We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive pseudonymised information about your use of our website. cookie policy and privacy policy.

+0

# Check My Answers?

+1
368
1

Hello, I have an answer to this question but my classmates have answered have all had different answers than me. I just want to make sure that I am correct.

Heres the question:

Andrew earns an allowance of \$14 the first week, \$17 the next week, \$20 the following week, and so on.

How much will Andrew earn over the course of 10 weeks?

My answer--\$42

My reasoning--Because the series increases by 3. Sooo 14+3=17+3=20+3=23+3=26 and so on until you add 3 to the number (n) 10 times. Which equals 42.

Am I right?

Apr 15, 2018

### 1+0 Answers

#1
+2

The answer is  given by :

[ First term + Last term] * 10 / 2

The frist term is 14

The last  is  14 + 3(10 -1)  =  14 + 3(9) =  41    ....  so  we have.......

[ 14 + 41 ] * 10 / 2  =

[55 * 10]  / 2  =

\$275   Apr 15, 2018