Answer:
Option C is correct.
Step-by-step explanation:
y = x^2+4x+5
We need to find the vertex of the above equation.
The above equation represents the parabola.
The slope of parabola can be found by taking derivative of the given equation
dy/dx = 2x+4
The slope of the parabola at the vertex is zero SO,
2x+4 = 0
2x = -4
x = -4/2
x = -2
Putting value of x =-2 to find the value of y
y = x^2+4x+5
y =(-2)^2+4(-2)+5
y = 4-8+5
y =9-8
y = 1
So, the vertex is (-2,1)
Option C is correct.
Answer:

Step-by-step explanation:
Given:
Number of questions (N) = 16
Number of easy questions (E) = 8
Number of medium-hard questions (M) = 5
Number of hard questions (H) = 3
Now, the probability of getting the first question as easy question is given as:

Now, probability of getting the second question as easy question is given as:

Now, probability that the first two contestants will get easy questions is given by the product of
. So,

Therefore, the probability that the first two contestants will get easy questions is 
Answer:
2x-15 < or = -23
Step-by-step explanation:
Let x be the number.
Twice that number is 2x. 15 less than that is -15.
2x-15 < or = -23
Answer:
30 degrees
Step-by-step explanation:
first find the angle of the other angle that is not found
180-100=80 degrees
since all angles of triangle add up to 180 degrees..
180-80-70= 30 degrees