The temperature is 16f in the morning and drops to -15f in the evening . what the difference between these temperatures ?

31f; A difference in 2 or more numbers means you subtract the two. If anything but this first term has a negative sign, then you still subtract, cancelling out the zeroes.

16-(-15)

16+15

31

The difference in these temperatures is 31f

answer: given that the roller coaster can accommodate 1600 riders per hour, thus the roller coaster can accomodate 1600 / 60 = 26.67 riders per minute.

given that there are 345 people in the line, the number of minutes it will take for the 345 persons to get into the roller coaster is given by 345 / 26.67 = 12.94 minutes.

therefore, it will take you 12.94 minutes to get to the front of the line.

step-by-step explanation: