30% of _ is 60 what goes in the blank?

3(10x-y)-5(x-y^2) need this solved asap

The scatter plot shows the number of animal cells clara examined in a laboratory in different months: plot ordered pairs 1, 20 and 2, 60 and 3,100 and 4, 140 and 5, 180 what is the approximate predicted number of animal cells clara examined in the 9th month?

Which term describes the point where the perpendicular bisectors of the three sides of a triangle intersect?