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How many zeros does the function f(x)=4x3-x2+1 have

Plz ( true - false) all triangles have interior angles whose measure sum to 90.

The average daily maximum temperature for laura’s hometown can be modeled by the function f(x)=4.5sin(πx/6)+11.8 , where f(x) is the temperature in °c and x is the month. x = 0 corresponds to january.what is the average daily maximum temperature in may? round to the nearest tenth of a degree if needed.use 3.14 for π .