Homework Help: algebra

Posted by lily on Monday, May 17, 2010 at 3:49pm.

each week, mandy's algebra teacher gives a 10 point math quiz. after 5 weeks, mandy has earned a total of 36 points for an average of 7.2 points per quiz. she would like to raise her average to 9 points. on how many quizzes must she score 10 points in order to reach her goal?

algebra - sara, Monday, May 17, 2010 at 4:00pm
guess and check is the best way!

total is 5 quizzes and she has 36 points so 7.2*5 (weeks) = 36 and add 10 to 36, 14 times so just add 140 and you get 176/19(#number of weeks 14+5) and you get 9.2 as the average. hope this is what you were looking for. sorry if its not

Answer this Question

Related Questions

math - distance from A-B is 40 km.Mandy starts from A at 11 am and Jason starts ...
Algebra - I have 2 questions in math that I am not quite sure about... 1. Mandy ...
Algebra - I have 2 questions in math that I am not quite sure about... 1. Mandy ...
math B-logarithms - im having a quiz on this tom and i dont understand it at all...
math - Tyrone has $60 and his sister has $135. Both get an allowance of $5 each ...
pre-algebra 3 - One week you earned $1350. Let s represent your total sales that...
math - 22. The graph shows the number of handbags that Mandy made in one day. ...
algebra - Sarina started depositing money in savings account. after 10 weeks she...
Algebra - how do you solve linear combinations?
math - Over the past two weeks, Jane earned $292 and $193 respectively, at her ...

For Further Reading

First Name:
School Subject:
Answer: