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aalyn [17]
3 years ago
15

Simplify. -5x^4(-3x^2+4x-2)

Mathematics
1 answer:
dybincka [34]3 years ago
7 0
Simplification/ 15x^6-20x^5+10x^4

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hi can someone please help me I think the answer is b, but I think I am wrong. will give brainliest ​
Leviafan [203]

Answer:

b

Step-by-step explanation:

7 0
3 years ago
there are n counters in a bag. 4 of the counters are red and the rest are blue. Ross takes a counter from the bag at random and
Ainat [17]

Answer: n = 10.

Step-by-step explanation:

In the bag, we have n counters.

4 of the counters are red.

the rest are blue, then we have:

(n - 4) blue counters.

Now, the probability that Ross takes a blue counter from the bag is equal to the quotient between the number of blue counters (n - 4) and the total number of counters, n

Then the probability is:

p1 = (n - 4)/n

Now he draws another, and it must be blue again, then we can calculate the probability in the same way as above, but he already take a blue counter, so the number of blue counters is (n - 5) and the total number of counters is (n - 1)

The probability of this event is:

p2 = (n - 5)/(n - 1)

The joint probability (the probability that Ross takes two blue counters) is equal to the product of the individual probabilities, and we know that this is equal to 1/3, then we have the equation:

1/3 = ( (n - 4)/n)*((n - 5)/(n - 1))

Now let's solve this for n.

n*(n - 1)/3 = (n - 4)*(n - 5)

(n^2 - n)/3 = n^2 - 4*n - 5*n + 20

n^2 - n = 3*(n^2 - 9*n + 20)

n^2 - n = 3*n^2 - 27*n + 60

0 = (3*n^2 - n^2) - 27*n + n + 60

0 = 2*n^2 - 26*n + 60

The two solutions of this equation can be found with Bhaskara's equation:

n = \frac{-(-26) +- \sqrt{(-26)^2 - 4*2*60} }{2*2} = \frac{26+- 14}{4}

Then the two solutions are:

n = (26 - 14)/4 = 3

This is not an option, because we know for sure that we have 4 red counters, then this option can be discarded.

The other solution is:

n = (26 + 14)/4 = 40/4 = 10

Then we have n = 10, 10 counters in total.

4 0
3 years ago
X+2y-z = 9<br> -2x+y+z= 1<br> 2x-y+2z= -5
hodyreva [135]

Answer:

I don't understand the first one

7 0
3 years ago
Bro its everything but A is the only wrong answer
astraxan [27]
....I am not sure if this is an answerable question XD
5 0
3 years ago
Read 2 more answers
Solve and write the resulting inequality in words: x + 2 &lt; 3
solmaris [256]
I think you did the question wrong

4 0
2 years ago
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