Write 12*10^-6 in scientific notation

Hurry which expression is equivalent to 3√x^5y?

42. if 20 men can eat 200 kg of wheat in 40 days, then 10 men can eat 300 kg of wheat in how many days? a) 120 days b) 60 days c) 80 days d) none of these

Three consecutive integers have a sum of 234. what are the three integers