According to the website space.com, the distance from the sun to the earth is 149,597,870,700 meters and the speed of light is 299,792 kilometers per second. recalculate the time that it takes sunlight to reach the earth using these metric measurements. what time (to the nearest second) do you get now? if it is not the same as 8 minutes and 20 seconds, explain what accounts for the difference.

I got 499 seconds, the difference may be because of the conversion from meters to kilometers in order to calculate the time

As per the question, the recommended heart rate (beats per minute) can be represented by the expression 0.7(220-a), i.e. 0.7 * (220-a), where a is the age of the person.

We have to determine the recommended heart rate for a 20-year old person.

Substituting the value 20 for a in the expression

⇒ Recommended heart rate = 0.7 * (220 - 20)

⇒ Recommended heart rate = 0.7 * (200)

⇒ Recommended heart rate = 140 beats per minute