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3 years ago

Roster method of A = {x | x is an odd number and 20 < x < 30}

1 answer:

3 0

A "roster" here is essentially a version of the set with all of elements listed out. Here, those elements are all of the odd numbers between 20 and 30, so our list would be

{21, 23, 25, 27, 29}

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What is 70 percent of 20?

RideAnS [48]

Answer:

Step-by-step explanation:

All you need to do is turn 70% into a decimal which is .70

Then multiply .70 and 20

.70*20

which gives you 14

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3 years ago

Read 2 more answers

What is the digit in the ten billions place in this number 30,242,386,651

Minchanka [31]

It’s 1 that’s in the ten billions

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3 years ago

This year jake is 47 in tall. This is 4 more than he was last year. Write and solve an equation to find out how tall jake was la

Solnce55 [7]

Answer:

x + 4 = 47

x = 43

Step-by-step explanation:

i minus 4 from 47 to get x by its self and x = 43 do he was 43 inches last year

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3 years ago

Find the cotangent of angle B. 1. 12/5 2. 12/13 3. 13/12 4. 5/12

labwork [276]

Cot = Cos/Sin

Cos = 12/13
Sin = 5/13

Therefore, 12/3 divided by 5/13 equals 12/5

Answer is 1.

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3 years ago

Read 2 more answers

An unprepared student makes random guesses for the ten true-false questions on a quiz. Find the probability that there is at le

hoa [83]

Answer:

0.999

Step-by-step explanation:

At least 1 correct means, 1 correct, 2 correct, 3 correct ... until 10 correct. That would be a long process to calculate.

Instead we use the complement rule to calculate.

$P(x\geq1)=1-P(x$

So we need to find P(x<1). So this is getting 0 answers correct, or 10 incorrect.

In true false question, probablity of correct is 1/2 and incorrect is 1/2, hence,

Probability of 10 incorrect is (1/2)^10

Thus,

$P(x\geq1)=1-(\frac{1}{2})^{10}=0.999$

So the answer is 0.999 (rounded to nearest thousandth)

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3 years ago