The average value of f(x) over [2, 6] is given by the definite integral,
![\displaystyle f_{\rm ave[2,6]} = \frac1{6-2} \int_2^6 3\ln(2+x^3)\cos(x) \, dx](https://tex.z-dn.net/?f=%5Cdisplaystyle%20f_%7B%5Crm%20ave%5B2%2C6%5D%7D%20%3D%20%5Cfrac1%7B6-2%7D%20%5Cint_2%5E6%203%5Cln%282%2Bx%5E3%29%5Ccos%28x%29%20%5C%2C%20dx)
and is approximately -1.67284.
THE ANSWER IS 82 DEGREES! YOUR WELCOME
So 2x+12=5x-9
you want all of the unknowns on one side and all of the known values on the other or
subtract 2x from both sides
12=3x-9
add 9 to both sides
21=3x
divide both sides by 3
7=x
Fraction would be 30/100 and decinal would be .30 and ratio would be 30/100