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LenaWriter [7]
3 years ago
5

20 POINTS !!! ONLY HELP IF UR 100% SURE !!!

Mathematics
2 answers:
Arte-miy333 [17]3 years ago
8 0
Your answer is C for sure I am!
Olegator [25]3 years ago
8 0

Answer:

Step-by-step explanation:

initial 48,000

50% Decrease

Minnimum 94500

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Suppose a tank contains 400 gallons of salt water. If pure water flows into the tank at the rate of 7 gallons per minute and the
Strike441 [17]

Answer:

Step-by-step explanation:

This is a differential equation problem most easily solved with an exponential decay equation of the form

y=Ce^{kt}. We know that the initial amount of salt in the tank is 28 pounds, so

C = 28. Now we just need to find k.

The concentration of salt changes as the pure water flows in and the salt water flows out. So the change in concentration, where y is the concentration of salt in the tank, is \frac{dy}{dt}. Thus, the change in the concentration of salt is found in

\frac{dy}{dt}= inflow of salt - outflow of salt

Pure water, what is flowing into the tank, has no salt in it at all; and since we don't know how much salt is leaving (our unknown, basically), the outflow at 3 gal/min is 3 times the amount of salt leaving out of the 400 gallons of salt water at time t:

3(\frac{y}{400})

Therefore,

\frac{dy}{dt}=0-3(\frac{y}{400}) or just

\frac{dy}{dt}=-\frac{3y}{400} and in terms of time,

-\frac{3t}{400}

Thus, our equation is

y=28e^{-\frac{3t}{400} and filling in 16 for the number of minutes in t:

y = 24.834 pounds of salt

6 0
3 years ago
What does 9-20 equal
nordsb [41]
Did you mean 9 - 20 will if u did it equals up to -11
3 0
3 years ago
HELP URGENT!!!!
Vikki [24]
The equation should be y= -2x+5.
7 0
3 years ago
Which symbol makes the comparison true? 0.74 to 0.740
DENIUS [597]

Answer:

=

Step-by-step explanation:

6 0
2 years ago
FIND X AND Y. GIVING BRAINLIEST AND 100 POINTS
aksik [14]

Answer:

here u can look

Mark as brainlist

Step-by-step explanation:

X + y = 120(being alternate angle)

or,X=120-y

then

2x-y=120

or,2(120-y) - y= 120

240-2y-y=120

y=240-120

y= 120

again,

X=120-y

= 120-120

=0

hence,

X= 0

y= 120

6 0
2 years ago
Read 2 more answers
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