69 framed posters beacuse you have to add 9 and 15 and multiply 24 times 6
1. A
2. C
3. B
Hope I helped! :)
The initial diameter of the table is 42", but this diameter is to be extended by 8" (right and left), So the tablecloth will have a diameter of 42+8+8 = 58"
and the radius of the tablecloth = 24"
Let x mi/h be the speed of the boat in still water and y mi/h be the speed of stream.
1) Downstream.
The speed of the boat travelling downstream is x+y mi/h. Then
2) Upstream.
The speed of the boat travelling upstream is x-y mi/h. Then
3) Solve the system of equations:
Add these two equations:
Subtract these two equations:
Answer: the speed of the boat in still water is 21 miles per hour and the speed of the stream is 7 miles per hour.