212.8. I wish this can help you
Your in High School, you should know quadratic formula; start by subtracting 7 from both sides making it 4x^2 - 12x -7, now solve it using the quadratic formula.
Answer: X= 7/2
X= -1/2
Differentiating both sides of PV = C with respect to t gives us ...
... P'V +PV' = 0
Filling in the given numbers gives us ...
... (40 kPa/min)(900 cm³) + V'(150 kPa) = 0
Solving for V' gives ...
... V' = -(40 kPa/min)(900 cm³)/(150 kPa)
.. V' = -240 cm³/min
The volume is decreasing at the rate of 240 cm³/min.
So to get the answer you:
11*9
------ X Sin63 = 44.104 or 44.1
2
Or 11 times 9 divided by 2 times Sin63 equals 44.104 and because it says round to the nearest tenth 44.1
Hope it helps.