lim ((x^2+4)^1/2 -2)/x^2
x->0
120*x + 144*x^2
3 (9/2)
express 13cm in cm and mm
$6^{4x-1}$ = 0
538427
809565
149503
119401
6240012
3233792
$20^{2}$ - 400
25x/2*16=352
2x/3+1 = 7x/15+3
6/7 x 14/18
