Which statement correctly defines the term scientific theory?
a)an approximation that makes the experiment easier
b)an explanation for observable phenomena
c)an understanding that is accepted as true
d)an assumption that is generally accepted as correct

B) an explanation for observable phenomena.

Explanation:

All theories have been stated by experiments and natural phenomenas.

the first american roller coaster was the mauch chunk switchback railway, built in the mountains of pennsylvania in the mid-1800s. the track, originally built to send coal to a railway, was reconfigured as a "scenic tour."

the old price per ounce is c/4.

the new price per ounce is c/3.6.

the ratio of the old price to the new one is

(c/4)/(c/3.6) = (c/c)×(3.6/4) = 0.9 . . = 9/10 . . "nine tenths" in either form