Hey there! Start with the slope formula, where 
and 
are the two known points.
Simplify.
Step-by-step explanation:
Let the original speed of the train be x km/h.
Time taken to cover a distance of 360 km = 360/x hours.
New speed of the train = (x+5) km/h.
Time taken to cover a distance of 360 km at new speed = 360/x+5 hours.
Since, the train takes 1 hour less time,
∴360/x - 360/ x+5 = 1
⇒360 (5) = x² + 5x
⇒1800 = x² + 5x
⇒x² + 5x - 1800 = 0
⇒x² + 45x - 40x - 1800 = 0
⇒x (x+45) - 40( x +45) = 0
⇒(x+45) (x-40) = 0
⇒x = (-45), 40
But since speed cannot be in negative.
∴x = 40 km/hr.
Hence, the original speed of the train is 40 km/h.
The circumference of a circle is
since the radius is half of the diameter we can substitute the diameter instead of using 2r. So we get
The we can substitute the given diameter, which is 5 and multiply it by
and get
.
Answer:
It's C because (m^8)^1/4 can simplify to (m^2)
and (n^-4)^1/4 can simplify to (n^-1), which would then become 1/n because it is a negative exponent.
Combine the two and you get: m^2/n
Step-by-step explanation:
