Find the value of sin-1(tanpi/4)

A.0
B. pi
C.2
D. pi/2

If you are trying to move an attached term across the equal sign (=), what operation would you use to move it?

Use multiples to write two fractions equivalent to 7/9. 14/18, 8/10 6/8, 21/27 10/12, 28/36 14/18, 21/27

Which of the following contains a variable?