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ASHA 777 [7]
3 years ago
9

The first and last terms of a 10-term arithmetic series are listed in the table. What is the sum of the series?

Mathematics
2 answers:
JulsSmile [24]3 years ago
8 0

Answer:

b. 390

Step-by-step explanation:

a_1 =3\\a_n=75\\n=10\\\\use \ the \ arithmetic\  formula \\\\S_n=\frac{n}{2}(a_1+a_n)\\S_1_0=\frac{10}{2} (3+75)\\\\ \\S_1_0= 5 (78)\\\\S_1_0=390\\

USPshnik [31]3 years ago
3 0
The arithmetic sequence general formula is an = a1 + d *(n-1) where d is the arithmetic difference and n is an integer. In this case, upon derivation, the formula that represents the sum of the series is S = (a1  + an)*(n/2). Substituting, S = (3+75)*(10/2) equal to 390
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Out of 4,000 colleges surveyed, 60% reported that SAT scores were not used as a high consideration in viewing their applications
Oduvanchick [21]

Answer:

Hi.  

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8 0
3 years ago
In this subtraction, PR5T and 47Y6 represent 4-digit numbers. What number does PR5T represent?
Svetach [21]

Answer:

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R = 7

T = 4

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Step-by-step explanation:

Let us try to understand the subtraction starting from the unit's digit.

   P R 5 T

-  4 7 Y 6

-----------------

    1 9 9 8

To get 8, 6 should be subtracted from 14

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So, T should be equal unit digit of 14 <em>i.e.</em> T = 4 and 1 should be carried over from the ten's digit of PR5T.

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-----------------

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5 0
3 years ago
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Slav-nsk [51]

Answer:

Step-by-step explanation:

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40x4=160    +

----------------

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Hope this helps

And don't forget to mark as brainliest

5 0
3 years ago
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