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2 years ago

I need an answer! NOT A LINK!!! ASAP!

Mathematics

2 answers:

Nonamiya [84]2 years ago

5 0

Answer:

im pretty sure its 14

Step-by-step explanation:

irinina [24]2 years ago

3 0

A is correct, 14 i think

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6. A tank contains 100-gallon of pure water. At time t = 0, a solution containing 2 lb of salt per gallon flows into the tank at

SOVA2 [1]

Answer:

The answer is below

Step-by-step explanation:

Let Q represent the amount of salt in the tank at time t.

$\frac{dQ}{dt}= flow\ in - flow\ out\\ \\flow\ in=3\ gal/min*2\ lb/gal=6\ lb/min\\\\net\ gain\ in\ tank\ volume=3-4=-1, henceflow\ out= \frac{4Q}{100-t} \\\\\frac{dQ}{dt}= 6-\frac{4Q}{100-t} \\\\\frac{dQ}{dt}+ \frac{4Q}{100-t}=6\\\\The \ integrating\ factor\ is:\\\\IF=e^{\int\limits {\frac{4}{100-t} } \, dt }=e^{-4\int\limits {\frac{-1}{100-t}}=e^{-4ln(100-t)}=(100-t)^{-4}}\\\\Multiplying\ through \ by\ IF: \\\\(100-t)^{-4}\frac{dQ}{dt}+ (100-t)^{-4}\frac{4Q}{100-t}=6(100-t)^{-4}\\\\$

$Integrating:\\\\A(100-t)^{-4}=-2(100-t)^{-3}+c\\\\A=-2(100-t)+\frac{c}{(100-t)^{-4}} \\\\at, t=0,A=0\\\\0=-2(100-0)+\frac{c}{(100-0)^{-4}}\\\\c=0.02\\\\A=-2(100-t)+\frac{0.02}{(100-t)^{-4}}$

7 0

2 years ago

What is Melissa’s original salary if she gets 4% increase in pay and is now getting $29,12? Round to the nearest dollar.

andre [41]

Answer:

Step-by-step explanation:

7 0

2 years ago

Some public goods and services are provided by the federal government, others by state governments, and still others by local ci

creativ13 [48]

Answer:

If this is supposed to be a math problem o think you messed up writing it

Step-by-step explanation:

7 0

2 years ago

Find the student’s error in solving the following inequality.

Leto [7]

Answer:

The student should have switched the direction of the inequality sign to

get –5 > x for a final answer.

Step-by-step explanation:

When multiplying or dividing an inequality by a negative "flip" the inequality sign

The student should have switched the direction of the inequality sign to

get –5 > x for a final answer.

---------------

Note:

For a more conventional appearance the entire inequality can be flipped to

–5 < x

6 0

2 years ago

3252614683754629158741032465x93756356872264881+432757232878247-3243566=

Paul [167]

Answer:

bout 7

Step-by-step explanation:

5 0

2 years ago

Read 2 more answers