Answer:
Cost of pencil is $0.35 and cost of pen is 0.75
Step-by-step explanation:
The cost of one pencil and one pen is required.
The cost of a pencil is $0.35 and a pen is $0.75.
The number of pens is 12.
The number of pencils is 20.
Let the cost of one pencil be
A pen costs $0.40 dollar more than pen.
So, cost of a pen is
Total cost of all the pens and pencils is $16.
Cost of pencil is $0.35 and cost of pen is 0.75
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Answer: c) About 16% of the variation in value of the car is explained by a linear relationship with the age of the car.
e) The correlation coefficient, r, is 0.397.
Step-by-step explanation:
Given that:
Coefficient of determination (r²) between two variables, age of car (x) and value of car (y) = 0.158
Correlation of determination (r²) of 0.158 = (0.158 × 100% = 15.8% of the variation between the two variables can be explained by the regression line). Hence, about 16% of the variation between age and value of car can be explained by the linear relationship.
Coefficient of correlation (r) = sqrt(r²) = sqrt(0.158) = 0.397
Answer:
4-3=1
8-9=-1
Step-by-step explanation:
I hope this helps