19. Some drivers try to estimate their annual cost of repairs $c in relation to their average speed of driving s km/h using the equation
c=6s + 50. Draw the graph for 0 <s<160. From the graph find:
a) the estimated repair bill for a man who drives at an average
speed of 65 km/h
b) the average speed at which a motorist drives if his annual
repair bill is $300
c) the annual saving for a man who, on returning from a holiday,
reduces his average speed of driving from 100 km/h to 65 km/h.

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

Evaluate the expression for the given value of the variable. | ? 4 b ? 8 | + ? ? ? 1 ? b 2 ? ? + 2 b 3 -4b-8+-1-b2+2b3 ; b = ? 2 b=-2

3.4a=57.8 what is the the value of a