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3 years ago

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This year it snowed on five of the 12 days of Christmas the snow amounts were 3 inches ,5 inches ,7 inches ,1 foot and 9 inches

. What was the mean amount of snow for the 12 days ? Round your answer to the nearest hundredth of an inch

1 answer:

atroni [7]3 years ago

4 0

Answer:

Step-by-step explanation:

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Please guys please pllease

klio [65]

${ \qquad\qquad\huge\underline{{\sf Answer}}}$

Here we go ~

Let's calculate its discriminant :

$\qquad \sf \dashrightarrow \: 4 {u}^{2} + 16u + 41 = 40$

$\qquad \sf \dashrightarrow \: 4 {u}^{2} + 16u + 41 - 40 = 0$

$\qquad \sf \dashrightarrow \: 4 {u}^{2} + 16u + 1 = 0$

Here, if we equate it with general equation,

a = 4

b = 16

c = 1

$\qquad \sf \dashrightarrow \: disciminant = {b}^{2} - 4ac$

$\qquad \sf \dashrightarrow \: d = (16) {}^{2} - (4 \times 4 \times 1)$

$\qquad \sf \dashrightarrow \: d = (16) {}^{2} - (16)$

$\qquad \sf \dashrightarrow \: d = 16(16 - 1)$

$\qquad \sf \dashrightarrow \: d = 16(15)$

$\qquad \sf \dashrightarrow \: d = 240$

Now, since discriminant is positive ; it has two real roots ~

The roots are :

$\qquad \sf \dashrightarrow \: u = \dfrac{ - b \pm \sqrt{ d } }{2a}$

$\qquad \sf \dashrightarrow \: u = \dfrac{ - 16\pm \sqrt{ 240 } }{2 \times 4}$

$\qquad \sf \dashrightarrow \: u = \dfrac{ - 16\pm 4\sqrt{ 15 } }{8}$

$\qquad \sf \dashrightarrow \: u = \dfrac{ 4(- 4\pm \sqrt{ 15 }) }{8}$

$\qquad \sf \dashrightarrow \: u = \dfrac{ - 4\pm \sqrt{ 15 } }{2}$

So, the required roots are :

$\qquad \sf \dashrightarrow \: u = \dfrac{ - 4 - \sqrt{ 15 } }{2} \: \: and \: \: \dfrac{ - 4 + \sqrt{15} }{2}$

4 0

2 years ago

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Please help thank you.

Scrat [10]

Area = PI x r^2

r = 1/2 d = 1/2* 4.1 = 2.05

2.05^2 = 4.2025

answer is 4.2025PI m^2

Answer is D

7 0

3 years ago

Max, Alex, and Sam want to go to the movies. They have $40. Tickets costs $14. Do they have enough money for all of them to go?

muminat

No.
explanation ; 14*3=42

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3 years ago

20% of 70000000 20% of 70 million

SpyIntel [72]

20% of 70mil. is 14mil.

3 0

3 years ago

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Simplify and place the rounded answer on the top line

atroni [7]

1) round to 3
2) round to 4
3) round to 7
4) round to 6

4 0

3 years ago