7.98+4.89+5.12=17.99 so the estimate would be 18.
Answer:

Step-by-step explanation:
Given:

Let's substitute -3 for 

Now, let's solve



Hope this helps
Answer:
Yes, her calculation is correct. The value of 40% of 75 is 30.
Step-by-step explanation:
The value of 40% of 75 is

The value of
of 75 is

From the above calculation it is noticed that the value of 40% of 75 and
of 75 are same, therefore the calculation is correct and the value of 40% of 75 is 30.
Answer: 2:7 times
Step-by-step explanation: hope it helps u