24-(6+3) in words and can be in a word problems

Which of the fallowing best completes the sequence 12,8,5, a) 1 b) 2 c)4 d)0

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

The longer leg of a 30° 60° 90° triangle is 16 times square root of three how long is a shorter leg