The graph of the line y=4 is a

a) vertical line with a slope of zero.

b) horizontal line with a slope of zero.

c) vertical line with an undefined slope.

d) horizontal line with an undefined slope.

B) Horizontal line with a slope of zero.  

Step-by-step explanation:

If y = 4, it never changes.  

Slope = Δy/Δx, but Δy = 0, so slope = 0.

A is wrong. A vertical line has an undefined slope.

C is wrong because the line is horizontal.

D is wrong because a horizontal line has a zero slope.

The diagram shows that the graph of y=4 is a horizontal line with a slope of zero.

the total estimated nappy use.=10,500,000

step-by-step explanation:

given that on an average the average baby uses 3528 napkins.

in a particular year 2014, the number of births were 299697 in new south wales.

rounding off the number of births to the nearest hundred thousand we have

no of birtsh = 300000

also rounding off the average usage to nearst thousand we get

average use of a baby = 3500

hence total number of nappy estimated to be used = 3500x300000

= 10,500,000

answer is 10,500,000 nappies