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First off, we better convert the 30mm into m. Now, we know that in 1cm there are 10mm. So in 2cm, there are going to 20mm and in 3cm there are going to be 30mm. So each textbook is really 3cm thick. Now, ...

This is a multiplication question. Say there were 2 CDs in a box and a shop ordered 10 boxes. How many CDs did the shop order? 20. In the same way this question can be approached. 25x14.

First, combine all the like terms. The terms we have are 2x and 4x. Are they similar? Do they have the same letter? Yes, so they can be combined as stated in the question. It tells us we have to add so we...

Two lines are perpendicular if the product of their slopes is equal to -1. m1 x m2 = -1

The slope of the given line is equal to 1 / 5. If m is the slope of the line perpendicular to the given line,...