Water fills a tank at a rate of 150 litres during the first hour, 350 litres during the second, 550 litres during the third and so on. Find the number of hours necessary to fill a rectangular tank 16m x 7m x 7m.

Answers

Answer 1

Answer: Putting this as an arithmetic sequence gives:

$u_n = 150+200(n-1)$

The sum of the series = 16 x 7 x 7 = 784 m^3 = 784 000 L

The sum of an arithmetic series can be written as:

$S_n=n/2 [2a+(n-1)d] = 784 000\nn/2[2(150)+(n-1)200] = 784 000\nn[300+200(n-1)=1 568 000\n300n+200n^2-200n = 1 568 000\n200n^2+100n- 1 568 000 = 0\n2n^2 +n- 15680 = 0\nn= 88.2...,-88.7$

n has to be positive, so we get

n = 88.2 hours (3 s.f.)

Answer 2

Answer: Volume of tank = (16m)(7m)(7m) = 784 m³

Conversion of m³ to L:
(784 m³) × (1000L / 1m³) = 784,000 L

Rate in the 1st hour:
150 liters/hr

Rate in the 2nd hour:
350 liters/hr

Rate in the 3rd hour:
550 liters/hr

It is apparent that the Fill Rate is increasing by 200 liters/hr every subsequent hour . . . so that can be represented by the following equation

where:
t = number of hours

Fill rate (i.e. volume of water filled into tank within the specified hour) = 150 + 200(t - 1)

For t = 1 . . . Fill rate = 150 L/hr
For t = 2 . . . Fill rate = 350 L/hr
For t = 3 . . . Fill rate = 550 L/hr

Because after every hour there has been more water added to the tank, this problem can be represented as a geometric sequence in order to account for the compounding of the volume after each time step, but it can also be tabulated (which seems to me to be the more direct/simple approach), so I will build a table that accounts for the increasing Fill Rate and the compounding of water volume after each time step . . .

(see attached)

The answer (after all of this) is . . . t = 88 hrs 17 1/2 mins (approx)

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Ten weeks ago Jerry bought stock at 211/2
; today the stock is valued at 203
/8
. We could say the stock
is performing at which of the following?
A. On par
B. Par equality
C. Below par
D. Above par

Answers

Since 211/2 = 105.5 and 203/8 = 25.375, it is quite clear that Jerry has lost money on this stock. So the correct answer is C. Below par.

Answer:

(c) Below par

Step-by-step explanation:

Ratio at which stock is bought = 211/2

= 105.5

Therefore, the par value = 105.5

Recent ratio of stock = 203/8

= 25.375

Value of stock today = 25.375

Since the ratio is decreased Hence, the value of stock is below par value.

What is -9/20 as a decimal and as a percent?

Answers

Decimal: -0.45 percent:-45%

To find out what a fraction as a decimal would be, you simply need to divide the numerator by the denominator.

$(-9)/(10) = -9/10=-0.9$

Now to find the percent.
To find a percentage based off of a decimal, we can either multiply the decimal by 100, or (my personal shortcut) just shift the decimal point over two places to the right.

-0.9 = -90%

which is all we need to know.

$(-9)/(10)$ written as a decimal and a percent is -0.9 and -90% respectively.
Hope that helped! =)

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