What do you mean by annuity?

Ano ang pag kakaiba ng english system at metrix system

I'll like you correct answers and if you are late you can write it on the i need answers here.the sum of 1/2 and 3/6 increased by 5/9 is ​

[tex] {6x}^{2} \sqrt{x} - 2x \sqrt{ {x}^{3} } [/tex]​