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3 years ago

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Jayla buys and sells vintage clothing. She bought two blouses for $25.00 each later sold them for $38.00 each. She bought three

skirts for $15.00 each and later sold them for $26.00 each. She bought fuve pairs dor $30.00 each and later sold for 65.00 each.

1 answer:

kvasek [131]3 years ago

5 0

She spent $245 and made $479

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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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2 years ago

The circumference of a circle is 60 pi cm. What is the radius of the circle?

Ivenika [448]

Answer:

D

Step-by-step explanation:

The formula for the circumference of a circle is 2 $\pi$ r. So if we know that C=60 $\pi$ then we can trace our steps back. We are given that pi remains constant so we are left with the 2r from the formula and a 60. 60/2 =30.

The radius is 30cm

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2 years ago

I need help finding the domain and range of the graph shown. I put (infinity, 2) for the domain and it was wrong. I am not sure

Ede4ka [16]

The domain is $[-1,2)$ , while the range is $(0,4]$ .

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3 years ago

A line having a slope of 3/4 passes through the point (-8, 4). Write the equation of this line.

liubo4ka [24]

Answer:

4=3/4(-8)+b

Step-by-step explanation:

You have to use the equation Y=mx+b

M is your slope so 3/4

x=-8

Y=4

Then u put it into the equation and get 4=3/4(-8)+b

Hope this helps:)

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2 years ago

Read 2 more answers

Please help! whoever answers first ill make brainliest! good luck..

xxMikexx [17]

Answer:

A decimal in the wrong place can change the value of a number COMPLETELY!

Step-by-step explanation:

for example

0.4 can be converted to 40 cents or 2/5, but if you change the decimal 0.04 converts to 4% or 1/25.

hope this helps!

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2 years ago