Answer:
a. fill in 8out of the 10 rows of the grid. Then subtract 3/10ths of the squares that are filled in
b. 70/100 x 8/10 = 14/25 kg
c. 0.7 x 0.8 = 0.56 kg
d. less, by 0.24 kg
I hoped this helped! :)
The first one ....i belive.
That's just the distance between 2 points
the distance between (x1,y1) and (x2,y2) is

we can find the distance between S and Q or P and R
S and Q is (0,0) and (a,b)


distance between P and R is between(0,b) and (a,0)




so the lengths of diagonals are congruent