Use what you know about the properties to rewite each number sentence. use mental math to find the sum. 0.6 + (0.4 + 0.9) = n and (1.57 + 0.75) + 0.25 + n

First Equation:

0.6 +(0.4+0.9) =n

Step 1: do parentheses first:  

0.4+0.9 = 1.3

Step 2: Add 0.6 + 1.3

0.6 + 1.3 = 1.9

n= 1.9

Second Equation:

(1.57 + 0.75) + 0.25 + n

Step 1: do parentheses first:

1.57 + 0.75 = 2.50

Step 2: Add 2.50 + 0.25 = 2.75

Step 3: Add 2.75 and n = 2.75+n

Final

1.9 +2.75+n = 4.65 +n

Hope this helps!!

16.80 times .20= 3.36

step-by-step explanation:

step-by-step explanation:

given that ab is divided into equal parts as

ac, cd, de, ef, fg, gh, hi, ib.

from this we find that f is the midpoint of ab.

so using mid point formula we find

f = (3,7)

similarly considering fb, we get

h = mid point of fb = ((6,6) and g, mid point of fh is

g = (9/2, 13/2)

i is mid point of hb

so i =(15/2,11/2)