Can someone explain to my why sin(90)=1

On the unit circle: the end of the terminal side of a 90 degree angle is (1,0) where 1 is the value of sin(90°) and 0 is the value of cos(90°)

On the graph of sine: 90° =  radians. if f(x) = sin(x) in radians, f() = 1/2

Barb wants to divide the days in a year by a number.

Step-by-step explanation:

The given expression is  [365 divided by y], where y be any arbitrary number.

The given expression has numerator as 365 and denominator as y which can be any number.

We know that , the number of days in one year = 365

Hence, from the given option the right scenario which could be represented by the algebraic expression is "Barb wants to divide the days in a year by a number.

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