P = 3t +10square root of t +140, P=400

solve 3t + 10 times the square root of t + 140 using the quadratic formula
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1 Answer

3t +10 root(t) +140=400

3t+10 root(t) -260=0

let x=root(t)...3x^2 +10x -260=0

x=7.7908406 or -11.12417398

t=root(7.79084064)

t=2.791207739
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