SOLUTION: http://gyazo.com/dfc205142f7d353e8548df1b4bafb372 Really need help :(

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Question 896813: http://gyazo.com/dfc205142f7d353e8548df1b4bafb372
Really need help :(
Found 2 solutions by josgarithmetic, ankor@dixie-net.com:
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
v=7sqrt%28p%29.
v=42
-
Solve for p.
Evaluate according to the given datum.

Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
Your problem v+=+7sqrt%28p%29, find p when v = 42,
write it:
7sqrt%28p%29+=+42
square both sides and you have
49p = 1764
p = 1764/49
p = 36 psi