Whats 0.235 in expanded form?

Olivia uses the work below to determine 55% of 720 which explains the error in olivia’s solution

Find the vertex of the function given below y=x^2-6x+1

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