Find the sum and choose the correct answer.
2 answers:
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Answer:
The number of Diplo pops D = 18
The number of sneakers S = 12
Step-by-step expla nation:
Given:
Cost of one Diplo pops = $.50
Cost of one sneakers = $.60
Total number of candies purchased = 30 pieces
cost of the number of candies purchased = $16.80
To Find:
Number of each type of candies = ?
Solution:
Let
The number of Diplo pops be D
The number of sneakers be S
Total number of candies = 30
S+D = 30
S= 30 - D--------------------------------------(1)
and cost of 30 candies is $16.80
S(0.50) + D(0.60) = 16.80----------------(2)
Substituting (1) in (2)
(30 - D)(0.50) + D(0.60) = 16.80
15 - 0.50D +0.60D = 16.80
15 + 0.10D = 16.80
0.10D = 16.80 - 15
0.10D = 1.80
D =
D = 18
So the number of Diplo pops = 18
Number of sneakers S= 30 - 18 = 12
The option fourth "There is a strong negative relationship between x and y" is correct.
<h3>What is correlation?</h3>It is defined as the relation between two variables which is a quantitative type and gives an idea about the direction of these two variables.
The options are:
- There is no relationship between x and y.
- There is a weak negative relationship between x and y.
- There is a strong positive relationship between x and y.
- There is a strong negative relationship between x and y.
We have data:
x 7 8 9 10 11 12 13
y 13 10 7 6 5 3 0
The value of correlation r = -0.9847
As we know the value of r between -1 to +1
If r = 1 (perfect and positive correlation)
if r = -1 (perfect and negative correlation)
We have r = -0.9847
The value is near to -1 which means there is a strong negative relationship between x and y.
Thus, the option fourth "There is a strong negative relationship between x and y" is correct.
Learn more about the correlation here:
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