Help! Determine a so that A(t)=A0a^t describes the amount of radium-223 left after t days, where A0 is the amount at time t=0. Round to six decimal places.

Geometry: determine whether segment mn is parallel to segment kl. justify your answer. jm 6 mk 3 jn 8 nl 4

Gail is making costumes for a school play. each rabbit costume needs one and one half yards of white fur fabric, a yard of blue striped fabric, and a quarter of a yard of pink felt for the ears. g? ail needs to make eight rabbit man yards will she need, for the white fur fabric, blue striped fabric, and pink felt?

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36