Step-by-step explanation:
f = 2, e = 7
5f² - 2e = 5×2² - 2×7 = 5×4 - 14 = 20-14 = 6
6(e+f)/f = 6×(7+2)/2 = 6×9/2 = 3×9 = 27
so, as 6 < 27, the fitting inequality sign here is "<" (smaller).
