For 2a, we plug 3 in to get (4*3+3)/(3^2-7)=15/2. Since 2 is a prime number and 15 is not divisible by 2, this is simplest form. For b, using PEMDAS, division goes before addition or subtraction and 3/3^3 would therefore be done and you could not add 4*3 beforehand (or subtract 7).
For 4a, we plug it in to get sqrt(25-(-3)^2)=sqrt(25-9)=sqrt(16)=4
For b, since 13^2=169 and 25-169 is negative, we cannot find the square root due to that nothing squared is negative.
Check the picture below.
F = sales for Friday
we know that the total of weekend sales for Germany was F + 317 + 405.
we also know that 405 is really 37.19% of that amount, say "x", which is the 100%, so
![\begin{array}{ccll} amount&\%\\ \cline{1-2} 405&37.19\\ x&100 \end{array}\implies \cfrac{405}{x}=\cfrac{37.19}{100}\implies 40500=37.19x \\\\\\ \cfrac{40500}{37.19}=x\implies 1089~\approx ~ x \\\\[-0.35em] ~\dotfill\\\\ \stackrel{friday}{F} + \stackrel{sat/sun}{317} + \stackrel{monday}{405} \approx 1089\implies F +722 \approx 1089\implies \boxed{F\approx 367}](https://tex.z-dn.net/?f=%5Cbegin%7Barray%7D%7Bccll%7D%20amount%26%5C%25%5C%5C%20%5Ccline%7B1-2%7D%20405%2637.19%5C%5C%20x%26100%20%5Cend%7Barray%7D%5Cimplies%20%5Ccfrac%7B405%7D%7Bx%7D%3D%5Ccfrac%7B37.19%7D%7B100%7D%5Cimplies%2040500%3D37.19x%20%5C%5C%5C%5C%5C%5C%20%5Ccfrac%7B40500%7D%7B37.19%7D%3Dx%5Cimplies%201089~%5Capprox%20~%20x%20%5C%5C%5C%5C%5B-0.35em%5D%20~%5Cdotfill%5C%5C%5C%5C%20%5Cstackrel%7Bfriday%7D%7BF%7D%20%2B%20%5Cstackrel%7Bsat%2Fsun%7D%7B317%7D%20%2B%20%5Cstackrel%7Bmonday%7D%7B405%7D%20%5Capprox%201089%5Cimplies%20F%20%2B722%20%5Capprox%201089%5Cimplies%20%5Cboxed%7BF%5Capprox%20367%7D)
Answer:
non-linear it's parallel line
Gttftvtvtvtvvtvtvfcfcfcfcfcfcfcfcfcfcfcfcfcfcfcfcfcfcfc
