First Answer will get brainliest! 20 points available.

The roots of the quadratic $x^2+8x+4$ are the same as the roots of the quadratic $Ax^2+Bx+1$. What is $A+B$?

Which of the following is the result of expanding

Interpret the following expression (5y^2-7)^3/(2y)^2

The path traveled by a bottlenose dolphin as it jumps out of water is modeled by the equation y=-0.4+3x, where t is the height above water and x is the horizontal distance in feet. if a beam of light is shone upward at an angle modeled by the equation x+y=10, at what height from the waters surface will the beam of light hit the dolphin