(2 1/4)-0.8÷(-0.5)x(-1/4)

D( x )

x = 0

x = 0

x = 0

x in (-oo:0) U (0:+oo)

0.5/x-0.8 = 0.7/x // - 0.7/x

0.5/x-(0.7/x)-0.8 = 0

0.5/x-0.7*x^-1-0.8 = 0

-0.2*x^-1 = 0.8 // : -0.2

x^-1 = -4

-1 < 0

1/(x^1) = -4 // * x^1

1 = -4*x^1 // : -4

-1/4 = x^1

x = -1/4

x = -1/4

a net is a diagram that shows a “flattened” view of a solid. in a net, each face and base is shown with all of its dimensions. a net can also serve as a pattern to build a three-dimensional solid.

a pyramid is a three-dimensional object with a base that is a polygon and triangular faces that meet at one vertex.

" the net of a triangular pyramid consists of four triangles. the base here we are given of the pyramid is a equilateral   triangle, and the lateral faces are also triangles "

step-by-step explanation:

hans did not square the 40-unit side; he merely multiplied it by 2.   incorrect.