So I'm given variables and I am being asked to code Bohlin approximation and then I am provided R, but I do not know why it keeps giving me an error and I am not sure why it is giving me an error

(the equal sign is not an error; it's just asking me to put a semi-colon at the end, but I want C to be outputted.

Editor - C:\Userslzkurdo\Documents\ MATLAB\ Untitled.m Untitled.m 1clear:clc 2 3a22.08877 4- a3=0.94813; a1 = 2.10444; 6- 7- 8- a4 = 1 . 372 ; a5= 3.87; a6= 4.19; R=0.2500; Command Window Subscript indices must either be real positive integers or logicals. Error in Untitled (line 9 x 7