The annual interest rate is 6.2%.
Solution:
Given data:
Interest = $310
Principle = $1000
Time = 5 years
To find the annual interest rate:
<u>Simple Interest formula:</u>
Substitute the given values in the formula, we get
Do cross multiplication.
Divide both sides of the equation by 1000, we get
Divide by 5 on both sides of the equation, we get
R = 6.2%
Hence the annual interest rate is 6.2%.
Answer:
Option A. x < -4
Step-by-step explanation:
The given function is f(x) = -(x + 6)(x + 2)
General form of the function will be,
f(x) = -(x² + 2x + 6x + 12)
= -(x² + 8x + 12)
Vertex form of the function will be,
f(x) = -[x² + 2(4)x + 12]
= -[(x² + 2(4)x + 16) - 16 + 12]
= -(x + 4)² + 4
Therefore, parabola for the function above will open down with vertex (-4, 4) as shown in the graph attached.
Graph shows the function is increasing in x < -4 and decreasing in x > -4.
Therefore, Option A. is the correct answer.
