An adult blinks about 450 times in 30 minutes. a 12 -year old blinks about 150 times in 15 minutes, how many more times does an adult blink in 60 minutes than a 12 year old?

Acentral angle measuring 160 degrees intercepts an arc in a circle whose radius is 4. what is the length of the arc the circle formed by this central angle? round the length of the arc to the nearest hundredth of a unit. a) 4.19 units b) 6.28 units c) 12.57 units d) 12.57 square units