Answer:
The answer is -6 but its not in the option
Step-by-step explanation:
![\frac{ {x}^{2} - 1 }{ x + 1}](https://tex.z-dn.net/?f=%20%5Cfrac%7B%20%7Bx%7D%5E%7B2%7D%20-%201%20%7D%7B%20x%20%20%2B%201%7D%20)
Let x = -5
[(-5)²-1]/(-5+1)
= (25-1)/(-4)
= 24/-4
= -6
First off, let's convert the percentages to decimal format, so our 77% turns to 77/100 or 0.77, and our 55% turns to 55/100 or 0.55 and so on
now, the sum of both salines, must add up to the 77% mixture, let's say is "y"
so, 11 + 4 = y, and whatever the concentration level is, must also sum up to the mixture's concentration of 77%
anyway thus
![\bf \begin{array}{lccclll} &amount&concentration& \begin{array}{llll} concentrated\\ amount \end{array}\\ &-----&-------&-------\\ \textit{first sol'n}&11&x&11x\\ \textit{second sol'n}&4&0.55&2.20\\ ------&-----&-------&-------\\ mixture&y&0.77&0.77y \end{array}\\\\ -------------------------------\\\\ \begin{cases} 11+4=y\implies 15=\boxed{y}\\ 11x+2.2=0.77y\\ ----------\\ 11x+2.2=0.77\cdot \boxed{15} \end{cases}](https://tex.z-dn.net/?f=%5Cbf%20%5Cbegin%7Barray%7D%7Blccclll%7D%0A%26amount%26concentration%26%0A%5Cbegin%7Barray%7D%7Bllll%7D%0Aconcentrated%5C%5C%0Aamount%0A%5Cend%7Barray%7D%5C%5C%0A%26-----%26-------%26-------%5C%5C%0A%5Ctextit%7Bfirst%20sol%27n%7D%2611%26x%2611x%5C%5C%0A%5Ctextit%7Bsecond%20sol%27n%7D%264%260.55%262.20%5C%5C%0A------%26-----%26-------%26-------%5C%5C%0Amixture%26y%260.77%260.77y%0A%5Cend%7Barray%7D%5C%5C%5C%5C%0A-------------------------------%5C%5C%5C%5C%0A%5Cbegin%7Bcases%7D%0A11%2B4%3Dy%5Cimplies%2015%3D%5Cboxed%7By%7D%5C%5C%0A11x%2B2.2%3D0.77y%5C%5C%0A----------%5C%5C%0A11x%2B2.2%3D0.77%5Ccdot%20%5Cboxed%7B15%7D%0A%5Cend%7Bcases%7D)
solve for "x"
Answer:
dont know
Step-by-step explanation:
Answer: 10.5
Step-by-step explanation:
Hope it's right!
#4 is actually f(x) + 18. #5 is f(x) + 201, #5 is f(x) + 316.