What should i do- this is hard

If point cis between points a and b, then ac + — = ab

Which graph represents the function f(x)=4[x]?

You are living in aldine, tx and you are planning a trip to six flags in arlington, tx. you look on a map that has a scale of 0.5 inches to 30 miles. if the map shows the scale distance from aldine to arlington is 4 inches, how far is the actual distance?