Fill in the blanks to complete equation 3/8

What is the quotient of -3/8and-1/3?

The sum of 5consecutive even numbers is 100. what is the first number in this sequence?

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