A chemist measures the temperature in degrees Fahrenheit of a chemical

compound every hour. The temperatures approximate a geometric sequence where

an is the temperature at a given hour, and n is the hour. At hour 4, the temperature is

70 °F and at hour 6 the temperature is 80 °F.

Pls include the value of A1 A4 A6 and r thanks

Step-by-step explanation:

The formula for calculating the nth term of a Geometric Sequence is given as: where n is the number of term, r=common ratio and a=first term.

At hour 4, the temperature is F

.......(i)

At hour 6 the temperature is 80°F.

......(ii)

Solving (i) and (ii) simultaneously

Plugging r into equation (i), we could use (ii) as well,

=57.29

Therefore:

54 kilometers per hour

step-by-step explanation:

according to rules:

1 km = 1000 meter

which means that 1 meter = 1/1000 km

1 hour = 3600 second [ as 1 hour = 60 min = 60 *60 seconds ]

which means that 1 second = 1/3600 hour

therefore, 1 kilometer/hour =

thus to convert 15 meter per second to kilometer per hour, we multiply 15 to 3.6 kilometer/hour.

15 meter/second=   which is the required answer.