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musickatia [10]
3 years ago
15

WILL mark branliest answer if gotten right

Mathematics
1 answer:
Jet001 [13]3 years ago
5 0
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Find the sum of the first 11 terms of the sequence -7,-4,-1, 2 ...
lawyer [7]

Answer:

A    The sum of the first 11 terms is 88

Step-by-step explanation:

Since -4 - (-7) = -1 - (-4) = 2 - (-1) = 3

Your sequence is an arithmetic sequence with a common difference of 3.

The formula for the sum of an arithmetic sequence is

S = \frac{n(a_{1} + a_{n}) }{2}  where a_{1} = the first term, a_{n}  =  the  last  term, n = the  number  of  terms  to  be  added, and S = the  sum

In your case a_{1}  = -7,  n = 11  and a_{n}  =  a_{11}

We know everything except the eleventh term.

So, we need to find the eleventh term or  a_{11} = a_{1} + (n - 1)d

                                                                     =  -7 + (11 - 1)3

                                                                     = -7 + 30 = 23

Now, S = \frac{11(-7 + 23)}{2}  = \frac{11(16)}{2}  = 88

The sum of the first 11 terms is 88

7 0
3 years ago
Which number sentence is true?
Serggg [28]

Answer: the answer choice “d” is correct

Step-by-step explanation:

because the different symbols mean different things and yeah

8 0
3 years ago
Read 2 more answers
What is the greatest common factor between 18 and 24?
klemol [59]

Answer: 6.

We found the factors and prime factorization of 18 and 24. The biggest common factor number is the GCF number.

4 0
4 years ago
Read 2 more answers
(3, 2), y = x + 5 Write an equation in slope-intercept form for the line that passes through the given point and is parallel to
astraxan [27]

Answer:

y = x - 1

Step-by-step explanation:

Since the line is parallel to y = x + 5, it will have the same slope, which is 1.

Plug in the slope and the given point into y = mx + b, and solve for b:

y = mx + b

2 = 1(3) + b

2 = 3 + b

-1 = b

Then, plug in the slope and b into the equation:

y = mx + b

y = x - 1

So, the equation is y = x - 1

7 0
3 years ago
[HELP] Are the diagonals of an isosceles trapezoid congruent?
erastovalidia [21]
Yes.

the properties of an isosceles trapezoid are:
- the bases are parallel 
- opposite sides are congruent
- the angles on either side of the bases are congruent
- the diagonals are congruent
3 0
3 years ago
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