Element X decays radioactively with a half life of 9 minutes.
. If there are 960 grams of
Element X, how long, to the nearest tenth of a minute, would it take the element to
decay to 40 grams?
y = a(.5)

10% of increase is the final answer! : )

step-by-step explanation:

answer: first option i.e. 'a' is correct.

step-by-step explanation:

since we have given that

number of minutes to wrap a small gift box = 4 minutes

we need to find the number of gifts to be wrapped in 5 minutes

since there is a direct variation, as the number of minutes will increase with   number of gifts to be wrapped.

so, let the number of gifts to be wrapped in 5 minutes be x.

so, it becomes,

hence, first option 'a'   is correct.