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Follow these steps: 1) Use the original price given, multiplying it by [(100-first discount percentage) over 100] This is done to get the discounted price when the discount is applied once. 2) Us...

First look at the volume of a cone, V = (piRH)/3. It is clear the volume of our conical frustum will be that of a large cone minus that of a smaller one on top. Also note that the smaller cone wi...

Whenever we have two equations with two unknowns (x and y) to solve simultaneously, we can try to substitute one equation into the other. If we were to multiply every term in equation 1 by 1.5, then we wo...

Working on the left hand side of the expression, we have to distribute the 7 taking into consideration the negative sign. So, 7 multiplied by 3y= 21y and 7X-5= -35. Simplifying the right hand side,being c...

The importan thing to remember is that each part of both of the brackets must be multiplied by each part of the other bracket (the word 'expand' meaning multiply when the brackets are next to one another)...