Im pretty sure is teh 3rd one
I think that’s a brand of tape beacuse there’s duck tape, scotch tape, paint tape, washie tape etc
Hope this helps:)
The x becomes negative because the negative sign at the start of the parenthesis distributes to everything inside parenthesis so x becomes -x and the double negative becomes +6 so that is why
22.8 grams of element will be remaining after 7 minutes
Further explanation:
Given

The element reduces (1-22%) in one minute.
The process will be repeated 7 times for 7 minutes
If we have to calculate the amount of element after 7 minutes
then the total reduction will be: (1-22%)^7

22.8 grams of element will be remaining after 7 minutes
Keywords: Decay, Percentage
Learn more about percentage at:
#LearnwithBrainly
Answer:
28-11=17
28=100%
17=x
17×100/28=60,71
rounded 61%
60,71%
11/28*100=a
a-100=60,71
to nearest percent 61 i think