3 years ago

-5(−x−1)+4x−1=49 What is X?

1 answer:

3 0

Answer:

The solutions are x=4,x=−10. Explanation: The square root property involves taking the square root of both the terms on either side of the ...

1 answer

Step-by-step explanation:

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In the regular nonagon shown, what is the measure of angle x?<br>A.36<br>B.40<br>C.45<br>D.60

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The answer is 45 i took the test i got it correct

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A car travels 88 miles in 2 hours (with a constant speed). How much time will it take traveling 360 miles?

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A family is trying to pick from different shades of paint for their living room. They have narrowed it down to three different b

slava [35]

The correct answer is 3/9

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The cost of a candy bar in a vending machine is $0.95. The cost of a bottle of water in the same machine is $1.25. Jamie has $25

Mrrafil [7]

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The answer is $16.45

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3 years ago

in a AP the first term is 8,nth term is 33 and sum to first n terms is 123.Find n and common difference

allsm [11]

I believe there is no such AP...

Recursively, this sequence is supposed to be given by

$\begin{cases}a_1=8\\a_k=a_{k-1}+d&\text{for }k>1\end{cases}$

so that

$a_k=a_{k-1}+d=a_{k-2}+2d=\cdots=a_1+(k-1)d$

$a_n=a_1+(n-1)d$

$33=8+(n-1)d$

$21=(n-1)d$

$n$ has to be an integer, which means there are 4 possible cases.

Case 1: $n-1=1$ and $d=21$ . But

$\displaystyle\sum_{k=1}^2(8+21(k-1))=37\neq123$

Case 2: $n-1=21$ and $d=1$ . But

$\displaystyle\sum_{k=1}^{22}(8+1(k-1))=407\neq123$

Case 3: $n-1=3$ and $d=7$ . But

$\displaystyle\sum_{k=1}^4(8+7(k-1))=74\neq123$

Case 4: $n-1=7$ and $d=3$ . But

$\displaystyle\sum_{k=1}^8(8+3(k-1))=148\neq123$

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3 years ago