# Can anyone help me with an Algebra 1 question?

All of these questions come down to the same thing. When you have an equality relationship like A = B then you can divide both sides of the relationship by some number or variable without problem, IF you can satisfy one requirement. The number or variable that you divide by must never be zero. Let me look at the third problem first. If you know the total length of a movie in seconds, projected at 24 frames per second, and you know that L = 24f then if you solve for f, this tells you the total number of frames. You can solve for f by dividing both sides of this equality relationship by 24. Does this operation satisfy the requirement I mentioned above? 24 is not zero, so there is no problem. L/24 = 24*f/24 But, we know that 24*f/24 can be simplified to just f. The 24 in both the numerator and the denominator will “cancel” each other out, since 24/24 = 1. And when you multiply any number or value by 1, you get the number you started with. So the total number of frames in the movie, f, is

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