Mr. D'Alton made some radium in his lab. He used 2/5kg of the radium every time he ran his experiment. If he did the experiment four times and had 2 1/3 kg left, how much radium did Mr. D'Alton make at first?​

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!

no solution

step-by-step explanation:

there is not enough information in the problem to solve.