When trains travel at high speed the air resistance (R varies as the square of the speed (V km/h). (aIf the air resistance is 8100 newtons when the speed is 60 km/h find , in the form of an equation , the relation between Rand V.

goog may have it for you

the equation cos(35) =a/25 can be used to find the length of bc what is the length of bc? round to the nearest tenth

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)