Solve.
-5x^2+9+7x = 0−5x
2
+9+7x=0

x =, or x=2.21327 and -0.81327

Step-by-step explanation:

see if equation is factor-able:

the two ? must multiply together to and add up to 7x

no two integers times x can solve, so we must use quadratic equation

, given a quadratic

so

answer:   28.56 feet (approx)

step-by-step explanation:

since, triangle abc has measure of angle c equal to 55 degrees, measure of angle abc equal to 90 degrees, and length of bc equal to 20 feet.

we have to find out the measurement of segment ab.

therefore, tan 55° =

but bc = 20 feet.

⇒ tan 55 ° =  

⇒ ab = 20 × tan 55 °

⇒ ab = 20 × 1.42814800674

⇒ ab = 28.5629601348   ≈ 28.56 feet

answer: (3,11) is your answer.