- a) You are provided with a metre rule, distant object, concave mirror and a white screen. Briefly describe how you can estimate the focal length of the concave mirror.
(3 marks)​

Let f(x) = x4- 8x2 . find the relativeextrema of this function using the second derivative test.

How many neutrons does element x have if it’s stormy umber is 33 and it’s mass number is 95?

Assume that a person skiing high in the mountains at an altitude of h = 15100 ft takes in the same volume of air with each breath as she does while walking at sea level. determine the ratio of the mass of oxygen inhaled for each breath at this high altitude compared to that at sea level. assume that the air composition (i. e. % of air that is oxygen) is the same at sea level as it is at 15100 ft.