Air is pumped into the balloon so that it's radius doubles every 10 seconds using 3.14 as an approximation for pie, find its surface area after 30 seconds round to the nearest tenth

Step-by-step explanation:

Let the balloon be a sphere and surface area = ⁴/₃πR³

After 30 seconds, radius will be 4R

Let R = 1cm, After 30 seconds R = 4 cm

Hence surface area = ⁴/₃π (4R) ³ = 26794667R³ = 1071.7867 cm² ≅ 1070 cm²