40% of what number is 82

round to the nearest tenth

try and do the last calculation on your own, but I'll tell you how to get there!

Step-by-step explanation:

so, you can set up a proportion.

40 over 100 is equal to 82 over x. and then you solve and get your answer.

you didn't post any answer choices, so its not 100% clear what your teacher is looking for

however, log(15/7) is equivalent to log(15) - log(7)

i'm using the rule log(x/y) = log(x) - log(y)

i believe that the answer is

b. y-1=-2(x-4)

hope this !