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

a. 0
b. pi
c. 2
d. pi/2

Will give brainliest what is the value of x? enter your answer in the box.

Find the volume of the described solid.the solid lies between planes perpendicular to the x-axis at x = 0 and x=7. the cross sectionsperpendicular to the x-axis between these planes are squares whose bases run from the parabolay=-31x to the parabola y = 30/x.a) 441b) 147c) 864d) 882

What is the upper quartile in the box plot?