Please help me What is 90/80*70-60+50/40*30-20+10/84*75*12 -99+1223
If answers correctly you get a brainliest

With this one. will mark brainliest

He mass of a single atom of carbon can be found by dividing the atomic mass (12.01 g) by 6.022 x 10^23. which is the mass of a single carbon atom, correctly written in scientific notation with the correct number of significant figures?

Which part of a 2-column proof is the hypothesis of the conjecture? a) given b) reasons c) prove d) statements ! i think it's b but i'm not quite