We use the same double angle identity.
Answer:
0.46 per donut. 46 cents
Step-by-step explanation:
5.49/12=0.4575
Rounding to the nearest cent is about 46 cents per donut.
2
-1, -2
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The answer is (5x - 3)(x + 2)
x = 1
Step-by-step explanation:
Given data: 
Recall: If f(x) = 0, then x is called the zero of the function.
To find zero of the function, take f(x) = 0.

Add 6 to both sides of the equation.

Divide both sides of the equation by 3.

Taking square on both sides of the equation.
⇒ x + 3 = 4
⇒ x = 1
Hence, the zero of the function is 1.