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3 years ago

14

I need help with this question please.

1 answer:

kicyunya [14]3 years ago

3 0

It switch to the buzzer app so is 8 + 2 equals what I could be 8 x 2 equals what times that equals what

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Jen solved the equation to determine the number of questions, x, she answered incorrectly on a test. She began by subtracting 10

fgiga [73]

Answer is Correct. She could have also subtracted 100 from both sides, then divided by .

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3 years ago

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Pleaseeee help #10 Which table below describes a linear function?

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Answer:a

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3 years ago

There is a closed carton of eggs in Mai's refrigerator. The carton

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e<12 means there are less than 12 eggs,

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1,2,3,4,5,6,7,8,9,10,11.

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2 years ago

B) Wendy and Xavier share money in the

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22.5

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3 years ago

1. Find the sum of the series (IMAGE) . Show your work.

pav-90 [236]

<u>QUESTION 1 ANSWER</u>

The series is

$\sum_{n=1}^{15}{ (2n-1)}$

So the nth term of this sequence is

$U_n=2n-1$

We generate some few terms of the sequence as follows:

When $n=1$ ,

The first term of the sequence becomes,

$U_1=2(1)-1$

$U_1=1$

When $n=2$ ,

$U_2=2(2)-1$

$U_2=3$

When $n=3$ ,

$U_2=2(3)-1$

$U_2=5$

The constant difference is $d=2$ .

The sum of the series is given by,

$S_n=\frac{n}{2}(2a+(n-1)d)$

There are 15 terms in the series, therefore $n=15$

$S_{15}=\frac{15}{2}(2(1)+(15-1)2)$

$S_{15}=\frac{15}{2}(2+14(2))$

$S_{15}=\frac{15}{2}(30)$

$S_{15}=15\times 15$

$S_{15}=225$

<u>ANSWER TO QUESTION 2</u>

The bottom row has $23$ boxes. This means $a=U_1=23$

a) Since each row has 3 fewer boxes $d=-3$ .

The nth row is given by,

$U_n=23+(n-1)\times(-3)$

$U_n=23+-3n+3$

$U_n=23-3n$

The top row is the 6th row, meaning $n=6$ .

$U_6=23-3(6)$

$U_6=23-18$

$U_6=5$

b) The number of boxes in the entire display is given by

$S_n=\frac{n}{2} (a+l)$

Where $a=23$ , the first term(row) and $l=5$ , the last term(row).

Since there are 6 rows,

$S_6=\frac{6}{2} (23+5)$

$S_6=3 (28)$

$S_6=84$

<u>ANSWER TO QUESTION 3</u>

The number of visitors in the first week is $a=5$ .

Since the number of visitors each week is doubled the number of visitors in the subsequent weeks, the sequence is a geometric progression with a common ratio of $r=2$ .

The general term of a geometric sequence is

$U_n=ar^{n-1}$

So in the 8th week, we have

$U_8=5\times 2^{8-1}$

$U_8=5\times 2^{7}$

$U_8=5\times 128$

$U_8=640$

Hence 640 people visited the website in the 8th week

4 0

3 years ago