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Nadusha1986 [10]
3 years ago
15

Please guys. Would bless you

Mathematics
1 answer:
natima [27]3 years ago
8 0

Answer:

10 hours

Step-by-step explanation:

volume of lower portion = 85x125x40 = 425,000

volume of upper portion = 20x30x125 = 75,000

in 1.5 hours, the pump removed 75,000

in one hour it removed 50,000     (75000/1.5 = 50,000)

425,000 / 50,000 = 8.5 hours for bottom portion

8.5 + 1.5 = 10 hours total time for top and bottom

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What is f(–3) for the function f(a) = –2a2 – 5a + 4?
lyudmila [28]

f(a) = –2a2 – 5a + 4

f(–3)

Replace a with -3:

-2(-3)^2 -5(-3) +4=

-2(9) +15 +4 =

-18 + 19 = 1

5 0
4 years ago
It's easy it's called Two-way tables please help
Vesnalui [34]

Answer: The filled out table is shown below in the attached image

===========================================================

Explanation:

The letters A through J are one way to fill out the table. Though there are other possible orders.

Start at letter A, which is from the fact we have 40 people total

Then move to letter B. This is the total number who like pasta (26)

We have C = A-B = 40-26 = 14 people who don't like pasta

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

Now move to cell D. This is the total who don't like netball, which is 21 people. There are E = A-D = 40-21 = 19 people who do like netball.

F = 4 is the number of people who don't like either thing (netball or pasta). So G = D-F = 21-4 = 17 people like pasta but don't like netball.

Of those people who like netball (E = 19), we have 9 who also like pasta. This is in cell H in the upper left corner. This means J = E-H = 19-9 = 10 people like netball but don't like pasta.

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

So we have these values

  • A = 40
  • B = 26
  • C = 14
  • D = 21
  • E = 19
  • F = 4
  • G = 17
  • H = 9
  • J = 10

7 0
3 years ago
A cab charges the following fare for each trip.
trasher [3.6K]

Answer:

$9.78

Let's be honest, you only need an answer right?

6 0
3 years ago
Use the given level of confidence and sample data to construct a confidence interval for the population proportion p.
Molodets [167]

Answer:

The 95% confidence interval for the population proportion is (0.778, 0.884).

Step-by-step explanation:

We have to calculate a 95% confidence interval for the proportion.

The sample proportion is p=0.831.

 

The standard error of the proportion is:

\sigma_p=\sqrt{\dfrac{p(1-p)}{n}}=\sqrt{\dfrac{0.831*0.169}{195}}\\\\\\ \sigma_p=\sqrt{0.00072}=0.027

The critical z-value for a 95% confidence interval is z=1.96.

The margin of error (MOE) can be calculated as:

MOE=z\cdot \sigma_p=1.96 \cdot 0.027=0.053

Then, the lower and upper bounds of the confidence interval are:

LL=p-z \cdot \sisgma_p = 0.831-0.053=0.778\\\\UL=p+z \cdot \sisgma_p = 0.831+0.053=0.884

The 95% confidence interval for the population proportion is (0.778, 0.884).

8 0
4 years ago
Help ASAP !!!!!!!!!!!!!!!!!!
kogti [31]

Answer:

i cant really see what it says but i think its 2- by 4

Step-by-step explanation:

6 0
3 years ago
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