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3 years ago

May I please receive help?

Mathematics

1 answer:

ruslelena [56]3 years ago

5 0

Answer:

so you have to find angles

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GEOMETRY Find the perimeter of the regular polygon.<br> 3(x - 1)<br> 5x - 6

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7.5

Step-by-step explanation:

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3 years ago

Solve using the quadratic formula. Choose all the correct responses.<br> X^2+ 10x + 22 = 0

Andrew [12]

Answer:

$x2 = 1x2 = 9 \\$

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3 years ago

What is the answer of 1/2 x 2 1/3 =

OlgaM077 [116]

Answer:

7/6 or 1 1/6

Step-by-step explanation:

First convert 2 1/3 into just a normal fraction

2 1/3 = 7/3

Next set up the equation and multiply from left to right on both the top and bottom.

1/2 x 7/3 = 7/6

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3 years ago

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viva [34]

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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.

7 0

3 years ago