7. In the following diagram, D and E lie on sides AB and AC such that DE || BC as marked. It is known that AD = 18 and DB = 12.
Men
prein. se
(a) Give a dilation that would map BC onto DE. State both the center of the
dilation and the scaling factor. Y=
cerer
74
2
20
B
(b) If BC = 15 and AC = 20, then find the perimeter of AADE. Show how you arrived at your answer.

7. the area of the playing surface at the olympic stadium in beijing isof a hectare. what area will it occupy on a plan drawn to a scaleof 1: 500?

Lola says these two expressions have the same value. expression a expression b which explains whether lola is correct?

This is a rational expression because the denominator contains a variable. this is a polynomial with 3 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 4 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 4 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 3 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 5 terms.