Width -
x ft.
Length -
(x+6)ft.
x(x+6)=315
x²+6x-315=0
a=1, b=6, c=-315
D=b²-4ac=36+4*1*315=1296, √D=√1296=36
![x = \frac{-b+/- \sqrt{D} }{2a} \\ \\ x= \frac{-6+/-36}{2} \\ \\ x=15, x=-21](https://tex.z-dn.net/?f=%20%20x%20%3D%20%20%20%5Cfrac%7B-b%2B%2F-%20%5Csqrt%7BD%7D%20%7D%7B2a%7D%20%0A%5C%5C%20%5C%5C%20x%3D%20%5Cfrac%7B-6%2B%2F-36%7D%7B2%7D%20%0A%5C%5C%20%5C%5C%20x%3D15%2C%20x%3D-21)
For the width we can use only positive number.
The width =
15 ft.
The length =15+6=
21 ft.
Check :
Area =15*21=315 ft²
0.35+0.2+.25
=0.55+0.2
=0.57
=57/100 miles
Answer:
24
Step-by-step explanation:
T represents the number of hours at speed of 25 mph, while m represents number of hours at 45 mph