need help please

ok i don't get this one in 1920 the record for a certain race was 45.9 sec in 1980 it was 44.1 sec let r (T) = the record in the race and t= the number of years since 1920 (a) find a linear fuction that fits the data (b) use the funcation in (a) to perdic...

how many decimal digits are needed to represent the value of 234^789? Express in scientific notation to at least two significaant digits: 234^789

A 63.8 N crate is pulled up a 5.22 m inclined plane by a worker at constant velocity. If the plane is inclined at an angle of 59 degree to the horizontal and there exists a constant frictional force of 32.6 N between the crate and the surface, what is the...

Energy Systems Portfolio please help me its 2 weeks overdue.

so what yr will it be 43.20

so r(t)=?

please help me