ElectricPavlov

A quick Venn diagram sketch:

https://web2.0calc.com/questions/on-18-of-her-calls-there-is-no-answer-or-the-line#r1

1)   Pentagon has interior angles that sum to   (n-2)*180 = 540      take it from here

2)    area of a square = l * w    but l and w are equal

     so area =   l^2

         18 = l^2      then you can find 'l' 

                                  diagonal is Pythag theorem     diagonal = l^2 + l^2         Take it from here

3.) Opposite angles in an inscribed quad are supplementary (add to 180 )    Take it from here

(1+-7)   +  (3i-15i)

   -6     - 12i

I won't tell you which ones....but I WILL tell you how to figure which ones are

Pyhtagorean theorem says   hypotenuse²  = leg1²  + leg2²

    hypotenuse will big the longest of the three measures

Example :    First one

     does     34²  =  16²  + 30²         I do not know....but if it does...it is a Pythag triple !

                                                           Now....YOU have to do that for all of the choices !     Tedious....but it makes it memorable

5 entrees x 6 sides x 7 drinks =   5 * 6 * 7  choices =...........

P.S.  It WILL seem like you have plateaued if you spend a lot of time on here....it gets quite repetitive !

Well..... Look into physics or engineering .....LOTS of advanced math !    ....and you can be a MATH MAJOR too....

ef = -15      e is negative

eg = 6         g is negative too

fg = -10        f is positive

f = -15/e

g = 6/e

fg then becomes   -15/e  * 6/e = -10         -90/e^2 = -10

                                                                   e^2 = 9     take the negative root (e is negative) = e = - 3 

ef = -15      then f = 5

5 (g) = -10     g = -2

It just comes with time and more courses       algebra    geometry      trigonometry       calculus    physics      advanced apllied math                      diferential equations        number theory    and on

    and lots of college courses (engineering ) use a LOT of math ....then you will really start expanding......  keep at it !