The profit for a car company can be represented by the function P=−0.5 x² +4 x+ 12,
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Answer:
Step-by-step explanation:
Given: △ABC, D∈AC , m∠BDC=m∠ABC , AD=7, DC=9.
Solution: Let BC=x, From the given figure and the given information, it can be seen that △ABC is similar to ΔBDC by AA rule, thus using the proportionality theorem, we get
⇒
⇒
⇒
⇒BC=12
Now, calculate the similarity scale,
k=
=
Therefore,
⇒
⇒