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2 years ago

One less than twice a number x is more than 5.

Mathematics

2 answers:

Setler [38]2 years ago

8 0

Answer:

1- (2x + 5)

Step-by-step explanation: I"m srry if this isn't right, I am not very good at math.

Tasya [4]2 years ago

5 0

Answer:

x > 3

Step-by-step explanation:

You want an inequality

2x-1 >5

2x>6 divide by 2

x>3

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2 years ago

Read 2 more answers

A fair coin is flipped twelve times. What is the probability of the coin landing tails up exactly nine times?

seraphim [82]

Answer:

$P\left(E\right)=\frac{55}{1024}$

Step-by-step explanation:

Given that a fair coin is flipped twelve times.

It means the number of possible sequences of heads and tails would be:

2¹² = 4096

We can determine the number of ways that such a sequence could contain exactly 9 tails is the number of ways of choosing 9 out of 12, using the formula

$nCr=\frac{n!}{r!\left(n-r\right)!}$

Plug in n = 12 and r = 9

$=\frac{12!}{9!\left(12-9\right)!}$

$=\frac{12!}{9!\cdot \:3!}$

$=\frac{12\cdot \:11\cdot \:10}{3!}$ ∵ $\frac{12!}{9!}=12\cdot \:11\cdot \:10$

$=\frac{1320}{6}$ ∵ $3!\:=\:3\times 2\times 1=6$

$=220$

Thus, the probability will be:

$P\left(E\right)=\frac{n\left(E\right)}{n\left(S\right)}$

$=\frac{220}{4096}$

$=\frac{55}{1024}$

Thus, the probability of the coin landing tails up exactly nine times will be:

$P\left(E\right)=\frac{55}{1024}$

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2 years ago

Can someone help me

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3 years ago

The king comes from a family of 2 children. what is the probability that the other child is his sister?

stira [4]

The chance is 50% because if there are 2 children the probability would be 1/2 or 50%.

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3 years ago