A book store is having. 30% off sale. Diary of a wimpy kid is now on sale for 6.30$ how much was it originally

$8.19

Step-by-step explanation:

First start by taking 30% of 6.30. To do this you multiply 6.30 by .3 and get: 6.30 × .3 = 1.89

Then add 1.89 to the 6.30 because the book was 30% more. You then get: 6.30 + 1.89 = 8.19

i think it's ф or x=6,-6

step-by-step explanation:

-x^2=-36

x^2=-36

ф

or

if you mean by : -(x^2)=-36

it'll be: x^2=36

x=6,x=-6

hope it'll ! have a good day!

you for asking!