Explain how you can use properties of operations as strategies to evaluate each expression using mental math. Then evaluate the expression. a. 0.6+12.7+1.4+2.3
b. 4.5 + 3.9 + (−0.5) + (−4) c . 8 35 − 9 12 + 1 25
d. 485+678−385

a) 17

b)  3.9

c) 0.48

d) 778

Step-by-step explanation:

I could use properties of operations as strategies to evaluate each expression using mental math by using PEMDAS, for example i could use distributive property in some decimals.

he spend 5.1 minutes chatting with his friends.

step-by-step explanation:

2/5+1/2=9/10

6/1-9/10=5.1