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3 years ago

Meredith wants to save up for a new bike that costs $400 and she gets $20 per week. How many weeks will it take her to get $400

Mathematics

1 answer:

stepan [7]3 years ago

7 0

She’ll have 1000 and something

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10. An arithmetic sequence has this recursive formula. What is the explicit formula?

Mrrafil [7]

Answer:

$a_{n}=45-3n$

Step-by-step explanation:

Method 1:

Arithmetic sequence is in the form

$a_{n} =a_{1} +(n-1)d\\$

d is the common difference, can be found by:

$d=a_{n}-a_{n-1}=-3$

Subtituting the $a_{1}$ and $d$

You get:

$a_{n}=42+(-3)(n-1)=45-3n$

Method 2 (Mathematical induction):

Assume it is in form $a_{n}=45-3n$

Base step: $a_{1} =45-3(1)=42$

Inducive hypophesis: $a_{n}=45-3n$

GIven: $a_{n+1} =a_{n}-3$

$a_{n+1}=45-3n-3=45-3(n+1)$

Proved by mathematical induction

$a_{n}=45-3n$

5 0

3 years ago

Charlie used these steps to solve the equation 6x+5=1+2(3x+2)6x+5=1+23x+2. Which choice describes the meaning of his result, 5

zaharov [31]

We have that
[6x+5]=1+2*(3x+2)
[6x+5]=1+2*3x+2 --------> is not correct ------->1+ 2*(3x+2)=1+2*3x+2*2

then
[6x+5]=1+6x+4---------------> [6x+5]=[6x+5]

this equation is an identity, all real numbers are solutions.

5 0

3 years ago

Read 2 more answers

Type the correct answer in each box. The length of a rectangle is 2 inches more than its width. The perimeter of the rectangle i

vekshin1

Answer:

5 is the width and 7 is the length

4 0

3 years ago

Read 2 more answers

i need help here are three monomials such that the greatest common factor of the first and second monomials is 2xy, and the grea

hjlf

I think it's 3 don't take my hit on it

6 0

3 years ago

What is meant by the term outlier? What should you do with an outlier?

saul85 [17]

Outliers are data that are in a very far distance from other values in a set of data

Once an outlier is detected in a set of data, we can do the following to them:

Discard the outlier
Change the value of the outlier with another value within close range
Consider the distribution given

We may have a set of data where some of the values are far in distance from the majority of the data. The set of such data are known as an outlier.

For example, give the set of data;

2, 4, 7, 45, 8

45 can be considered as an outlier since the distance of data to all other data is large.

Once an outlier is detected in a set of data, we can do the following to them:

Discard the outlier
Change the value of the outlier with another value within close range
Consider the distribution given

Learn more here: brainly.com/question/23258173

7 0

3 years ago