How do you explain that 0.9 is equivalent to 0.90?

it is equivalent because if you the zero to 0.9 then you will see that 0.9 and 0.90 are the same numbers.

Step-by-step explanation:

a) 0.25x times 3. (could be wrong on equation.)

b) 2.25 pound of dark chocolate. (can i eat all the chocolate? plz? anyway, again, could be wrong, but i hope im right. all the chocolate together should be 5.25 pounds)

have a good day!