Answer:
-4.51500
Step-by-step explanation:
-4.515
Assuming the "x" is multiplication, 5.8-7.09=-1.29, then 3.5*(-1.29)=-4.515
It will take her an hour and a hlaf
4ab
(a+b)^2-(a-b)^2
=a^2 + 2ab + b^2 -(a^2 - 2ab +b^2)
=a^2 + 2ab + b^2 - a^2 + 2ab - b^2
=2ab + 2ab
=4ab
