It should be:
-2.7-1.4
-4.1
Answer:
Day 15
Step-by-step explanation: If you know how to find common denominators or numerators, you do that.
If you multiply 5 x 3, it equals 15 days. Does three go into 15? Yes! That means that they will first meet at day 15
Answer:
The maximum speed of Hal's airplane in still air is:

The speed of the wind

Step-by-step explanation:
Remember that the velocity v equals the distance d between time t.
and 
The distance that Hal travels when traveling with the wind is:
miles
Where v is the speed of Hal and c is the wind speed.
The distance when traveling against the wind is:
miles
Now we solve the first equation for v




Now we substitute the value of v in the second equation and solve for c







Then:


The maximum speed of Hal's airplane in still air is:

The speed of the wind

First what you need to do is make 6meters into centimetres so what how many meters in a centimetre
100cm so you do 100 x 6= 600
After that you do 600 divided by 28 then by 78 then you will find the answer.