Haven’t done this in a while but the first is rational, second is irrational, third is rational, fourth is irrational, fifth is rational, sixth is rational, seventh is irrational
Answer:
5=b
Step-by-step explanation:
Eliminate the parenthiesies --> n-2+7 = bn
Move the variables to one side (they cancel eachother out) --> -2+7 = bn
Solve --> 5=b
![\bf \textit{surface area of a cylinder}\\\\ SA=2\pi r(h+r)~~ \begin{cases} \textit{units all tripled}\\ h=3h\\ r=3r \end{cases}\implies SA=2\pi (3r)(3h+3r) \\\\\\ \begin{cases} r=\stackrel{mm}{4}\\ h=\stackrel{cm}{1.5}\\ ~~~~\stackrel{mm}{15} \end{cases}\implies SA=2\pi (12)(45+12)\implies SA=24\pi (57) \\\\\\ SA=1368\pi](https://tex.z-dn.net/?f=%20%5Cbf%20%5Ctextit%7Bsurface%20area%20of%20a%20cylinder%7D%5C%5C%5C%5C%20SA%3D2%5Cpi%20r%28h%2Br%29~~%20%5Cbegin%7Bcases%7D%20%5Ctextit%7Bunits%20all%20tripled%7D%5C%5C%20h%3D3h%5C%5C%20r%3D3r%20%5Cend%7Bcases%7D%5Cimplies%20SA%3D2%5Cpi%20%283r%29%283h%2B3r%29%20%5C%5C%5C%5C%5C%5C%20%5Cbegin%7Bcases%7D%20r%3D%5Cstackrel%7Bmm%7D%7B4%7D%5C%5C%20h%3D%5Cstackrel%7Bcm%7D%7B1.5%7D%5C%5C%20~~~~%5Cstackrel%7Bmm%7D%7B15%7D%20%5Cend%7Bcases%7D%5Cimplies%20SA%3D2%5Cpi%20%2812%29%2845%2B12%29%5Cimplies%20SA%3D24%5Cpi%20%2857%29%20%5C%5C%5C%5C%5C%5C%20SA%3D1368%5Cpi%20%20)
now, recall, the exercise is assuming you're using π = 3.14.
Step-by-step explanation: