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Leviafan [203]
2 years ago
12

4 boys have a mean height of 162cm.Another boy with a height of 165cm joins them.What is the new mean height?

Mathematics
1 answer:
Marina CMI [18]2 years ago
7 0

Answer: 162.6cm

Step-by-step explanation:

4 boys have a mean height of 162cm. Their total height will be the average multiplied by the number of boys which will be:

= 162 × 4

= 648cm

A new boy with height of 165cm joined. This means that we now have 5 boys and their total height will be:

= 648cm + 165cm

= 813cm

The new mean height will be:

= Total height / Number of boys

= 813 / 5

= 162.6cm

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0.525 =  \frac{525}{1000}  =  \frac{21}{40}
Divide 525/1000 by 25
7 0
3 years ago
What is the remainder when the polynomial 7x^2+15x-2 is divided by x+3
andrey2020 [161]
Simplify each term.
7x^2 + 15x - 2/x + 3
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3 0
3 years ago
Which person has more potential energy? Noah who jumped out of the plane at 100 m or Clara at 50 m in the air? Explain.
olga_2 [115]

Answer:

Noah

Step-by-step explanation:

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4 0
3 years ago
The course for a boat race starts at point A and proceeds in the direction of S52'E for 1 hour at 8 knots to point B and then in
KATRIN_1 [288]

Answer:

20.823 nautical miles

S20°E

Step-by-step explanation:

I assume you mean ° (degrees), not ' (minutes).  There are 60 minutes in 1 degree.

S52°E means "south, 52° east", or 52° east of south.

S50°W means "south, 50° west", or 50° west of south.

1 knots = 1 nautical mile / hour, so the boat first travels 8 nautical miles from A to B, then 4.5 nautical miles from B to C, then finally back to A.

If we say A is at the origin, then the coordinates of B are:

(8 sin 52°, -8 cos 52°)

And the coordinates of C are:

(8 sin 52° − 4.5 sin 50°, -8 cos 52° − 4.5 cos 50°)

(2.857, -7.818)

So the distance from A to C is:

x = √(2.857² + (-7.818)²)

x ≈ 8.323

And the total distance of the race is:

d = 8 + 4.5 + 8.323

d = 20.823

The compass bearing from A to C is:

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θ ≈ S20°E

8 0
3 years ago
A bathtub can hold up to 110 gallons of water. The bathtub now contains 78
Irina18 [472]

Answer: (B) 30 gallons.

Step-by-step explanation: Lets subtract 110 - 78 to find the maximum amount of additional water, w that can be added to the tub.

110 - 78 = 32.

round 32 to 30.

So, a reasonable value would be 30 gallons.

7 0
3 years ago
Read 2 more answers
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