We have two fractions, \dfrac{5}{8} 8
5

start fraction, 5, divided by, 8, end fraction and \dfrac{5}{4}
4
5

start fraction, 5, divided by, 4, end fraction, and we want to rewrite them so that they have a common denominator (and whole number numerators).

step-by-step explanation:

b and c

1/800 is the right answer

its an acute right triangle

step-by-step explanation:

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)