Answer:
z = 7.5
Step-by-step explanation:
Given that z is directly proportional to x and inversely proportional to y then the equation relating them is
z = ← k is the constant of proportionality
To find k use the condition when x = 16, y = 5, z = 16, then
k = = = 5
z = ← equation of proportionality
When x = 21, y = 14, then
z = = 7.5
8y²-5y+7 from 2y²+7y+11
2y²+7y+11-(8y²-5y+7)
2y²+7y+11-8y²+5y-7
-6y²+12y+4
72
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