The ph scale measures how acidic or basic a substance is. normal drinking water needs to have a ph of less than 8.5 and greater than 6.5. model the normal range of ph values of water, using a compound inequality.
a. 6.5 < x < 8.5
b. 6.5 > x > 8.5
c. 6.5 ≤ x ≤ 8.5
d. 6.5 ≥ x ≥ 8.5

Which situation could best be represented by this linear equation? 24x + 38y = 520 > if x represents the number of bracelets and y represents the number of rings, there were 24 more bracelets sold than rings. the total sales were $520. if x represents the number of bracelets and y represents the number of rings, there were 38 more bracelets sold than rings. the total sales were $520. if x represents the number of bracelets sold at $24 each and y represents the number of rings sold at $38 each, the total sales were $520 if x represents the number of bracelets and y represents the number of rings, there were 520 bracelets and rings sold. bracelets were $24, and rings were $38. e