Answer:
D
Step-by-step explanation:
Roots into factors:
x = -4 ----> (x + 4)
x = i -----> (x - i)
x = 5 -----> (x - 5)
(x + i)(x - 4)(x + 5)
(x - i)(x² - 4x + 5x - 20)
(x - i)(x² + x - 20)
x³ + x² - 20x - (ix² + ix - 20i)
x³ + (1 - i)x² - (20 + i)x + 20i
Answer:
If you are asking what 2 divided 2 is its 1
Step-by-step explanation:
Answer:

Step-by-step explanation:
Calculate for the value of
:

-Use <u>Distributive Property</u> on both left and right:


-Take
and subtract
:


-Add
to both sides:


-Take
and divide on both sides:


Therefore, the value of
is
.
Answer:
5.5 minutes
Step-by-step explanation:
Fill in the given information and solve for t.
75 = -15cos(2πt/15) +65
-10/15 = cos(2πt/15)
t = 15/(2π)arccos(-2/3) ≈ 5.492
The volume reaches 75 dB about 5.5 minutes after the truck arrives.