Need help with algebraic expression please?

Question

Write an algebraic expression for each phrase.

1. p multiplied by 3

2. n less than 7

write a phrase for each algebraic expression for each phrase.

3. s - 10

4. ab+2

Define a variable and write an algebraic expression for each phrase.

5. the sum of 4 and a number

6. 3 increased by a number

7. 12 less than a number

Define a variable and write an algebraic equation to model each situation.

8. The number of gal of water used to water trees is 30 minutes the number of trees.

9. What is the number of marbles left in a 48-marble bag after some marbles have been given away?

10. What is the cost of buying several pairs of pants at $32.95 per pair??

These confuse me and i need help so if u can explain to me how to do these problems would be great!

Thank you in advance :D

Answer 1

1. you take p and 3 and put them next to each other to mean multiplication.      p3

2. you take n and 7 and make it      7-n

3. do the opposite opperation and make it in word form.    10 more than s

4. turn the problem around and write it in word form.      2+ab

5. you have 4 of somthing and get x more.      x+4

6. you have 3 and get x more.    3+x

8. you take the number of trees and devide it by the number of gallons.     30/8     (thirty devided by eight)

9.you have 48 marbles and give x away      48 - x

10. you buy x pairs of pants at $32.95 each      $32.95x     ($32.95 times x # of pants

Answer 2

IF you truly want HELP and not just the answers, email me and I'll be glad to help you understand what each type is asking you to do but the first poster is right, you have to know how to do this stuff yourself before you get so deep in the class and drown!

Answer 3

1.    p3

2.    7-n

3.    10 less than s

4.    2 more than ab

i got bored

Answer 4

1)  Straightforward.  P multiplied by 3 is is P times 3, P*3, or 3*P, or just 3P

2)  Word order is a little different than math order.  "N less than 7" means "7 made less by N" means "7 minus N" means 7-N

3) is just like 2) backwards -- ( S - 10 ) is "S made less by 10" is "10 less than S" or "ten less than some number"

4) ( AB ) can be spoken as "the product of A and B".  ( AB + 2 ) can be spoken as "the product of A and B made greater by 2" or "2 more than the product of A and B"

for 5 through 7, I'll define "N" as my variable

5) "the sum of 4 and a number" means "a number made greater by 4" means ( N + 4 )

6) "three made greater by a number" is ( 3 + N )

7) "12 less than a number" means "a number made smaller by twelve" means ( N - 12 )

for 8 through 10, I'll still use N.  I'll also use X.  N for the number I can plug in, X for the answer to the question.

I think there's a typo in 8), so I'm not going to address it

9) "the answer is 48 made less by some number"  

X = 48 - N

10) "the answer is the product of some number of clothes and the cost of each piece"

X = N * $32.95

To answer 10), you have to already know that the total cost is equal to the product of the number of items bought and the price for each item.  

And, you have to simply assume that either the question is about the cost before taxes, or that the given price already includes tax, or that tax simply doesn't matter.  Sometimes math classes want you to assume stupid things.

Answer 5

1. p3

2. 7-n

3. 10 less than s

4. 2 more than the product of a and b

5. 4+n

6. 3+x

7. x-10

8. ?

9. 48-x

10. $32.95x/2

I'm not really good at explaining, but by having the answers, I hope they will help by being a model to future questions on the same topic.

Answer 6

Hun, this is very basic stuff, and is the foundation to algebra.  You really need to learn it & not ask for Yahoo Answers to do your homework for you. You have to have a text that can help you with the answers.  Please do yourself a favor and ask for help from the teacher now before you get too far into the school year.