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zheka24 [161]
3 years ago
8

Find a.b. a=[4,1,1/4], b=[6,-3, -8]

Mathematics
1 answer:
Genrish500 [490]3 years ago
3 0

Answer:

a.b =19

Step-by-step explanation:

We are given the following in the question:

a=\langle 4,1,\frac{1}{4} \rangle, b=\langle 6,-3,-8\rangle

We have to find the dot product.

Formula:

a = \langle x_1,x_2,x_3\rangle\\b = \langle y_1.y_2,y_3\rangle\\a.b = x_1y_1 + x_2y_2 + x_3y_3

Putting the corresponding values we get,

a.b = (4.6) + (1.-3) + (\frac{1}{4}.-8)\\= 24-3-2\\=19

a.b =19    

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3 is the answer for it
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4. Two unbiased coins are tossed. Calculate the probability that
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Answer:

Step-by-step explanation:

3 coins make for 8 possible outcomes {HHH,HHT,HTH,THH,HTT,THT,TTH,TTT}

4 Possible outcomes conatin 2 or more heads.

Probability (At least 2 Heads) = Favourable outcomes/Total possible outcomes

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7 0
3 years ago
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TEA [102]

Answer:

x=5, y=2

Step-by-step explanation:

You simply write down what you see:

3x - 4y + 4x - 5y = 17

2x - 3y + 3x - 5y = 9

Then you simplify by grouping the x and the y terms:

7x - 9y = 17

5x - 8y = 9

Now you want to get equal amounts of x or y. Let's go for x. If we multiply the top eq with 5 and the bottom one with -7, we get:

35x - 45y = 85

-35x  + 56y = -63

-------------------------+ now we can add them:

11y = 22 divide by -11

y = 2

So 7x - 18 = 17, x =5

Finally, it makes sense to double check by filling in these answers in the original equations, just to see if no mistakes were made:

3*5 - 4*2 = 7

4*5 - 5*2 = 10

7+10 = 17: ok!

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4 0
3 years ago
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7 0
2 years ago
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asambeis [7]

Answer:

4

Step-by-step explanation:

If two variables are proportional then

y\propto x

y=kx    ...(i)

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The given equation is

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where,

s = number of cups of seltzer.

c = cups of cranberry juice.

On comparing (i) and (ii), we get

Independent variable: x=c

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Constant of proportionality: k=4

Therefore, the constant of proportionality is 4.

8 0
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