It is estimated that in china, more than 54,860,000 children take piano lessons.

which shows this number rounded to the nearest ten million?

a.
50,000,000

b.
55,000,000

c.
58,000,000

d.
60,000,000

The heaviest 16% of all men in weight weigh more than how many pounds ?

Lance lived in portugal and brazil for a total of 14 months to learn portuguese. he learned an average of 130 new words per month when he lived in portugal, and an average of 150 new words per month when he lived in brazil. in total he learned 1920 new words. write a system of equations to represent the situation. use x to represent portugal, and y to represent brazil

What does independent variable and dependent variable mean in math?