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Cloud [144]
3 years ago
13

30 girls and boys have planned for a picnic. There is a ratio of 3 girls to 7 boys. How many boys are there?

Mathematics
2 answers:
nirvana33 [79]3 years ago
3 0
Should be 21 boys because 7+7+7 equal 21 and 3+3+3 equal 9 which equals 30
Radda [10]3 years ago
3 0
I got 21. For every 3 there was 7, so put down 3, add 7 and do such untiollyour total value is 30.
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The manager of a grocery store wants to determine the average amount of money spent at his store as it compares to the average d
Nezavi [6.7K]

Answer:

The average spent at his store is of $37.60.

The average spent at his competitor's store is of $48.53.

Step-by-step explanation:

Average of a data set:

The mean of a data set is the sum of all values divided by the number of values.

His store:

15 orders.

Prices of: 41, 38, 19, 30, 21, 53, 34, 34, 37, 29, 50, 43, 57, 28, 50

The average is:

M = \frac{41 + 38 + 19 + 30 + 21 + 53 + 34 + 34 + 37 + 29 + 50 + 43 + 57 + 28 + 50}{15} = 37.6

The average spent at his store is of $37.60.

Store of the competitor:

15 orders

Prices of: 86, 15, 75, 40, 51, 60, 27, 45, 112, 7, 65, 31, 18, 27, 69

The average is:

M = \frac{86 + 15 + 75 + 40 + 51 + 60 + 27 + 45 + 112 + 7 + 65 + 31 + 18 + 27 + 69}{15} = 48.53

The average spent at his competitor's store is of $48.53.

8 0
3 years ago
Perform the indicated operation.
ivann1987 [24]

Answer:

27+4x

Step-by-step explanation:

First bracket :9×2-4×2+2x+3=18-8+2x+3,second bracket :answer =-1-6x+5 combine both and get :27+4x

4 0
3 years ago
Determine whether 81 − 49n4 is a difference of two squares. If so, factor it. If not, explain why.
Mumz [18]

We have

81-49n^4=9^2-(7n^2)^2

so this is indeed a difference of squares. Factorizing would give

81-49n^4=(9-7n^2)(9+7n^2)

making the answer D.

We can further factor the first term here and write

9-7n^2=3^2-(\sqrt 7\,n)^2=(3-\sqrt7\,n)(3+\sqrt7\,n)

but that's clearly out of the scope of this question.

7 0
3 years ago
Heyy! please help posted picture of question
Bond [772]
A and D are true



good luck
4 0
3 years ago
Read 2 more answers
If there are 7,674,000,000 people in the world and 80,000 of them have a Reh, what is the probability at least one person has a
9966 [12]

Answer:

its not 80k/3000 someone answer

Step-by-step explanation:

3 0
3 years ago
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