Step-by-step explanation:
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Hello :
-5x^2-2x^3-4x =-2x^3-5x^2-4x.....(<span> standard form.)
</span><span>the number of terms are : -2 , -5 , -4 ,0</span>
Answer:

Step-by-step explanation:

Add 5
5,10,15,20,25,30....
18a+15
making a subject of formular
a=18-15
=3