I believe the answer would be D.
80$ I think is the answer let me know if I'm wrong
Answer:
one is equal
Step-by-step explanation:
this is asking which 2 paired items have the same fractional ratio I believe. So all we have to do is make ratios of price to item amount and see if they are equal.
1. 4.5/3 = 6/5
this one we divide numerator and denominator of left side by 1.5 and get:
3/2 = 6/5
this is not true so wrong
2. 5/2 = 15.25/6
2.5 = 2.5416666
sometimes easier to use calculator then reduce. But not equal so wrong.
3. 4.75/5 = 9/10
95/100 = 9/10
wrong
4. 9/4 = 13.5/ 6
4.5/2 =4.5/2
this one is equal
![\bf \begin{cases} r=\textit{rate of the plane}\\ w=\textit{rate of the wind}\\ \end{cases} \\\\ \begin{array}{ccccllll} &distance&rate&time(hrs)\\ &\textendash\textendash\textendash\textendash\textendash\textendash&\textendash\textendash\textendash\textendash\textendash\textendash&\textendash\textendash\textendash\textendash\textendash\textendash\textendash\textendash\textendash\\ \textit{with wind}&630&r+w&1\frac{1}{2}\\ \textit{against wind}&1120&r-w&4 \end{array} ](https://tex.z-dn.net/?f=%5Cbf%20%5Cbegin%7Bcases%7D%0Ar%3D%5Ctextit%7Brate%20of%20the%20plane%7D%5C%5C%0Aw%3D%5Ctextit%7Brate%20of%20the%20wind%7D%5C%5C%0A%5Cend%7Bcases%7D%0A%5C%5C%5C%5C%0A%0A%5Cbegin%7Barray%7D%7Bccccllll%7D%0A%26distance%26rate%26time%28hrs%29%5C%5C%0A%26%5Ctextendash%5Ctextendash%5Ctextendash%5Ctextendash%5Ctextendash%5Ctextendash%26%5Ctextendash%5Ctextendash%5Ctextendash%5Ctextendash%5Ctextendash%5Ctextendash%26%5Ctextendash%5Ctextendash%5Ctextendash%5Ctextendash%5Ctextendash%5Ctextendash%5Ctextendash%5Ctextendash%5Ctextendash%5C%5C%0A%5Ctextit%7Bwith%20wind%7D%26630%26r%2Bw%261%5Cfrac%7B1%7D%7B2%7D%5C%5C%0A%5Ctextit%7Bagainst%20wind%7D%261120%26r-w%264%0A%5Cend%7Barray%7D%0A)
![\bf thus \begin{cases} 630=(r+w)1\frac{1}{2}\to 630=(r+w)\frac{3}{2} \\\\ 1120=(r-w)4\\ --------------\\ 630=(r+w)\frac{3}{2}\implies 630\cdot \frac{2}{3}=r+w\\ 420=r+w\implies \boxed{420-w}=r\\ --------------\\ thus\\ --------------\\ 1120=(r-w)4\implies 1120=4r-4w \\\\ 1120=4(\boxed{420-w})-4w \end{cases} ](https://tex.z-dn.net/?f=%5Cbf%20thus%20%20%5Cbegin%7Bcases%7D%0A630%3D%28r%2Bw%291%5Cfrac%7B1%7D%7B2%7D%5Cto%20630%3D%28r%2Bw%29%5Cfrac%7B3%7D%7B2%7D%0A%5C%5C%5C%5C%0A1120%3D%28r-w%294%5C%5C%0A--------------%5C%5C%0A630%3D%28r%2Bw%29%5Cfrac%7B3%7D%7B2%7D%5Cimplies%20630%5Ccdot%20%5Cfrac%7B2%7D%7B3%7D%3Dr%2Bw%5C%5C%0A420%3Dr%2Bw%5Cimplies%20%5Cboxed%7B420-w%7D%3Dr%5C%5C%0A--------------%5C%5C%0Athus%5C%5C%0A--------------%5C%5C%0A1120%3D%28r-w%294%5Cimplies%201120%3D4r-4w%0A%5C%5C%5C%5C%0A1120%3D4%28%5Cboxed%7B420-w%7D%29-4w%0A%5Cend%7Bcases%7D%0A)
solve for "w", to find the wind's speed rate,
so hmmm what's the plane's rate? well 420 - w = r :)
A= x^2+2x-6
B= x^3-x+5-(28/x+3)