Respuesta :

niti1409
so first you will substitute p for 15
so your equation will look like d=3(15)^2+168(15)-315
then you will simplify
to get d= 2025+2520-315
simplify again 
to get d=4230

 
apologiabiology
sub
-3(15^2)+168(15)-315=
-3(225)+2520-315=
-675+2205=
1530

d=1530 when p=15

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