Which expression has a value of 4 a: (21- 3) x (7 + 4) or b: 21 - 3 x 7 + 4 or (14 divided by 2) x 3 + 4 or c: 3 x 7 -14 + 4

I'm being volume of cylinder with 13 in. radius and 30 in height answer choices in pic

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

If angle 2=3x +1 and angle 3=2x +4what is angle 2