Question

A. Justify your answer. *( 9) * 2.78 x 2.78 x (13) * (***(-6.2) X(-0.2873) - 4X XA

Answer 1

In order to find the sign of the product, we need to know that the product of two equal signs will be a positive sign, and two different signs will be a negative sign.

Also, we can consider just the sign of each number in order to find the final sign.

So we have that:

`\begin{gathered} -4\cdot(-(8)/(9))\cdot2.78\cdot(1(1)/(3))\cdot(-(2)/(5))\cdot(-6.2)\cdot(-0.2873)\cdot(3(1)/(11))\cdot A \\ =(_{}-)(_{}-)(_{}+)(_{}+)(_{}-)(_{}-)(_{}-)(_{}+)\cdot A \\ =-A \end{gathered}`

The sign of the product is negative, if A is a positive number, and is positive, if A is a negative number.