I believe B and C are the answers. I’m sry if I’m wrong but I’m probably right.
U didn’t say the speed but a hummingbird can flap it’s wing 80 times per second
<h3>
Answer: 2x+21</h3>
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Work Shown:
f(x) - g(x) = [ f(x) ] - [ g(x) ]
f(x) - g(x) = [ 7x+15 ] - [ 5x-6 ]
f(x) - g(x) = 7x+15 - 5x+6
f(x) - g(x) = (7x-5x)+(15+6)
f(x) - g(x) = 2x+21
Answer: The distance around the lot is given by

Step-by-step explanation:
Since we have given that
Length of rectangular lot is given by

Width of rectangular lot is given by

We need to find the distance around the lot.
As we know the formula for "Perimeter of rectangle":

Hence, the distance around the lot is given by

For the answer to the question above, it is 0.79 divided by 3.95 is 5 so she bought 5lbs. So the answer to the question above is 5.
I hope my answer helped you in your problem. Feel free to ask. Have a nice day!