Answer:

Step-by-step explanation:
See photo for steps.
(3n-10p)^2
=(3n-10p)(3n-10p)
=9n^2-10p-10p+100p^2
=9n^2-20p+100p^2
Y=3.1x+400 The x is how much it grows per week and the 400 is where it started at. the y is how tall it is after x weeks
B=1/2
9/16=1/2b(3/4)
Divide both sides by 3/4
1/4=1\2b
Multiply both sides by 2