Yes, for fractions you can multiply the denominator by the numerator. For square roots you can use the square root button.
28 - 18 = 10.
150 x 10 = 1500
So all you've got to do is..
150 x 1500 = ???
You can do the rest lol
A solution can be found using substitution by substituting the ordered pair into both of the original equations.
The rectangle with maximum area will actually be a square.
Each side will be of length 7/4 = 1 3/4.
The graph looks like this, on the enclosed pic:
One feature is that it's periodic and torn (has cut-off points), meaning the domain is the same as in case of tan(x): x€R and x =/= π/2+πn.
The range equals the range of arcsin(x): -π/2<=y<=π/2 OR y€[-π/2;π/2]
Hope could understand and if it helped! :)