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3 years ago

What is the sum of the arithmetic sequence 149, 135, 121, …, if there are 28 terms?

1 answer:

andrey2020 [161]3 years ago

3 0

I needed my brother to help me with this one,so here is the answer.
The common difference is -14.

Let's simplify this by expressing each term as 
163 - 14n 
where n is the number of the term. 

Then the sum of the 28 terms is 
28 * 163 - 14 (1+2+3+...+28) 
= 4,564 - 14 * 28 * 29 / 2 
= -1,120

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Step 1 choices:

Julli [10]

You have to translate the triangle over to where point B is lined up with point B in the second triangle. Then you can reflect over the y-axis.
So...your answer should be...
Step 1:A.
Step 2:C.

6 0

2 years ago

Read 2 more answers

Pls help I have no idea what I’m doing

olganol [36]

Answer:

1800

Step-by-step explanation:

61 around to 60 and 29 rounds to 30. so

60 ×30=1800

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2 years ago

Mrs. Daly's reading classes were surveyed about their reading preferences. The data is summarized in the table below.

andriy [413]

Answer:

Required probability is 0.19

Step-by-step explanation:

The two-way table for the given data is,

Fiction Non-Fiction Total

9th grade 35 8 43

10th grade 52 12 64

Total 87 20 107

It is required to find the probability of the students who prefer to read non-fiction novels, given that they are in 9th grade.

That is, to find the conditional probability $P(Non-fiction| 9th\ grade)$ .

Now, $P(A|B)=\dfrac{P(A\bigcap B)}{P(B)}$

So, we get,

$P(Non-fiction| 9th\ grade)=\dfrac{(Non-fiction\bigcap 9th\ grade)}{P(9th\ grade)}\\\\P(Non-fiction| 9th\ grade)=\dfrac{8}{43}\\\\P(Non-fiction| 9th\ grade)=0.19$

<h3>Thus, the required probability is 0.19.</h3>

5 0

2 years ago

PLZ NEED HELP ASAP!!!

madam [21]

Answer:

C and D

Step-by-step explanation:

I had this same problem on my quiz

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2 years ago

PLEASE HELP ME I NEED HELP DESPERATELY!!!!

IceJOKER [234]

I hope this helps, pls tell me if my way of answering is wrong
Answer:
2x-3y=4
x-2y=4

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2 years ago