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Taya2010 [7]
2 years ago
14

Solve for x (X+1)(x+5)=(x+3)(x-1)

Mathematics
2 answers:
Roman55 [17]2 years ago
5 0

Answer: x=−2

Step-by-step explanation:

Harlamova29_29 [7]2 years ago
4 0

Answer:

x = -2

Step-by-step explanation:

x^2 + 6x + 5 = x^2 + 2x - 3

x^2 + 6x = x^2 + 2x - 8

4x = -8

x = -2

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If a dozen people get on a train, and five of them get off at the next stop, how many of those people are left on the train?
kozerog [31]
1 dozen = 12
5 get off the next stop so
12 - 5 =
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7 0
3 years ago
Newton's law of cooling is:
Mnenie [13.5K]

Answer:

t = \frac{ln(\frac{21}{59})}{-0.15}=6.887 hr

So it would takes approximately 6.9 hours to reach 32 F.

Step-by-step explanation:

For this case we have the following differential equationÑ

\frac{du}{dt}= -k (u-T)

We can reorder the expression like this:

\frac{du}{u-T} = -k dt

We can use the substitution w = u-T and dw =du so then we have:

\frac{dw}{w} =-k dt

IF we integrate both sides we got:

ln |w| = -kt +C

If we apply exponential in both sides we got:

w = e^{-kt} *e^c

And if we replace w = u-T we got:

u(t)= T + C_1 e^{-kt}

We can also express the solution in the following terms:

u(t) = (T_i -T_{amb}) e^{kt} +T_{amb}

For this case we know that k =-0.15 hr since w ehave a cooloing, T_{i}= 70 F, T_{amb}=11F, we have this model:

u(t) = (70-11) e^{-0.15t} +11

And if we want that the temperature would be 32F we can solve for t like this:

32 = 59 e^{-0.15 t} +11

21=59 e^{-0.15 t}

\frac{21}{59} = e^{-0.15 t}

If we apply natural logs on both sides we got:

ln (\frac{21}{59}) =-0.15 t

t = \frac{ln(\frac{21}{59})}{-0.15}=6.887 hr

So it would takes approximately 6.9 hours to reach 32 F.

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3 years ago
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2 years ago
unit 1 chapter 1 gross income answersA portion of Donald Irwin’s time sheet is shown below. Determine the total number of hours
statuscvo [17]

Answer:

i need points

Step-by-step explanation:

7 0
2 years ago
Find the area of a square if each side is 11 centimeters long
valentinak56 [21]
The area of that square would be 121 cm^2 because :

area of square = length(width)
                         =  11(11) 
                         = 121
Then you also have to square the units(cm). So the final answer would be 121 cm^2                        (the " ^ "represents the exponentiation) 
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3 years ago
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