Is y=9 a hoizontal line

The diagram shows a 7cm by 6cm rectangle based pyramid. all the diagonal sides - ta, tb, tc and td are length 10cm. m is midpoint of rectangular base. work out height mt to 1 decimal place

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

True or false? a circle could be circumscribed about the quadrilateral below.