A contractor and a gravel truck driver arranged to meet at a sandpit 9 km away. In travelling to the oit, the gravel truck's average speed was 25 km/h slower than that of the contractor's car. The gravel truck took 4 minutes longer than the car to reach the gravel sandpit, as modelled by the equation 9/x-25 - 9/x = 4/60 to the nearest km/h , what is the average speed of the car

Acable company wants to provide cell phone service for residents on an island. the function for the cost of laying the cable from the island to the mainland is c(x)= 6.500 square root x2+4, where x represents the length of the cable in feet. what are the domain and range of the function? a) domain: all real numbers range: all real numbers greater than or equal to 17,000 b) domain: all real numbers greater than or equal to 0 range: all real numbers greater than or equal to 17,000 c) domain: all real numbers greater than or equal to 0 range: all real numbers greater than or equal to 13,000 d) domain: all real numbers greater than or equal to 13,000 range: all real numbers greater than or equal to 0

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

Atriangle with all sides of equal length is a/an triangle. a. right b. scalene c. equilateral d. isosceles