What is 0.3 repeating as a fraction in simplest form

What is the inverse of the function f(x)=4x+8

Which expression can be used to determine the slope of the line that passes through the points -6, three and one, -9

What is the volume of the cone to the nearest cubic millimeter? (use π  = 3.14) a) 46 mm3 b) 128 mm3 c) 183 mm3 d) 275 mm3 diameter = 5 mm height = 7 mm how do you do this problem step by step?