cryptoaops

$x-11=7$

Add 11 to both sides: $x-11+11=7+11$

Simplify: $\boxed{x=18}$

$x^2+13^2=85^2\quad :\quad x=84,\:x=-84$

$\log _2\left(3\right)\log _3\left(4\right)\log _4\left(5\right)\log _5\left(6\right)\log _6\left(7\right)\log _7\left(8\right)=\boxed3$

$\mathrm{Slope-Intercept\:form\:of}\:15x-6y=48:\quad y=\frac{5}{2}x-8$

$\textcolor{red}{\text{redacted}}$

Easier to read: The numbers $1,-1$ and $a+1$ are the roots of the equation $x^3+6x^2-2bx-3c-12=0$. Find the values of $a,b,c$.

Easier to understand: A creature on the moon throws a rock off a cliff. the height of the rock above the surface of the moon, in meters, $t$ seconds after it is thrown is given by $h(t) = -t^2 +8t +10$. when does the rock hit the surface of the moon?

Hm, make an acct and message (web2.0calc.com/messagecenter/cryptoaops). talk like that instead.