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Agata [3.3K]
3 years ago
11

12- pls help!!!! math - —

Mathematics
1 answer:
bija089 [108]3 years ago
8 0

Answer:

c

Step-by-step explanation:

Easiest way is drawing the vectors.

If you need a better reason you can get it through dot product.

Let X be the angle needed.

Dot product of two vectors is defined as

A •B = |A||B|cosX

where X is the angle between A and B

cosX=A•B/ |A||B|

=(-1×-9+1×0) / (√(-1^2+1^2)×√(-9^2))

=1/√2

So the answer is X=45°

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Answer:

19

Step-by-step explanation:

9+10=19

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How do you find the area of this
devlian [24]

Answer:

156 cm^2

Step-by-step explanation:

area of a paralelogram is Base times hieght

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John has to build a box for his scouting project with a volume of 36 cubic centimeters.
prohojiy [21]

Answer:

John should build the box 3 cm high.

Step-by-step explanation:

John should build the box 3 cm high because to find the volume you must do length x width x height. To find this you have to multiply the length x width. In this problem 6 would be the length and 2 would be the width. After multiplying those you get 12. You then have to find what number multiplies with 12 to get 36, which is 3. Hope this helped!

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Answer:

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3 years ago
find three consecutive odd integers such that the sum of the smallest number and middle number is 27 less than 3 times the large
katrin2010 [14]

A generic odd number can be written as

2k+1,\quad k \in \mathbb{Z}

Since there is an odd number every two numbers, three consecutive odd numbers will be

2k+1,\quad 2k+3,\quad 2k+5

Now let's make up the equations: the sum of the first two is

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And 27 less than 3 times the largest is

3(2k+5)-27

These two must be the same, so we have

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Subtracting 4k and 3 from both sides gives

1=2k \iff k=\dfrac{1}{2}

Which means that the problem has no solution.

To confirm this hypothesis, we can observe that, on the left hand side, we have the sum of two odd numbers, which is even

On the right hand side, we have an odd number, multiplied by 3 (still odd), take away 27 (still odd).

So, the left hand side is even, and the right hand side is odd. They can't be the same number.

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