In the sentence below, which word refers to a mathematical operation? jane has 3 dollars per dollar mark has. a. 3 b. dollars c. per d. the sentence references no mathematical operation

The answer is C. Hope this helped!

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