0
Find the sum of first 25 terms of an AP whose nth term is given by Tn equals 7 -3n?
The general expression for the nth term of an AP is : a + (n - 1)d, where a is the first term and d is the common difference.
Putting n = 1, then T1 = 7 - 3 = 4, which is the value of a.
Then 7 - 3n = 4 + (n - 1)d : 3 - 3n = (n - 1)d : -3(n - 1) = (n - 1) d : d = -3.
The formula for the sum of the AP to the nth term is : Sn = n/2[2a + (n - 1)d]
Therefore S25 = 25/2[2x4 + (25-1)x-3] = 25/2[8+(24 x -3)] = 25/2[8-72] = 25/2 x - 64 = -800
What else can I help you with?
What are facts about like terms?
terms whose variables are the same.
What is the first ten terms of a sequence whose first term is -10 and whose common difference is -2?
-8
Find the slope of the line whose equation is 17 plus 3y 7x.?
Without an equality sign the given terms can't be considered to be a straight line equation.
How do you find the radius of the circle with the given equation of x2 plus y2-10x plus 4y plus 4 equals 0?
Given: x2 + y2 - 10x + 4y + 4 = 0 First, we'll move our constants to the right: x2 + y2 - 10x + 4y = -4 Then group terms with the same variables together: x2 - 10x + y2 + 4y = -4 Then complete the squares: x2 - 10x + 25 + y2 + 4y + 4 = -4 + 25 + 4 (x - 5)2 + (y + 2)2 = 25 And there we have it. This is an equation for a circle whose center point is at (5, -2), with a radius of √25, which equals 5.
What is the sphericity for a cylinder whose length equals to diameter?
1
What are the first ten terms of a sequence whose first term is -10 and whose common difference is -2.?
-8
What are the first 5 terms in the sequence whose nth term is given by 5n 2?
5n+2 or 5n-2. I'll assume 10n 10,20,30,40,50
What is a pair of numbers whose product equals a given whole number?
That's a factor pair.
What are the first five terms of the sequence whose nth term is N4 plus 225?
2,1,0 is th sequence of its terms
What points are on the line given by the equation y equals 2x?
All points whose y-coordinate is twice its x-coordinate.
What are facts about like terms?
terms whose variables are the same.
What pair of pont both lie on the line whose equations is 3x-y equals 2?
No pairs of points are given so the question cannot be understood
What is the set of points in a space that are a given distance from a given point?
They form the sphere whose center is the given point and whose radius is the given distance.
What is the first ten terms of a sequence whose first term is -10 and whose common difference is -2?
-8
What is the first given name of the NBA player whose nickname is Penny?
Anfernee "Penny" Deon Hardaway.
Find the slope of the line whose equation is 4x - 6y 8?
Without an equality sign the given terms can't be considered to be a straight line equation.
Terms whose variables and their expoents are the same?
They are called like terms
