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3 years ago

86,921 in expanded form

Mathematics

2 answers:

Rudik [331]3 years ago

3 0

86921 = 80000 + 6000 + 900 +20 +1

Irina18 [472]3 years ago

3 0

Eight thousand nine hundred twenty-one

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Which expression represents rational numbers? Select all that apply

Masja [62]

Answer:

A, B, C and F

Step-by-step explanation:

We have according to the options:

A. $\sqrt{100} \times \sqrt{100}=10\times 10=20$

B. $13.5+\sqrt{81} =13.5+9=22.5$

C. $\sqrt{9}+\sqrt{729}=3+27=30$

D. $\sqrt{64}+\sqrt{353}=8+\sqrt{353}$ , which is not rational.

E. $\frac{1}{3}+\sqrt{216}=0.3+6\sqrt{6}$ , which is not rational.

F. $\frac{3}{5}+2.5=0.6+2.5=3.1$

Hence, the expressions representing rational numbers are A, B, C and F.

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4 years ago

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im totally confused by this question

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3 years ago

CAN YOU GUYS PLS HELP WHAT GOES IN EACH BOX ITS OVERDUE :( IM ABT TO FAIL WILL GIVE BRAINLIEST

mario62 [17]

Answer:

18 days.

Step-by-step explanation:

Takes 6 days to eat 1 apple so multiply 6 by three to get your answer.

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4 years ago

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What is the surface area of a die in which each edge has a length of 15 millimeters? (Hint: On a cube, the length, width, and he

oee [108]

In order to find the surface area of a cube, you need to find the area of one of the sides.

15*15 = 225

this would then be multiplied by 6 to account for all of the sides of the cube.

225*6 = 1350 millimeters ^2

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3 years ago

If 90 percent of automobiles in Orange County have both headlights working, what is the probability that in a sample of eight au

Marta_Voda [28]

Answer:

$P(X \geq 7) = P(X=7) +P(X=8)$

And we can find the individual probabilities using the probability mass function

$P(X=7)=(8C7)(0.9)^7 (1-0.9)^{8-7}=0.3826$

$P(X=8)=(8C8)(0.9)^8 (1-0.9)^{8-8}=0.4305$

And replacing we got:

$P(X \geq 7) = P(X=7) +P(X=8)=0.3826 +0.4305=0.8131$

Step-by-step explanation:

Previous concepts

The binomial distribution is a "DISCRETE probability distribution that summarizes the probability that a value will take one of two independent values under a given set of parameters. The assumptions for the binomial distribution are that there is only one outcome for each trial, each trial has the same probability of success, and each trial is mutually exclusive, or independent of each other".

Solution to the problem

Let X the random variable of interest "number of automobiles with both headligths working", on this case we now that:

$X \sim Binom(n=8, p=0.9)$