For the following questions answer them individually
If the two lines of regression are perpendicular to each other then the value of coefficient of correlation is -
If the international terms of trade settle at a level that is between each country's opportunity cost, then
An exchange rate which also takes into account the relative prices of products in the countries being compared is known as -
Find the mi.nor of element 8 in the determinant $$\triangle = \begin{bmatrix}1 & 4 & 6 \\2 & 5 & 9\\8 & 7 & 12 \end{bmatrix}$$
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