15. three semicircles of radius 1 are constructed on diameter ab of a semicircle of radius 2. the centers of the small semicircles divide ab into four line segments of equal length. what is the area of the region that lies inside the large semicircle but outside the small semicircles?

This is for my 8th grade science class, i really don’t understand. can someone me? , lol.

9.98 kg of r-134a at 300 kpa fills a rigid container whose volume is 14 l. determine the temperature and total enthalpy in the container. the container is now heated until the pressure is 600 kpa. determine the temperature and total enthalpy when the heating is completed. use data from the steam tables.

An object with initial temperature 130 ∘ f is submerged in large tank of water whose temperature is 50 ∘ f . find a formula for f ( t ) , the temperature of the object after t minutes, if the cooling constant is k = − 0.2 . remember newton's law of cooling (the rate of change of temperature with respect to time is equal to k times the difference between the temperature of the object and the surrounding temperature) ! : )