Please help solve these questions

Question 11 (1 point) The cost to fence in a backyard is $1000 for an area less than or equal to 100 m2. An area greater than 100 m costs an additional $7 per square metre. Which is the correct piecewise function that represents the average cost per square metre? O a) 1000 C (a) = , 100 1000+7x , 100 O b) 1000 C(x) = , 100 O c) 1000x C (x) = , 300 Where x represents one week. O d) 500+25x 2 300 Where x represents one week.Question 14 (1 point) The population of wolves in a wildlife reserve can be modelled by the function f (z) = 1000+600x 1040.67 . Where f (@ ) is the population of wolves, and x is the number of years since the population was introduced. In the context of this model, what is the domain of the function? O a) Domain: { a 2 2 0, x E R} O b) Domain: { a|a 0, x E R} O c) Domain: (x x 2 -2 x ER O d) Domain: { ac | x E R}Question 15 (1 point) The concentration, C, of a drug in the blood after t hours is given by C (t) = 5t 2t2 +6 where C is measured in mg/L. In the context of this model, what is the domain of the function? Oa) Domain: {t t 2 0, te R} O b ) Domain: {t t 0, te R} O c) Domain: {t| - 0.7217