Hi there!

f(x) = 2x + 6
Differentiating 2x = 2 (Power rule, dy/dx xⁿ = nxⁿ⁻¹)
Differentiating a constant always equals 0.
Thus:
f'(x) = 2
According to my calculation it should be C: x= 1 and y = - 4
NOTE: I had it right on my online class.
Answer:
kikjj
Step-by-step explanation:
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For 80 guests you will need 80/10 = 8 times more than for 10 guests:
8*9.50 = $76
Refreshment for 80 guests costs $76.
X=14
Y=15
Im assuming you want to find out what x and y are