9514 1404 393
Answer:
27/32
Step-by-step explanation:
2x³ for x = 3/4 is ...
2(3/4)³ = 2·3³/4³ = 2·27/64 = 27/32
(-x + 4) + (3x + 2)
= 2x + 6
-- The first train leaves the station,going 50km/hr.
-- 3 hours later, when the 2nd train starts out, the first train
has covered (3 x50) = 150 km.
-- When they're both moving, the 2nd train gains (90 - 50) = 40km
on the first train each hour.
-- The second train gains the 150km that he was behind, and overtakes
the first train, in (150 / 40) = 3.75 hours .
-- In that 3.75 hours, the second train has covered (3.75 x 90) = <em>337.5km</em> ,
and that's the distance from the station to the place where they 'meet'.
