Describe the key features of the graph of f(x)=18-3x-x^2/x^2-9? check all that apply
options:
•The graph has a y-intercept at -2
•The graph has an X intercept at -6
•The graph has a vertical asymptote at X=3
•The graph has a vertical asymptote at X= -3
•The graph has a horizontal asymptote at Y=1

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

Anyone know? will mark brainliest if you're correct!

Which of the following expressions is equal to 2x^2+8