Question

millie needs the average height of the plants she is buying to be at least 73 inches. she has selected three plants that are 70, 71, and 72 inches tall. Right and solve an inequality that Millie could use to determine the possible heights of her fourth plant

Answer 1

 (70+71+72+x)/4 ≥ 73

 (213+x)/4 ≥ 73
 
 213+x ≥ 73*4
 
 213+x ≥ 292
-213      -213
 
 x ≥79

Check: 
(70+71+72+80)/4 

292/4

73.25

Your Answer:
x ≥ 79