3x(x-7)
metod de sustitución
If x = 12.5 cm, what is the area of the rectangle?
(1+7)+2= +2
5=7*10^(-3x)
cos(y)=315
root 80 as a surd
solve this in cosine law cosα=0.6875
3-x= - $\frac{4}{x}$
