Mike saw 4 times and many birds as gigi. mike saw 28 birds. which equation can be used to find how many birds gigi saw? a. 4x28=n b. 28-4=n c. 4+28=n d. 28+4=n

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Short A. 4 x 28 = n

Why?

You can use context clues. So, Gigi saw n birds, Mike saw 4 times as many birds as Gigi. Times is often referred to as multiplication. What is the only equation that shows times, or multiplication? That'd be A. 4 x 28 = n

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Consider for a moment building a tree with all possible choices. The first row would contain 8 books (each possible choice for the first book). Then, the second row would contain 7 books for each book in the first row (the choices possible for the second book). Otherwise, it would be 8*7. Following this principal, we continue to multiply down to 1. 8*7*6*5*4*3*2*1. This is also known as 8!, a factorial.
Finally, 8! = 40,320