The answer is 7x+77
( X5 ) x ( X6 ) = X(5+6) = X11
I do not think that quanties can be multiplied or divided. Any two quantities can be multiplied together. Any quantity can be divided by any non-zero quantity.
1
Pressure
Pressure
a quantity multiplied by itself
Pressure
652 multiplied by seven is 4,564
To install X11 on a Mac you could try Fink. Apple has information about X11 on their Developers section. (See links below)
One.
31 multiplied by 7 is 217
exponent (or power).