A student has to sell 2 books from a collection of 6 maths, 7 science, and 4 economics books. How many choices are possible if
1.1) both books are to be on the same subject?
1.2) the books are to be on different subjects?

sup

step-by-step explanation:

7 ft 6 in means 7 1/2, because 6 in is 1/2 of a foot. 7 ft 8 in means 7 2/3 because 8 in is 2/3 of a foot. 23/3 = 7 2/3. 15/2 = 7 1/2.

23/3   *   15/2   = 57 1/2

step-by-step explanation:

she would want to sell 10 full-year subscriptions and at least 9 half-year subscriptions to get a total of at least $300. 

i hope this answer you! if you have any further questions or concerns, feel free to ask! : )

step-by-step explanation:

mark brainliest!

47 - 90 = 43

43 - 180 = x

x = 137