Calculate the distance between the points K=(-1, 2) and E=(2, -1) in the coordinate plane

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

Agc and bgd are vertical angles

The answer is 41.7 because 1.39 times 30 is 41.7