Biruk wants to buy a book for $15.25 and a book for $4.85 he wants to pay with one $ 20. bill use estimation to decide if this is reasonable explain to what place value to round for an estimate that is useful in this situation

First, round 15.25 to 15.30. Round 4.85 to 4.90, and then add. You get 21.20. No it is not reasonable and you round to the decimal ones

Period is the time it takes for one “cycle” to complete. in the parent sine function, period is 2*pi since sin(0) = 0, sin(pi/2) = 1, sin(pi) = 0, sin(3pi/2) = -1, and sin(2pi) = 0. at that point, the sequence repeats itself. i’m not sure if your graph is similar to the sine function since you didn’t provide a picture, but you can find the period by looking at a graph.

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