Angle lmp and angle pmn are complementary. find the value of x.

x=15

Complementary means they add to make 90 degrees.
This means 2x+4x=90

2x+4x=90
combine like terms
6x=90
divide 6 from both sides
x=15

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