which statement is not true about variable?

Question

a a variable is used to represent a qty whose values may change or vary

b letters are often used as variable

c a variable is a rule showing relationshopms amount quantities

d known values can be substitues for variale s ina formula

i picked letter c

which is expressions below is not equivalent to -8 - (-8)?
a -8 +8 b o
c 8 -8 d -8 + (-8)
i picked: d

use metal math to simplify
-4 + (-6) - (-4)-(-7)
a) -21
b) 21

c) 1

d) 0

i picked c 1

Answer 1

Right.