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Arturiano [62]
3 years ago
9

you're in mechanic you have been given an engine repair job that has a job time of 0.7 hour. about how many minutes should you a

llow for the job?
Mathematics
2 answers:
yKpoI14uk [10]3 years ago
7 0

Answer:

42 minutes

Step-by-step explanation:

To find the number of minutes, we multiply the portion of an hour by 60:

0.7(60) = 42

guapka [62]3 years ago
5 0
You should be getting paid way more then that
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Suppose that a large mixing tank initially holds 400 gallons of water in which 70 pounds of salt have been dissolved. Pure water
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Answer:

Step-by-step explanation:

Given that a large mixing tank initially holds 400 gallons of water in which 70 pounds of salt have been dissolved. Pure water is pumped into the tank at a rate of 4 gal/min, and when the solution is well stirred, it is then pumped out at the same rate.

Let Q(t) be the quantity of salt at time t.

Q(0) = 70 pounds

Inflow of water = outflow = 4 gal/min

So resulting volume of tank at time t = 400 gallons

Rate of change of salt = inflow - outflow

= 0 - \frac{Q(t)}{400}

i.e. \frac{dQ}{dt} =\frac{-Q(t)}{400}

This is a variable separable equation

\frac{dQ}{Q}=-\frac{dt}{400} \\ln Q = {-\frac{t}{400}} +C\\Q = A e^{-\frac{t}{400}}

Use when t =0 Q = 70

A =70

So A(t) = Q(t) = 70 e^{-\frac{t}{400}} and

A(0) = Q(0) = 70 lbs.

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2 years ago
Triangles ABD and ACE are similar right triangles. which ratio best explains why the slope of AB is the same as the slope of AC
sertanlavr [38]
B. AC/EA = AB/DA because theyre equal slopes just different sizes
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3 years ago
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Divide $1.30 by 8 and round the quotient to the neatest cent.
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Step-by-step explanation:

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Answer:

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Step-by-step explanation:

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