Question

Pwease help me anyone. thanks :-) :-) :-) :-) :-) :-) :-) :-)!!!!

Answer 1

A)
$x+3$

b)
$x(x+3)=340\\ x^2+3x-340=0$

c)
$x(x+3)=340\\ x^2+3x-340=0\\ \Delta=3^2-4\cdot1\cdot(-340)=9+1360=1369\\\sqrt{\Delta}=37\\ x_1=\dfrac{-3-37}{2}=-20\\ x_2=\dfrac{-3+37}{2}=17$

It's 17.