Asphere has a diameter of 7 centimeters. what is the surface area? use 3.14 to approximate pi. round to the nearest hundredth if necessary

The approximate surface area is 153.86 square cm.

1. 0.3 •4 is the same as 4 groups of 0.32. 7•0.8 is the same as 7 groups of 0.83. it increases by 0.5 every time, so 0.5x4 it increases by 0.9 every time, so 0.9x5. 0.9•12=10.86. 0.47•5=2.35i can finish the next ones in a separate post