Trig Help ( verify answers)

Convert the angle given in degrees to radian measure in terms of http://edugen.wiley.com/edugen/share...=1234968801499.380°

i got 6.63 rad

http://edugen.wiley.com/edugen/share...=1234952186244 to 4 sig.figs

1.018

Solve the equation http://edugen.wiley.com/edugen/share...=1234952251705 for all nonnegative values of http://edugen.wiley.com/edugen/share...=1234968801914 less than http://edugen.wiley.com/edugen/share...=1234968801914 . Do by calculator, if needed, and give the answers to three significant digits in the order of increasing.

(not sure what to do)

A satellite is in a circular orbit 225 km above the equator of the earth. How many kilometres must it travel for its longitude to change by 86.3°?

Assume the radius of the earth equals 6400 kilometres.(round to the nearest whole number)

i got 9639.80 =9600