Question 897462
The product of two numbers is 63. One of the numbers is T What is the other number?
<pre>
A {{{63/T}}}
B {{{"63×T"}}}
C {{{T+63}}}
D {{{63-T}}}

Put them all in parentheses 

A {{{(63/T)}}}
B {{{"(63×T)"}}}
C {{{(T+63)}}}
D {{{(63-T)}}}

Now multiply them all by T, and see which one gives us 63.

A {{{T(63/T)}}} 
B {{{"T(63×T)"}}}
C {{{T(T+63)}}}
D {{{T(63-T)}}}

Simplifythem all:

A {{{T(63/T)}}}{{{""=""}}}{{{cross(T)(63/cross(T))}}}{{{""=""}}}{{{63}}} 
B {{{"T(63×T)"}}}{{{""=""}}}{{{63T^2}}}
C {{{T(T+63)}}}{{{""=""}}}{{{T^2+63T}}}
D {{{T(63-T)}}}{{{""=""}}}{{{63T-T^2}}}

Edwin</pre>