The length of the field is 48 yard while the width of the field is 16 yards.
My Work/Reasoning:
Say that the width is "x" yards.

The length of the field is three times longer than the width.

The perimeter of the rectangle is 128 yards.

To get the perimeter of a rectangle you multiply the sum of the length and the width by two.

Then you follow order of operations and add x and 3x.

Then you multiply.

After that, you divide 8 on both sides to get the width (total) in yards.

Then you divide that to get the width.

Finally, to get the length of the field, you multiply the width of the field by three to get its length.
Answer: 1.2miles
Step-by-step explanation:
Divide 15 by 50 to get how far she rides in 1 minute that multiply that by 60 to get how far she rides in 1 hour.
Answer:
approximately 4.978%
Step-by-step explanation:
The probability of both happening is 3/13*11/51, or 33/663, or 11/221 (approximately 4.978%). Two cards are drawn one after the other with replacement from a pack of 52 cards.
Answer:
91%
Step-by-step explanation:
We can use the formula 
- "is" is 90
- "of" is 99
- "percent" is what we are solving for so we will denote it as x
Substituting in our values we get 
- We will need to cross multiply here to get (90)(100) = (x%)(99)
- This simplifies to 9000 = 99x%
- Dividing by 99 on both sides we get 90.9% → x = 91%
Answer: -66.67%, but if the answer is supposed to positive then the answer is 66.67%.
<em>* Hopefully this helps:) </em>