It say estimate each problem to check if the students answer is reasonable. If not , Cross out the answer and write the correct answer. Show Your Work

2)        :   given answer    is incorrect

Step by step explanation:

Step 1:

Split the question as,

Step 2:

Add whole number and fractions individually, it becomes

=

=  

can be written as   (correct answer)

3)  -4.2 - (-2.9)    :  given answer - 1.3 is correct

calculated as

- 4.2 + 2.9 = - 1.3

4)   :  given answer is incorrect

Step by step explanation:

Step 1:

Split the question as,

Step 2:

Add whole number and fractions individually, it becomes

=

=

=

can be written as      (correct answer)

10.416 m/s

step-by-step explantion:

distance=100m

time= 9.6s

average speed=100/9.6

=10.416 m/s