Let
y-------> number of books read during the month
x------> number of picture of a book
we know that
in this problem
for
calculate y
therefore
the answer is
The number of books read during the month is
If u use scientific notion the answer for the first one would be 10^8 the second one would be 10^11 and the last one would be 10^10
Hope that Helps >.< <span />
7 because 7x3= 21 and 21 + the 7 cats comes to an equal 28