*answer ASAP*
What signals you that factoring by grouping is the best method to use when factoring a problem? How would you know if it is factorable or prime?

No because if you do the higher number minus the lower number you will get a positive. if you do it the other way around you will get a negative number

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

500 dollars and its probably more than that