Acircle that has a radius of 6 units has a circumference of 37.68 units. what is the circumference of a circle that has a radius of 24 units?

602.88 units
150.72 units
904.32 units
678.24 units

For the rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. for an 10 month period, the last term is and the series sum is . for a 15 month period, the last term is and the series sum is . for a 20 month period, the last term is and the series sum is