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3 years ago

Simplify 3a+8+a-9-2a

Mathematics

2 answers:

yarga [219]3 years ago

5 0

3a+8+a-9-2a
4a+8-9-2a
2a+8-9
2a-1
hope this helps :)

Andrej [43]3 years ago

4 0

1a+-1+a I believe that would be the answer

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If you flip a fair coin 4 times, what is the probability that you will get exactly 2 tails

Ilia_Sergeevich [38]

Answer:

<h3>The answer is 3/8 NOT 50%</h3>

Step-by-step explanation:

One way to solve this problem is to figure out how many ways you can get exactly 222 tails, then divide this by the total number of outcomes you could have gotten. Since every outcome has equal probability, this will be the probability that you will get exactly 2 tails.

How many outcomes are there where you get exactly 2 tails? Try thinking of each outcome as a 4-letter word, where the first letter is "H" if the first coin toss was heads and "T" if it was tails, and so on.

So, the number of outcomes with exactly 2 tails is the same as the number of these words which have 2 T's and 2 H's.

How many of these are there? If we treat all the letters as unique, we'll find that there are 4! different arrangements, overcounting 2! times for every time we only switch the T's around, and 2! times for every time we only switch the H's around.

So, there are 4!/2!2! = 6

4!/2!2!= 6 different outcomes where you get exactly 2 tails.

Altogether, there are 2^4 = 16 total possible outcomes.

So, the probability that you will get exactly 2 tails is 6/16 = 3/8

4 0

3 years ago

37 points Which expressions are equivalent to 6a(5+d) ?

uysha [10]

Answer:

B AND C

Step-by-step explanation:

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3 years ago

Two motorcyclist A and B, started simultaneously moving towards each other. From the graph given below, find the distance each o

harina [27]

Answer:

Distance covered by motorcyclist A = 700 - 300 = 400 km

Distance covered by motorcyclist B = 300 - 0 = 300 km

The time before they met went for 5 hours

Average speed of motorcyclist A would be: 400/5 = 80 km/hour

Average speed of motorcyclist B would be : 300/5 = 60 km/hour

Step-by-step explanation:

In the given question first we have to find the distance covered by each of them.

Look at the graph. Motorcyclist A started from 700 km and met at 300 km with motorcyclist B

Thus the distance covered by motorcyclist A = 700 - 300 = 400 km

Motorcyclist B started from 0 km and met with A at point 300 km.

Thus the distance covered by motorcyclist B = 300 - 0 = 300 km

Now we have to find the time before they meet.

Look at the graph. Both motorcyclists met at point t=5

Thus the time before they met went for 5 hours

Now find out the average speed of motorcyclists

To find the average speed we require total distance and time.

Motorcyclist A covered 400 km within 5 hours

Average speed of motorcyclist A would be: 400/5 = 80 km/hour

Average speed of motorcyclist B would be : 300/5 = 60 km/hour

8 0

3 years ago

I need help finding this answer please

Maslowich

To solve this you need to use the formula for Chord-Chord length. You need to know it, it is ab=cd. with this, we can plug numbers in.
a=30
b=x+1
c=2x-6
d=21
So our new equation is:
30(x+1)=21(2x-6)
30x+30=42x-126
156=12x
x=13
This isn't what the question is askign for though, it wants YZ
Which is A+B or 30+x+1 or 21+13=34.
YZ=34

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2 years ago

Which graph represents the function f(x)=2x/x^2-1

velikii [3]

See attachment for your answer:

4 0

3 years ago

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