Which is a correct step when using the median-fit method for modeling data? Use the median value of y-intercepts found.
Calculate slope using the right and middle points.
Determine three y-intercepts by using each summary point along with the slope.
Determine the median of the x-values and the median of the y-values.

i dont know sorry

step-by-step explanation:

225x²+4=0

225x²=0-4

225x²=-4

x²=-4/225

x=±√-4/225

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.