4 years ago

How do i find 20×50 using mental math

2 answers:

8 0

What you can do is see it like this 20x50 or take 5x2 which is 10 and then count how many zeroz there are in the original equation and add them. Since there are 2 zeros you add them to the 10, so the answer will be 1000.

svetlana [45]4 years ago

4 0

2 times 5 = 10 then u add the two 0s back to get 1,000

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vredina [299]

Answer: c) About 16% of the variation in value of the car is explained by a linear relationship with the age of the car.

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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

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4 years ago

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