12/910 which simplifies to 6/455.
Explanation:
Take the amount of crates holding dogs over the total amount of crates
Hmm, the slope is undefined. But like what exactly are you looking for as an answer?
The answer is c because if you do 7x60 you'll get 420 and 830-420=410 and 7x80 you'll get 560 and 970-560 is also 410.