Ecuation with word and excel

Last days i've been working doing some ecuation staff in excel and word. 

We used this paragraph in word that is the equation section. There are some that are determinated, like the quadratic equation ones tht is predetermitated.

Also, if the formula that you are looking for is not there you have x's and y's and all the stuff need it to create  new ones.

Here is a picture of the ones we have done:                                                

Here is my word ➡ < 3

We also did an excel, where you just need to put in the numbers and the aplication will solve it for you. 

My excel here ➡ < 3