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2 years ago

64x + 16 what does the x stand for

2 answers:

7 0

The algebraic expression consists of:
64 as the coefficient of x
x as a variable
16 as a constant

Therefore, the x stands for variable

Nadya [2.5K]2 years ago

3 0

It could stand for anything I think bro. not to sure but I think so

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If a fair coin is tossed 4 times, there are 16 possible sequences of heads (H) and tails (T). Supposethe random variable X repre

postnew [5]

Answer:

The probability distribution of X is:

$P(x=0)=0.0625\\\\P(x=1)=0.25\\\\P(x=2)=0.375\\\\P(x=3)=0.25\\\\P(x=4)=0.0625\\\\$

Step-by-step explanation:

"Tossing a coin and getting H" can be modelled as a Bernoulli random variable. The variable X is a sum of 4 of this Bernoulli variables, we can model X as a binomial random variable, with p=0.5 and n=4.

The values X can take are: 0, 1, 2, 3 and 4.

The values of this probability are calculated as:

$P(x=0) = \binom{4}{0} p^{0}q^{4}=1*1*0.0625=0.0625\\\\P(x=1) = \binom{4}{1} p^{1}q^{3}=4*0.5*0.125=0.25\\\\P(x=2) = \binom{4}{2} p^{2}q^{2}=6*0.25*0.25=0.375\\\\P(x=3) = \binom{4}{3} p^{3}q^{1}=4*0.125*0.5=0.25\\\\P(x=4) = \binom{4}{4} p^{4}q^{0}=1*0.0625*1=0.0625\\\\$

Where

p: is the probability of tossing a coin and getting a Heads

q: is the probability of tossing a coin and not getting a Heads.

The binomial number is a way to calculate the possible combinations of getting a certain amount of heads.

For example, in 4 tosses, there are 6 ways or combinations of getting 2 heads and 2 tails:

$\binom{4}{2}=\frac{4!}{2!(4-2)!}=\frac{24}{2*2}=6$

8 0

3 years ago

Solve for x. x2 + 4x - 21 = 0 A. -3, -7 B. -3, 7 C. 3, -7 D. 3, 7

julia-pushkina [17]

Please, use " ^ " to denote exponentiation: x^2 + 4x - 21 = 0

Factor: (x+7)(x-3)=0

Solve for the 2 roots: x= -7 and x= 3: {3, -7} Note how this is in set notation.

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2 years ago

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Which of the following objects is best described by the term line segment?

Ne4ueva [31]

A line segment is a part of a line that is bounded by two distinct end points, and contains every point on the line between its endpoints. ... When the end points both lie on a curve such as a circle.

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2 years ago

An emergency room (ER) nurse noticed that there are an unusually high number of motor-vehicle accident injuries in the month of

Dmitrij [34]

4800 patients

Step-by-step explanation:

120 of 1000 means 12%

12% of 40000 is 4800

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2 years ago

On average a fifth grader blinks 15 times per minute. About how many times will a fifth grader blink in a day?

Juli2301 [7.4K]

Answer:

i think its either 5 or 3.

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2 years ago

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