Answer:
Move 100 to the left of a
100
a
List of all of the solutions
ax100=100a
12= 100a
A and D... i think but i would rather go with A and C

is true if either of

or

is true. We know

is true, which enough to say that

is also true.
Its actually PEMDAS you forgot the D.
P-parentheses () E-exponents M-multiplication D-division A-addition S-subtraction. <span />