Can someone me with this? plz.

solve the quadratic equation 2x^2-4x-1=0

Given a(-12,5) and b(12,29) find the point that divides the line segment ab three-eighths of the way from a to b

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

Find │7│. a. 1 over 7 b. –7 c. 7 asap i always mark brailiest who me so