income  ≠  15000

t = (x - u) / ( s / √n)

x = sample mean = 14500 here, u = population mean = 15000 here ,             s = standard deviation =  975 here  , n = sample size

t = (14500 - 15000) / (975 / √169)

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As  calculated t value in absolute terms is > 1.96 , ie tabulated value at 95% significance level (two sided). So we reject the null hypothesis in favor of alternate hypothesis. Hence, we state that 'Mean Income ≠  15000'

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3 years ago
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Answer:

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X>-15( since -15 is lesser than -14,-13,-12 and so on. the sign should be >

6 0
2 years ago
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