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3 years ago

Subtract 2 16/21 - (-8 5/21). reduce if possible

Mathematics

1 answer:

amid [387]3 years ago

3 0

Answer= 11. Two negatives equals a positive so you add them together.

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Let U={1,2,3,4,5,6,7,8}A={2,3,6}B={2,4,5,7}C={1,7,8}Find the following use the roster method to write method to write the set. E

Ipatiy [6.2K]

A U B = set of all elements that are in both A or B:

A U B = {2, 3, 4, 5, 6, 7}

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1 year ago

Derive the equation of the parabola with a focus at (_5, 5) and a directrix of y = -1.

mars1129 [50]

Answer: Option D is correct.

Step-by-step explanation:

Since we have given that

focus = (-5,5)

and a directrix y= -1

Since, equation of parabola in this case will be

$(x-h)^2=4.a(y-k)$

Now, here

$y=k-a=-1\\\\\text { focus =(h,k+a)}\\\\\text{So,} k+a=5\\\\\text{ by solving these two equation , we get }\\\\a=3\text{ and } k=2$

So equation will be

$(x+5)^2=4\times 3(y-2)\\\\(x+5)^2=12(y-3)\\\\y=\frac{1}{12}(x+5)^2+2$

So, option D is correct .

4 0

3 years ago

Read 2 more answers

How do we graph f(x)=x-7

babymother [125]

The graph of f(x) is a straight line passing through points (0, -7) and (7, 0)

4 0

3 years ago

I need help with this question ASAP

IgorLugansk [536]

Answer:

The answer would be 49 I think hehe

Step-by-step explanation:

7 0

3 years ago

A group of five people are all working on the same mathematics problem. On the night before it is due, they call each other to d

UkoKoshka [18]

Answer:

Minimum number of calls = 10

Step-by-step explanation:

Lets name the five people as A,B,C,D and E.

<u>On the night before ,each person talks to every other person atleast once that means A would talk to B,C,D and E atleast once.</u>

Lets start with A. He would talk to other 4 people which means there would be 4 phone calls made.

Now lets take B. He can talk to A,C,D and E. But A has already talked to C therefore to get minimum number of phone calls , B need not call A again. So he calls only C,D and E.

In case of C using similar logic he need to talk to only D and E.

For D , he talks to E alone.

E does not have to talk to anyone as he has already talked to everyone atleast once.

Total calls = 4 + 3 + 2 + 1

= 10

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3 years ago

Subtract 2 16/21 - (-8 5/21). reduce if possible​

Subtract 2 16/21 - (-8 5/21). reduce if possible