
True

As it is said in the question the probability of getting a head is 0.5. And, if we toss it two times it will be 0.25.
We'll have to multiply 0.5 with 0.5.

3 of 4 is not the correct way of writing a ratio.
Answer:
a. 42 x 39 = 1638 ft²
b. small = 12(large)
small = 12(48)
= 576
576 - 48 = 528 more small posters
here (I need 20 characters in order to send this so don't mind this text)
I don't understand three or two book bags but if it's 2 bookbags then 8.50 if it's 3 bookbags then 5.66 each