How many degrees of angle measure are in half of a circle? Exactly how many radians of angle measure are there in one half of a circle?

Lance lived in portugal and brazil for a total of 14 months to learn portuguese. he learned an average of 130 new words per month when he lived in portugal, and an average of 150 new words per month when he lived in brazil. in total he learned 1920 new words. write a system of equations to represent the situation. use x to represent portugal, and y to represent brazil

Let f(x) = 3 − x . find the average rate of change of f(x) from x = a to x = a + h and simplify your answer so that no single factor of h is left in the denominator.

100 points? me its important ‼️‼️‼️‼️‼️‼️‼️‼️‼️‼️‼️