$17.60 is what she started out with. If she ended with $13.50, subtract the $4.70 so you get $8.80. Then you'd divide that by .5 to get 17.60.
The second one because when u calculate the root u get 80 than u have to simplify which gets u 4√5
Answer:
115
Step-by-step explanation:
By interior angle sum postulate of a quadrilateral.

Ok so (3x+50)=(6x-20) take the 6x -3x =3x
then 3x-10=50 add the 10 to 50
giving you 3x=60 dvide 60 by 3
X=20
3 to the 3rd power equals 27 making the answer 1/27