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2 years ago

Giving away the last of my points :( please answer these two questions

Mathematics

2 answers:

o-na [289]2 years ago

8 0

Answer:

i think it a and c

Step-by-step explanation:

if i'm wrong sorry bout that i was just trynna help.since ur giving away ur last points u can go to my account and anwer my questions u dont have to give me the right answer or anything i promise i wont report u just do that and you can get mote points :)

makkiz [27]2 years ago

6 0

Answer:

i think your answer is c

Step-by-step explanation:

heres song to remember

weeee will never ever, ever ( add subtract which ever fits best) denominators weee will never ever, ever ( add and subtract ) denominators.

the first one is adding ( wrong)

the second one the number is more than it should be ( wrong)

the third may be its most simplified form ( may be correct )

the fourth same as the second one just the 3 is only simplified. hope its right! :) have a great day! hope you get some points!

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3 years ago

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A welder drops a piece of red-hot steel on the floor. The initial temperature of the steel is 2,500 degrees Fahrenheit. The ambi

sergey [27]

Answer: After 18.05 minutes, the temperature of steel becomes 100 degrees.

Step-by-step explanation:

Since we have given that

Initial temperature = 2500

At t = 0,

we get that

$f(t)=Ce^{-kt}+80\\\\2500=C+80\\\\2500-80=C\\\\2420=C$

After 2 minutes, the temperature of the steel is 1500 degrees.

so, it becomes,

$1500=2420e^{-2k}+80\\\\1500-80=2420e^{-2k}\\\\\dfrac{1420}{2420}=e^{-2k}\\\\0.587=e^{-2k}\\\\\ln 0.587=-2k\\\\-0.533=-2k\\\\k=\dfrac{0.533}{2}\\\\k=0.266$

So, We need to find the number of minutes when the temperature of steel would be 100 degrees.

So, it becomes,

$100=2420e^{-0.266t}+80\\\\100-80=2420e^{-0.266t}\\\\20=2420e^{-0.266t}\\\\\dfrac{20}{2420}=e^{-0.266t}\\\\\ln \dfrac{20}{2420}=-0.266t\\\\-4.8=-0.266t\\\\t=\dfrac{4.8}{0.266}\\\\t=18.05$

Hence, after 18.05 minutes, the temperature of steel becomes 100 degrees.

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Answer:

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Step-by-step explanation:

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amm1812

Answer:

Step-by-step explanation:

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sin(24) = x/9

x = 3.7

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