Answer:rectangular pyramid
Step-by-step explanation:The cross section is a rectangle. Note that not all cross sections of a rectangular prism are rectangles. Figure 4 shows the cross section of a right rectangular pyramid parallel to its base.
(i have no idea if this is right or not i learned this form my teacher.)
15x-6+x-3=39
16x-9=39
16x=39+9
16x=48
x=48/16
x=3
Thomas is right, his radical expression is indeed rational because when converting to radical form it equals 3, a whole number.
