Riku wrote the expression –13 - 5 for this situation on the previous screen:
The temperature was -13°F and then fell 5 degrees.
What was the final temperature?
Charlie wrote the expression -13+ (-5).
Who is correct?

Riku And Charlie Have Precise Answers.
The Temp. Is -18 Degrees And...
-13 + (-5) = -18
-13 - 5 = -18

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