Pls answer and explain

D is the answer

Step-by-step explanation:

for function a

Domain {0, 1, 2, 3, 4}

Range {-4, -1, 2, 5, 8}

So the Domain is alreal numbers

for function B

y=7 is a straight line with zero slope and y-intercept 7 as shown below. Hence its domain (all allowed x-values) is all real numbers, and its range (all allowed y-values) is only 7

So both function A and B have all real numbers as their Domain

D

Step-by-step explanation:

To find the percent mark up, find the amount of the mark up first:

From  $ 21 ,  450  →  $ 27 , 950  is an increase of  $ 6 , 500  To find the percent mark up:change  original amount  × 100  % 6500  21450  ×  100 %  =  30.3 %  mark up in price.