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3 years ago

Please help!! I’ll give brainliest also!! Thank you!!

Mathematics

1 answer:

yan [13]3 years ago

3 0

Answer:

let me see and ill let you know

Step-by-step explanation:

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Suppose that a large mixing tank initially holds 700 gallons of water in which 50 pounds of salt have been dissolved. another br

labwork [276]

$\dfrac{\mathrm dA}{\mathrm dt}=\dfrac{3\text{ gal}}{1\text{ min}}\dfrac{4\text{ lb}}{1\text{ gal}}-\dfrac{2\text{ gal}}{1\text{ min}}\dfrac{A\text{ lb}}{700+(3-2)t\text{ gal}}$
$\iff A'+\dfrac2{700+t}A=12$

$(700+t)^2A'+2(700+t)A=12(700+t)^2$
$((700+t)^2A)'=12(700+t)^2$
$(700+t)^2A=4(700+t)^3+C$
$A=4(700+t)+\dfrac C{(700+t)^2}$

Initially, the tank contains 50 lbs of salt in 700 gal of solution, i.e. $A(0)=\dfrac{50}{700}=\dfrac5{70}$ , so

$\dfrac5{70}=2800+\dfrac C{700^2}$

Use this to solve for $C$ .

8 0

3 years ago

The amount Troy charges to mow a lawn is proportional to the time it takes him to mow the lawn. Troy charges $30 to mow a lawn t

Marrrta [24]

Answer:

A. d = 20h

Step-by-step explanation:

Let the amount in dollars=d

Let the number of hours =h

Since the amount(d) Troy charges to mow the lawn is proportional to the time(h) it takes him to mow the lawn.

d=kh (k a variation constant)

Troy charges $30 to mow a lawn that took him 1.5 hours to mow.

d=$30, h=1.5 hrs

Substitution into the equation above gives:

30=k1.5

k=30/1.5=20

Substituting k=20 into the variation equation, we have:

d=20h

7 0

3 years ago

Simplify<br> x² - 9<br> ——————<br> x2 + x - 12

katrin [286]

( + 3)(x - 3)

(x + 4)(x-3)

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3 years ago

Write an expression that equals 40 include an exponent

Marina86 [1]

6^2 + 4=40

Hope this helps

4 0

3 years ago

Can someone find the slope please?

elena-14-01-66 [18.8K]

The answer is 3/1 which simplifies to 3, the reason it’s correct is because from the bottom dot you move up 3 and go over one, then simplify.

7 0

3 years ago