Pythagoras
28^2-19^2= 423
Square root of 423 = 20.5669638
Answer = 20.5669638
13, because 78 postcards divided by 6 cards per board = 13 poster boards
I think its 1/2…hope this helps id it dont then.....:\¯\_(ツ)_/¯
Steps to solve:
3(5x - 8) = 6x + 39
~Distribute left side
15x - 24 = 6x + 39
~Add 24 to both sides
15x = 6x + 63
~Subtract 6x to both sides
9x = 63
~Divide 9 to both sides
x = 7
Best of Luck!
