ANSWER
The 4th term is -27
EXPLANATION
The sum of the first n-terms of an arithmetic sequence is

It was given that,








The n-term is given by:

We substitute n=4 to get,




Answer:
2.5 miles per minute
Step-by-step explanation:
speed = distance ÷ time
speed = s
distance = 25 miles
time = 10 minutes
s = 25÷10
s = 2.5 miles per minute
1 and negative 1. Any number plus the opposite (negative) version of itself works. Hope this helped, could I possibly get brainliest?
Answer:
See explanation below to use the vertex form to solve a quadratic equation.
Step-by-step explanation:
(x - h)^2 - k = 0, the vertex is (h, -k)
An example below, taking a quadratic equation and completing the square:
x^2 - 2x - 1 = 0
x^2 - 2x = 1
(-2/-2)^2 = 1, add 1 to both sides of the equation.
x^2 - 2x + 1 = 1 + 1
(x - 1)^2 = 2
(x - 1)^2 - 2 = 0
The vertex is (1, -2)
Answer:
Approximately 83 degrees
Step-by-step explanation:
Consider the curve

Let us find equation of tangent or slope of tangent at (1,2)
Differentiate y wrt x

slope of tangent = value of derivative at that point
So slope of tangent at (1,2) = 
Slope of a line is nothing but tangent of the angle it makes with positive x axis
So if phi is the angle
we have

Approximately 83 degrees