John Is 3 Times as Old as Martha

question 191

Essay

John is 3 times as old as Martha. Seven years ago the sum of their ages was fifty-four. How old are they now? John is __________. Martha is __________.

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Definitions:

Positive Correlation

A relationship between two variables where an increase in one variable is associated with an increase in the other.

Negative Correlation

A connection in which two variables move inversely, with one ascending as the other descends.

Correlation Matrix

A table showing the correlation coefficients between variables. Each cell in the table shows the correlation between two variables.

Diagonal Row

A series of elements positioned diagonally in a matrix or table, connecting one corner with the opposite corner.