Which best describes the strength of a model with an r-value of 0.29? a weak positive correlation a strong positive correlation a weak negative correlation a strong negative correlation

So the closer the correlation is to 1/-1, the stronger the correlation is. Since 0.29 is closer to zero than 1, it is a weaker correlation. And since its positive, its a positive correlation.
In short, 0.29 is a weak positive correlation.