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CaHeK987 [17]
3 years ago
12

Express 81 as the sum of first nine consecutive odd numbers

Mathematics
1 answer:
matrenka [14]3 years ago
3 0

Answer:

see explanation

Step-by-step explanation:

The sum of the first 9 consecutive odd numbers is

1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 = 81

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Somebody please help me with this question!​
marta [7]

Answers:

P(A) = 7/12

P(B) = 1/2

=====================================================

Explanation:

To see how I calculated P(A), check out this link to this very similar question

brainly.com/question/27669586

--------------------

Now to calculate P(B)

If a number is divisible by 2, then the number is a multiple of 2.

In other words, the number is even.

Counting through the values in the table, you should find that there are 18 sums that are even (2, 4, 6, 8, 10 and 12). Refer to the dice chart below.

Here's a further breakdown

  • 1 copy of "2"
  • 3 copies of "4"
  • 5 copies of "6"
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Side note: We have nice symmetry going on.

There are 1+3+5+5+3+1 = 18 values total that are even numbers. The other half are odd numbers of course.

P(B) = 18/36 = (1*18)/(2*18) = 1/2

3 0
2 years ago
An iphone costs $1000 and is on sale for 20% off
vfiekz [6]

Answer:

200

Step-by-step explanation:

20 X 1000= 20000 divided by 100

6 0
3 years ago
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What is the equivalent radical expression for the exponential expression<br> below?<br> 181/2
Snowcat [4.5K]

Answer: Use this rule to change the term to a radical:

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We can simplify this expression, if necessary, by using this rule for radicals:

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There is a positive correlation between the number of times the Striped Ground Cricket chirps per second and the temperature in
Svetllana [295]
I think the answer is 85 im not sure
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allochka39001 [22]

Answer:

Cities A and C should be in Group 2

Step-by-step explanation:

Cities:

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