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Margarita [4]
3 years ago
5

PLEASE HELP ! 30 POINTS WHOEVER ANSWERS GETS BRAINEST! Evaluate.

Mathematics
1 answer:
Murljashka [212]3 years ago
5 0

Answer:

55075  / 68992

Step-by-step explanation:

:) hope this helps

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A turntable makes 45 revolutions per minute. How many revolutions does it make per second?
Stolb23 [73]

Answer:

45/60=0.75

Step-by-step explanation:

7 0
2 years ago
If for two non-zero vectors a,b : ∣a+b∣=∣a−b∣ then angle between them is:______a. 0b. 45c. 60d. 90
Eddi Din [679]

Answer:

90^\circ

Step-by-step explanation:

Given two non zero vectors, \vec a, \vec b.

Let the angle between the two vectors = \theta

Given that:

|\vec a+\vec b|=|\vec a-\vec b|

Let us have a look at the formula for magnitude of addition of two vectors:

|\vec x+\vec y|=\sqrt{x^2+y^2+2xycos\theta}

Where \theta is the angle between the two vectors.

formula for magnitude of subtraction of two vectors:

|\vec x-\vec y|=\sqrt{x^2+y^2-2xycos\theta}

As per the given condition:

\sqrt{a^2+b^2+2abcos\theta}=\sqrt{a^2+b^2-2abcos\theta}

Squaring both sides:

a^2+b^2+2abcos\theta=a^2+b^2-2abcos\theta\\\Rightarrow 2abcos\theta=-2abcos\theta\\\Rightarrow cos\theta = -cos\theta\\\Rightarrow 2cos\theta = 0\\\Rightarrow cos\theta = 0\\\Rightarrow \theta = 90^\circ

So, the angle between the two vectors is: 90^\circ

7 0
2 years ago
What is the value of the expression of 10?
Shalnov [3]
10 I would say because there are no other numbers
8 0
3 years ago
A map has a scale of 1 cm to 14 km.
Alenkinab [10]

Answer:

Real distance between Manchester and London = 263.2 km

Step-by-step explanation:

Given that:

A map has a scale of 1 cm = 14 km

Ratio = 1 : 14

Distance from Manchester to London = 18.8 cm

Let,

x be the real distance between Manchester and London.

Ratio = 18.8 : x

As the relationship is proportional,

1 : 14 :: 18.8 : x

Product of mean = Product of extreme

14*18.8 = x

x = 263.2 kilometers

Hence,

Real distance between Manchester and London = 263.2 km

6 0
2 years ago
What is the graph of the function f(x)=x2+ 2x+ 3?
8090 [49]

Answer:


Step-by-step explanation:

The best way to do this is to let a graphing program do it. You could do it from a chart, but a graphing program can be useful for that as well. We'll make up a mini chart here

x        method                        y

-3      (-3)^2 + 2(-3) + 3 =       6

-2      (-2)^2 + 2(-2) + 3 =       3

-1       (-1)^2 + 2(-1)  + 3 =        2

0                                            3

1        (1)^2 + 2(1) + 3              6

2        (2^2) + 2(2) + 3           11

3        (3)^2  +2(3) + 3            18  

See the graph below.    

You can pick it out from the graphs you were given.                

8 0
3 years ago
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