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2 years ago

15

Two students from a group of eight boys and 12 girls are sent to represent the school in a parade.

2 answers:

Rama09 [41]2 years ago

6 0

The correct answer is:

C. $\frac{62}{95}$

If the students are chosen at random the probability that the students chosen are not both girls is $\frac{62}{95}$ .

$|Huntrw6|$

harkovskaia [24]2 years ago

4 0

The answer is 62/95. You determine this by calculating the probability of both students being girls.

Probability first student is girl: 12/20
Probability second student is girl: 11/19
Multiply 12/20 * 11/19 = 132/380 or 0.347
Probability of both students not being girls: 1 - 0.347 = 0.653 or 62/95

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The total number of fungal spores can be found using an infinite geometric series where a1 = 8 and the common ratio is 4. Find t

GalinKa [24]

Answer:

$S_{n} = \frac{2(4^{n}-1) }3} if r>1$

Step-by-step explanation:

Explanation:-

<u>Geometric sequence</u>:-

The geometric sequence is of the form

$a,ar,ar^{2},ar^{3}$ ……… be an infinite sequence

here first term is 'a' and ratio is 'r '

In this geometric sequence 'n' t h term is $t_{n} = a r^{n-1}$ ....(1)

Given data a1 term is '8 ' and ratio is '4'

substitute n=1 in equation(1)

$t_{1} = a r^{1-1}$ = 8

$ar=8$ ...........(2)

substitute r= 4 in equation(2)

now we get a(4)=8

dividing "4" on both sides , we get a = 2

<u>Geometric series</u>:-

$a+ar+ar^{2}+ar^{3}+$ .....is an infinite geometric series.

sum of this infinite series will be the upper limit of the fungal spores

that is we have to find sum of infinite series

$S_{n} = \frac{a(r^{n}-1) }{r-1} if r>1$

$S_{n} = \frac{2(4^{n}-1) }{4-1} if r>1$

$S_{n} = \frac{2(4^{n}-1) }3} if r>1$

<u>Final answer:</u>-

sum of this infinite series will be the upper limit of the fungal spores

$S_{n} = \frac{2(4^{n}-1) }3} if r>1$

5 0

2 years ago

Explain how the models in questions in 1 and 2 are the same

motikmotik

When dividing with fractions, you "keep, change, and flip" the problem.

This means that the 4 becomes 1/4, so they are equal to each other.

What it looks like:

$\frac{1}{2}$ ÷ 4 -> $\frac{1}{2}$ x $\frac{1}{4}$

$\frac{1}{2}$ = keep

÷ = change to x

4 = flip to $\frac{1}{4}$

6 0

1 year ago

Read 2 more answers

I need major help!!!!

Mama L [17]

1) Area of a circle = πr^2
Radius = 13.2 ÷ 2
= 6.6
Area = (3.14)(6.6)^2
= 136.78cm^2

I hope this helps!

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2 years ago

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kupik [55]

Answer:

C

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3 years ago

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