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3 years ago

What number should be added to the expression x^2 + 4x to change it into a perfect square trinomial?

2 answers:

8 0

X^2 + 4x
the number to be added is found by dividing the constant of x by 2
and squared the number
so # to be added = ( 4/2)² = 4
the perfect square trinomial is
x² + 4x + 4 = (x + 2 )² which is a perfect square trinomial
I hope this help you

tiny-mole [99]3 years ago

3 0

He number that must be added is four because (x+2)^2=x^2+4x+4

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The probability that a single radar set will detect an enemy plane is 0.9. if we have five radar sets, what is the probability t

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The probability that a single radar set will detect an enemy plane is 0.9. if we have five radar sets, what is the probability that exactly four sets will detect the plane?

Solution: The given random experiment follows binomial distribution with $p=0.9,n=5$

Let x be the number of radar sets that will detect the plane.

We have to find $P(x=4)$

$P(x=4)=\binom{5}{4}0.9^{4}(1-0.9)^{5-4}$

$=5\times 0.6561 \times 0.1$

$=0.3281$

Therefore, the probability that exactly four sets will detect the plane is 0.3281

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3 years ago

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Answer:

Step-by-step explanation:

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3 years ago

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We have been given that red, green, and white jellybeans are combined in a ratio of 5:4:3 respectively. We are asked to find out the ratio of green jelly beans to the total number of jelly beans.

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Now we can find out out our desirable ratio by substituting our finding in the ratio.

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