91Ó°ÊÓ

Problem 43

\(2 w^{2}+4=-18\)

Problem 45

\(x^{2}+4 x+8=0\)

Problem 48

\(p^{2}+14 p+53=0\)

Problem 54

\(y=x^{2}-16\)

Problem 55

\(b^{2}-6 b-16=0\)

Problem 55

\((x-9)^{2}=100\)

Problem 60

\(k^{2}+6 k+5=0\)

Problem 63

\(y=x^{2}-10 x+29\)

Problem 66

\(c^{2}+7 c=0\)

Problem 68

The height of a tower is \(80 \mathrm{ft}\). A guy wire is anchored at a distance from the base that is equal to \(80 \%\) of the height of the tower. The other end of this guy wire is connected to the tower \(20 \mathrm{ft}\) below its top. Find the length of this guy wire. Round to the nearest whole number.