What number on the number line represents 5 inches below ground

When a formula is solved for a particular variable, several different equivalent forms may be possible. if we solved a=1/2bh for h, one possible correct answer is h=2a/b . which one of the following is not equivalent to this? a. h= 2(a/b) b. h= 2a(1/b) c. h= a/1/2b d. h= 1/2a/b

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

Can someone tell me if this is perpendicular? !