Help, please!! It will be appreciated, thank you!

Atriangle with all sides of equal length is a/an triangle. a. right b. scalene c. equilateral d. isosceles

This graph shows which inequality? a ≤ –3 a > –3 a ≥ –3 a < –3

$5400 is? invested, part of it at 11? % and part of it at 8? %. for a certain? year, the total yield is ? $522.00. how much was invested at each? rate?