Answer:A
Step-by-step explanation:
Answer:
$80
Step-by-step explanation:
It's khan so you don't need the explanation but for those interested then here:
K=30x+20 - Kayla
S=35x+10 - Sara
60+20=80
70+10=80
So they match up at $80
Set the equation to 0. new equation would be y^2/36 - x^2/121 = 0
factor the new equation: (y/6 + x/11)(y/6 - x/11) = 0
y/6 + x/11 = 0 —> y = -6x/11
y/6 - x/11 = 0 —> y = 6x/11
the asymptotes would be y = -6x/11, y = 6x/11
The entire system forms a right angle triangle.
Let the height of the bulding be x, then tan 45 = (x - 6)/60
60 = x - 6
x = 60 + 6 = 66
Therefore the height of the building is 66 feet.
