How many 3-digit numbers can you write using only digits 1 and 7 if the digits can repeat?

Me complete this proof! prove that a quadrilateral is a square. me with the steps for this proof.

A3-dimensional figure has a square base and 4 lateral faces that meet at a point. explain the difference between the cross sections when a slice is made perpendicular to the base through the vertex, and when a slice is made perpendicular to the base and not through the vertex

What value is a discontinuity of x squared plus 8 x plus 4, all over x squared minus x minus 6?