21n over 9n in lowest terms

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

What are the domain and range of the function? f(x) = -4 (sqrt)x

State if the two triangles are congruent. if they are, state how you know?