The rate constant for the first-order decomposition of a compound A in the reaction 2 A --7

Question:

The rate constant for the first-order decomposition of a compound A in the reaction 2 A --7 P is k = 2.78 X 10.7 S·1 at 25°C. What is the half-life of A? What will be the pressure, initially 32.1 kPa, at?
(a) 10 s,
(b) 10 min after initiation of the reaction?