Questions on Algebra: Expressions involving variables, substitution answered by real tutors!

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Algebra: Expressions involving variables, substitution

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Question 77441: 5+(6+7)= 5+(7+6)=
Click here to see answer by stanbon(26259)

Question 77440: 6*(5+4)=
Click here to see answer by stanbon(26259)

Question 77439: BTO THE POWER OF 2 TAKE A WAY 2BC PLUS CTO THE POWER OF 2 EQUALS
Click here to see answer by stanbon(26259)

Question 77414: THE SIMPLE I ON A PRINCIPAL OF P DOLLARS AT INTEREST RATE R FOR TIME T, IN YEARS, IS GIVEN BY I = PRT SIMPLE INTEREST ON A PRICIPAL OF $6000 AT 3% FOR 2 YEARS
Click here to see answer by stanbon(26259)

Question 77468: A board 28 feet long is cut into two pieces, and the lengths of the two piecs are in ratio of 2 to 5. Find the lengths of the two pieces.
Click here to see answer by prabhjyot(164)

Question 77088: Write each expression in simplest form.
4r^2 – 25s^2 / 2r^2 + 3rs – 20s^2

Click here to see answer by ankor@dixie-net.com(6691)

Question 77512: A cooper wire 110 centimeters long was bent in the shape of a rectangle. The lenght of the rectangle was 10 centimeters more than twice the width. Find the demension of the rectangle.
Click here to see answer by ptaylor(1578)

Question 77515: How long will it take $8000 to triple itself if it is invested at 6% simple interest.

Click here to see answer by Edwin McCravy(2920)

Question 77529: Multiply : (4x^2y^2), (6ax^2y^6)
The answer I came up with is: 24ax^4y^12
Explanation for my answer: I multiplied 4*6, then x^2 and left the "a" as is. I also muliplied y^2 * y^6. Please help me thank you!
Click here to see answer by Earlsdon(4898)

Question 77579: w/4 - 5y
Click here to see answer by stanbon(26259)

Question 77535: Add: (5x^2+7y-6z^2),(4y+3x^2), (2y-2x^2)
The answer I came up with is: 6x^4+13y^3-6z^2
I got this answer by add all the likes ie..5x^2+4x^2....Ididn't put 10x becuase I subtracted the -2x; and by adding the exponents for the like. Please help me.
P.S. I got help earlier from Earldson but I couldn't figure out how to post my thank you comments publically any help in that would be appreciated also. Thank you
Click here to see answer by stanbon(26259)

Question 77728: -33x/3
Click here to see answer by checkley75(3666)

Question 77939: A cashier has a total of 126 bills, made up of fives and tens. The total value of the money is $840. How many of each kind does he have?
Click here to see answer by stanbon(26259)

Question 77946: A merchant wishes to mix candy worth $5 per lb with 40lb of candy worth $2 per pound to get a mixture that can be sold for $3 per lb. How many pounds of $5 candy should be used?
Click here to see answer by checkley75(3666)

Question 78036: 8x-2x[6-3(x-4y)]
Click here to see answer by tutorcecilia(2042)

Question 78125: Solve and check the following equations for x.

5/x+6 + 2/x^2 + 7x+6 = 3/x+1

Click here to see answer by ankor@dixie-net.com(6691)

Question 78174This question is from textbook prentice hall algebra 1
: 6-2
this is not 6 minus 2 this is 6 to the second negative powerThis question is from textbook prentice hall algebra 1

Click here to see answer by stanbon(26259)

Question 78112: 1. A woman has 4 children. The eldest is 3 years older than the second child, who is 3 years older than the youngest child. The youngest child is one half the age of the oldest child. How old are the children.
2. A card is cut from a pack of playing cards. Determine the probability that it will be an ace or the king of hearts.
3. A coin is tossed and a die is rolled. What is the probability of getting:
· A tail and a 5?
· A head and an even number?

Click here to see answer by stanbon(26259)

Question 78208: Solve the system y=2x+3 and y=4x+7 using the substitution method.
Click here to see answer by bucky(1732)

Question 78317: when in the trinomials the last number is 0 what is the next step?
Click here to see answer by stanbon(26259)

Question 78378: please show me step by step how this one is solved
1/x-2 = 3/x-3
Click here to see answer by dolly(163)

Question 78377: I am not sure if this is solved by substitution, or elimination
4x - 6y = -14
x + 4y = 13
Click here to see answer by dolly(163)

Question 78395: we are learning algebra in my 6th grade advanced class but i am not catching on to it very well so i need some help on it can you give me some ways to get to learn it better. how do you go through the process step by step and get the exact awnser without skipping some steps? my teacher told us to remember a saying but it still dosent help me very well.
Click here to see answer by checkley75(3666)

Question 78487: Josh collected 12 more than 4 times the number of baseball cards Sarah collected . If Josh collected 72 baseball cards, how many did Sarah collect?
Click here to see answer by rmromero(383)

Question 78549: what is t if
Click here to see answer by ankor@dixie-net.com(6691)

Question 78646: Solve by substitution.
4x - 12y =5
-x + 3y = -1
Please help.
Click here to see answer by Septimus314(7)

Question 78810: Multiply. (2x – 5y)(3x – y)
Click here to see answer by mathdoc314(58)

Question 78902This question is from textbook Algebra I
: (6ab^2/35b)(42a/18ab)This question is from textbook Algebra I

Click here to see answer by mathdoc314(58)

Question 78805: Factor. 7x(x – 2y) + 6(x – 2y)
Click here to see answer by jim_thompson5910(13787)

Question 78807: Multiply. (2c + d)(2c – d)
Click here to see answer by sprolden(40)

Question 79180: This is actually two equations using variables using the substitution method.
I've been stuck on this for a long time.
x-3y=2
x+2y=-3
Thank you!
Click here to see answer by Earlsdon(4898)

Question 79150: I am having trouble solving this system using the substitution method. 2x + y = -1....then underneath x^2 = 4 + y. Thanks for your help!
Click here to see answer by scott8148(3382)

Question 79203: My son and I can't find the solution to this question. 148 people attend a 5 day camp. The chef needs 9 lbs of food for each child and 12 lbs for each adult.He needs a total of 1410 lbs of food. How many children and how many adults attend camp? We figured that there are 26 adults and 122 children but we can't set it up using two variables. Please help!
Click here to see answer by ankor@dixie-net.com(6691)

Question 79345: Find the constant of variation k m varies directly with n; m=144 when n=8
Click here to see answer by stanbon(26259)

Question 79347: Question: three times the number added to four:
Answer: Could either be 3(x+4)= or 3x+4=
Click here to see answer by stanbon(26259)

Question 79375: 7X2-7x-42
7x squared -7x -42 Factor
Click here to see answer by jim_thompson5910(13787)

Question 79557This question is from textbook
: A daughter is 28 years younger than her father. In 5 years, the father will be 3 times as old as the daughter. How old is each now?This question is from textbook

Click here to see answer by stanbon(26259)

Question 79680: please help me simplify this exression:
Click here to see answer by josmiceli(3003)

Question 79701: m^2+4m-4=29 can you solve, please explain
Click here to see answer by checkley75(3666)

Question 79778: Solve the following system of equations using the addition (elimination) method. Be sure to state the solution to the system.
x+2y=-7
2x+3y=-12
Click here to see answer by jim_thompson5910(13787)

Question 79856: solve by the additon method
x-2y= -24
-6x-3y= 9
I appreciate any helP!
Click here to see answer by checkley75(3666)

Question 79998:
Click here to see answer by sofiyacherni(99)

Question 79996: Answer the following using graphing method
x+3y=4
x=3
Click here to see answer by vertciel(183)

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