Answer:
-21/5 = -5.25 or -5
Step-by-step explanation:
It is so because I estimated the -21.87 to -21 because of the 8 being higher than five. I estimated the 4 to 5 because of the 7 being higher than five also.
Do you have the rest of the question?
#5
Area = Area of bigger triangle - Area of small triangle
#8
Area = area of square + area of two right angled triangles
4+8=12