Answer: B
Step-by-step explanation:
We can rearrange the equation to get
, which clearly has complex roots.
We need to find time taken to reach arrow to its maximum.
The path of the arrow can be modeled with the equation
.
Differentiating the given equation w.r.t x and equate it to zero.

Putting value of x = 21 sec in given equation, we get :

Therefore, time taken to reach maximum height is 21 seconds.
Answer:
888300 people.
Step by step explanation:
We have been given that 32.9% of the 2,700,000 Chicago residents identified themselves as Black or African American in the 2010 census.
Let us find 32.9% of 2,700,000.



Therefore, 888300 people in the 2010 census are African American.
Answer: 90
Step-by-step explanation:
Answer:
A kite with a 100 foot-long string is caught in a tree. When the full length of the string is stretched in a straight line to the ground, it touches the ground a distance of 30 feet from the bottom of the tree. Find the measure of the angle between the kite string and the ground.
17°
27°
63°
73°
Step-by-step explanation: