So we know that the perimeter is 1260 feet and that the length is 100 more than the width, but we don't know that the width is.
So we're going to start with finding the width.

from there we need to combine like terms

now we have

From there, we will need to remove 100 from both sides, leaving us with

now we'll need to divide both sides by 2


We now know that the width is 580, or more simply put, x=580.
Finding the length will be the easy part, as we know that it is just 100 more than the width

If you want an easier way of finding the length, just subtract the width from the perimeter.

Leaving the final answer to be
Width = 580
Length = 680
11+6=17 17÷2= 8.5 hours so the answer would be 4:50pm. Maybe
Let
x--------> <span>the speed of the boat in mph
we know that
</span>going upstream the speed is x-7
<span>going downstream the speed is x+7
</span>
let the distance be d
<span>time to go upstream = d/(x-7) </span>
<span>time to go downstream = d/(x+7)
</span>
time going upstream is 3 times going downstream
so
<span>3d/(x+7) = d/(x-7) </span>
<span>divide by d </span>
<span>3/(x+7) = 1/(x-7) </span>
<span>3x-21 = x+7 </span>
<span>2x = 28 </span>
<span>x = 14
</span>
the answer is
<span>the speed of the boat in still water is 14 mph</span>
If two angles are supplementary, their sum equals 180 degrees