Unfortunately, the "

**Read Before Posting**" thread, present at the head of so many of the other forums, is missing on this one, so you didn't know better when you flooded the forum with nine or ten questions within minutes, none of them showing any effort. Sorry!

As the article in the link (above) explains, this is not a "we do your homework for you" sort of place. This is a tutoring forum. Legitimate tutors help students learn how to do things for themselves, so one of the primary guidelines here is that the student post a representative exercise (not a flood or the entire assignment), and another is that the student show his/her own effort.

Note: This is not a paid service, so there are no "employees" waiting on stand-by to provide instant solutions. The tutors are volunteers who surf by when they are able. Please be prepared to wait hours, if not days, for any further replies (especially if no work is shown).

Since you have been unable even to attempt any of these exercises, I will guess that you are needing lessons on how to approach these, since you were out sick the week or two that they were covered in class. Unfortunately, we cannot reasonably provide the missing classroom instruction; anything we tried to provide here would be much less complete than your book and the class notes you got from a friend. Fortunately, there are loads of great lessons online, so we can provide you some links.

mrs.wright1976 said:

1) A certain sum of money is invested at 10%. Twice that amount is invested at 8%. The total amount of interest from both investments is $91. How much is invested at 8%.

First study

**percentages**, and then learn how to use them in

**word problems**; you can also study specifically about "

**investment**" word problems.

mrs.wright1976 said:

2) The sum of two numbers is 17 and the sum of their square is 145. Find the larger number

I am assuming that you're familiar with

**variables** and

**solving linear equations**. For this exercise, first learn how to

**translate** the words into math, and then study "

**number**" word problems for specifics.

mrs.wright1976 said:

3) If 6 men can do a piece of work in 14 days, how many men are needed to do the work in 21 days?

There are various ways to approach "

**work**" word problems. Did you have a particular method in mind?

mrs.wright1976 said:

4) The width of a rectangle is 15 feet less than its length, and the perimeter is 210 feet. Find the width

First review the

**geometric formulas**, and then study some specifics of "

**geometric**" word problems.

mrs.wright1976 said:

5) Three times the square of a certain positive number exceeds six times the number by nine. Find the number

This one works just like (2).

mrs.wright1976 said:

6) If a boat goes downstream 72 miles in 3 hours and upstream 60 miles in 6 hours, the rate of the river and the rate of the boat in still water respectively are ________?

Have you studied

**systems of linear equations** yet? (There are at least two different ways to approach this "

**distance**" word problem, and the method used will vary with what your class has covered.)

mrs.wright1976 said:

7) The sum of both digits, of either of two two-digit numbers, in whatever order the digits are written, is 9. The square of either of the digits of either number, minus the product of both digits, plus the square of the other digit is the number 21. The numbers are _______?

You'll need your translation skills and your "number" problem skills for this one. Let's work on (1) through (6), and your other threads, before getting too bogged down in this one, okay?

Please study the lessons in the links (this shouldn't take more than a few hours), learn the basic terms and techniques, and then attempt the exercises. If you get stuck, please reply showing all of your steps and reasoning so far. Thank you!

mrs.wright1976 said:

Actually, that's

*your* job! :wink:

I look forward to hearing from you!

Eliz.

P.S. Welcome to FreeMathHelp!