Solveit

$\angle AOC=\angle POB=66$

put in terms of x  0 :

log(2) = 0.3010299956639812

Answer: 0.301

'2nd" button "acos"

atan(2+sqrt(3) = 75

$4+7(n-1)$

it is unsolveble but if you will take them one by one:

2x=-6

x=-3

2x=10

x=5

i think:

x is a multiple of 10

$a=x+7 \\ b=x+5 \\ (a+b)\times9=(2x+12)\times9\\ \frac{18x+108}{10}=\frac{(18x+100)+8}{10}$

so the remainder is always 8

 $\begin{array}{rcll} 4x^2 &=& 3x\\ 4x^2-3x &= & 0\\ x(4x-3) &=&0\\ \boxed{ x_1=0\;\;\; x_2=\frac34} \end{array}$

935*0.6 = 561