Solveit

\(a^3=x\\ 8x^2-19x-27=0\\ (x+1)(8x-27)\\ x_1=-1\\ x_2=\frac{27}8\\ a_1=\sqrt[3]{-1}=-1 \\ a_2=\sqrt[3]{\frac{27}{8}}=\frac32\)

yes i understood exactly opposite one :/ . Stupid question :)

Thank you Guest !

But how did you found that 6/10 are red

\((3\ cos\ x) - (2\ sin\ x) = 0\\ 3\cos\ x=2\sin\ x\\ 3=2\times(\frac{sin \ x}{cos \ x}) \\ 3=2\times tan \ x\\ \frac32=tan \ x \\ tan^{-1}x=56.30993247402\)

2             

how many lefts ?

57-9=48

how much days we can ate apples?

it depends

but if you will ate 9 apples every day:

48/9 = 5.3333333333333333

Answer: 6 d

That is it i get it Thank you very much Alan !

But what if i wanna to find probability that there is only 88 residents outside of US:

nCr(400, 88)*0.8^312*0.2^88 = 0.0294786177861719029113601772508066971031878720367673319179859403

nCr(400, 312)*0.8^312*0.2^88 = 0.0294786177861719029113601772508066971031878720367673319179859403

0.8 and 0.2 how it is posible i can t understand i know tha one of them is Pin and the other Pout

sorry that i am asking proisaic questions i just wanna to understand

why 50% ? :D