What is the simplified form of the following expression?

Step-by-step explanation:

To simplify, multiply the coefficients of the terms and add the exponents of the same variable together. So, multiply 2 and -2 together, and add the exponents 7 and 9 together while keeping the variable of x:  

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Thus, the answer is .

Set it up as a ratio:

16 ounces feeds 80, 12 ounces feeds X

16 / 80 = 12 / X

Cross multiply:

16X = 80*12

16X = 960

Divide both sides by 16:

X = 960 / 16

X = 60

12 ounce feeder will feed 60 hummingbirds.