When you have 2/5 and 1/2, the common denominator in this case is 5 X 2 = 10.
If you change the two fractions to be represented by the common denominator 10, 2/5=4/10 and 1/2=5/10
You have your answer: 2/5=4/10<5/10=1/2.
If you are more comfortable thinking about slices of pizza,...
The cost(c) to order n frames is c=4n+p; p is 5. What is the cost for 3 picture frames?
Does this make more sense?
To calculate the cost, you follow cost=number of frames * 4 + 5
Light is transverse electromagnetic wave. Transverse means that the oscillation of energy is perpendicular to the direction of light.
Mathematically, there can be unlimited amount of directions in a space that are all perpendicular to a given line. In reality, this is the case...