Evaluate the integral by making an appropriate change of variables. Round your answer to two decimal places. 
R is the parallelogram bounded by the lines 
.
Definitions:
Retrograde Pyelography
A diagnostic imaging test where dye is injected into the bladder and travels up the ureters to the kidneys, used to detect abnormalities.
Specific Gravity
A measure of the density of a substance compared to the density of water.
Urine
A liquid waste product filtered from the blood by the kidneys, excreted through the urethra.
High-Frequency Sound Waves
Sound waves that have a frequency higher than the upper limit of human hearing, used in applications like ultrasound imaging.
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