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f(x)=-x²-8x-12

take derivitive

f'(x)=-2x-8

zero at x=-4

in x<-4, the derivitive is positive so the function is increasing

in x>-4, the derivitive is negative so the function is decreasing

increasing in (-infinity,-4)

decreasing in (-4,infinity)

first option

**Answer:**

12 inches of fabric

**Step-by-step explanation:**

Area of a triangle = hight x base

so 6 x 2 = 12

12 inches of fabric is your answer

Hope this helps :)

**Answer:**

**Concept****:**** ****Mathematical**** ****Analysis**** **

- The full rotation of a pendulum is attached, plug in the values and solve.
- Rate brainlist.

The <em>**correct answer**</em> is:

f(x) = -10x², f(x) = 2x², and f(x) = 0.5x²

**Explanation**:

For a quadratic in standard form, f(x) = ax²+bx+c, the value of a describes the width and direction of the parabola. If a is positive, the parabola is open upward. If a is negative, the parabola is open downward.

If a < 1, a fraction or decimal, the graph is wider than the parent function f(x)=x². If a > 1, the graph is narrower than the parent function f(x)=x². The larger the value of a is (a > 1), the narrower the graph is. This makes the function with the decimal value of a the widest; the remaining graphs are in order of the value of a, least to greatest.