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LUCKY_DIMON [66]
2 years ago
15

What is the answer to 1/2 divided by 1 3/4 ?

Mathematics
1 answer:
cupoosta [38]2 years ago
7 0

Answer:

2 1/4

Step-by-step explanation:

1 3/4 = 7/4

1/2 + 7/4

1/2/=2/4

2/4 + 7/4  =9/4

= 2 1/4

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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
Setler79 [48]

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
What type of polygon is shown
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2 years ago
Find the value of x that makes m||n. (7x - 23) (11x + 23)
umka2103 [35]

(7x - 23)° + (11x + 23)° = 180°

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Read 2 more answers
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The solution is X=10.

8 0
3 years ago
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