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

Tutors Answer Your Questions about Expressions-with-variables (FREE)

Question 334302: 4x-7y=8
-2x+5y=-1
I have struggling with this problem for quite awhile now. Please help!
Click here to see answer by stanbon(57290)

Question 334370: Solve for a:
-(a+8)=(a-1)+6
Click here to see answer by rfer(12655)

Question 334344: Algebraic expession for the sum of twice a number and 7
Click here to see answer by rfer(12655)

Question 334515: Please tell me if I have solved this problem correctly. What is the value of y-x when y= -11/16 and x= 18/32?
This is how I solved the problem:
-11/16 - (18/32) = -22/32 - (18/32)= -40/32= -5/4

Thank you for your help
Click here to see answer by solver91311(16877)

Question 334556: "two thirds of a number" can you help me make it into and algebraic expression?
Click here to see answer by Alan3354(30993)

Question 334553: how to make "the sum of a number and ten" into a mathmatical expression
Click here to see answer by Alan3354(30993)

Question 334559: how do you make "three more than the sum of a number and four" into and algebraic expressiom?
Click here to see answer by Fombitz(13828)

Question 334559: how do you make "three more than the sum of a number and four" into and algebraic expressiom?
Click here to see answer by Edwin McCravy(8895)

Question 334574: eight more then twice a number--------how do u make tht an algebraic expression?

Click here to see answer by jim_thompson5910(28536)

Question 334316: Help is very, very much appreciated! I need to understand this problem but do not want just the answer, please. I would like to understand the concept and would appreciate learning how to solve the following problem.
A company sells an item for x dollars each. The monthly revenue for this model is given by the formula R(x)=-0.08x^2 + 300x. Revenue is the product of the price x and the demand (quantity sold). I need to factor out the price on the right-hand side of the formula. Then, write a formula D(x) for the monthly demand. and find D(3000).
Thank you, kindly.
Click here to see answer by ankor@dixie-net.com(15646)

Question 334588: Can you solve this expressions and show work?
[4(5-3)-2(4-8)]/16

Click here to see answer by rfer(12655)

Question 334655: please help me solve this expression:(24-11)-(3+2)/4
Click here to see answer by stanbon(57290)

Question 334325: what is the algebraic expression of 5b - 10
Click here to see answer by nyc_function(2733)

Question 334322: what is the algebraic expression of 5b-10
Click here to see answer by nyc_function(2733)

Question 334779: 14a to the 2nd power + 13b to the second power+27
Click here to see answer by nyc_function(2733)

Question 334743: write an expression for the sum of 1 and twice a number n. If you let n be any odd number, will the result always be an odd number?
Click here to see answer by Fombitz(13828)

Question 334960: the u.s. senate has 100 members, all democractic or replublican. recently they where 12 more democracts than replublicians. How many senators from each replublican party where there at the time.
Click here to see answer by solver91311(16877)

Question 334992: 3x-y=0
2x-y=-1
Click here to see answer by checkley77(12569)

Question 335013: Write an expression that represents the volume of a pyramid.
Click here to see answer by stanbon(57290)

Question 334927: evaluate:
1(1)/(12)/-1((1)/(10))
Click here to see answer by checkley77(12569)

Question 335040: write an equation to model the relationship in this table.
(in a table) total cost change from $10
$10.00 $0
$9.00 $1.00
$7.50 $2.50
i have figured out some problems somewhat like this and i have asked my algebra teacher to explain and i still didn't understand what he meant. i would greatly appreciate your help.
Click here to see answer by stanbon(57290)

Question 335058: the number of weeks in D days
Click here to see answer by Alan3354(30993)

Question 335099: if t is tyhe number of teaspoons then 1/3t can be used to find the number of tablespoons.find the tabelspoons of spice in each recipe.
3 teaspoons
2 teaspoons
4 teaspoons
7 teaspoons
Click here to see answer by solver91311(16877)

Question 335048: solve for a: -(a+8)=5(a-1)+6

solve for a: (a+8)=5(a-9)+17
Click here to see answer by rfer(12655)

Question 335154: k=s/2(p+f) solve for p
can u please show me how u did it step by steps? thank you
Click here to see answer by nyc_function(2733)

Question 335153: k=s/2(p+f)
Click here to see answer by nyc_function(2733)

Question 335160: 2y2-2y +37=(y-5)2
Solve for y
Click here to see answer by benazir.sj@gmail.com(109)

Question 335061: Solve the following by substitution and elimination:
On a football field during a game, Player A who runs the 40 yard dash in 4.9 seconds catches the ball at his own 30 yard line, then takes off running toward the goal line. Player B who runs the 40 yard dash in 4.5 seconds is standing on the 25 yard line when Player A catches the ball, he then pursues the ball.
Click here to see answer by Theo(3458)

Question 335195: C=5/9(s-32)
Solve for S
Click here to see answer by JBarnum(2044)

Question 335185: 4n-12 when n=7.
Click here to see answer by Fombitz(13828)

Question 334179: 1/5x - 1/3x= 4 solve for x. what is the process that is needed to complete problem?
Click here to see answer by Fombitz(13828)

Question 335290: Please help me write an algebraic expression for the following word phrase
8 less than the product of a number x and 4
Click here to see answer by Fombitz(13828)

Question 335437: what is the variable and an algebraic equation this is the question what is the total cost of buying several shrits at $24.95 each?
Click here to see answer by stanbon(57290)

Question 335439: my name is Zach and I am in 7th grade pre Algebra it is my 2nd day of class and I am stumped by a problem. I was wondereing if you could help me? I am to write a numerical or variable expression for the quantity (the value in cents of n nickles) I haven't been able to figure anything out because I feel like I don't have enough information I am at the point of frustration
Click here to see answer by solver91311(16877)

Question 335476: what are the steps to solving 6a + 12b - 12 + (b + 15)55
Click here to see answer by Fombitz(13828)

Question 335503: 12-7(Y)=-2/5

Click here to see answer by Fombitz(13828)

Question 335462: 2 more than the quotient of a number and 5
Click here to see answer by nyc_function(2733)

Question 335505: (2x-5).7=4
Click here to see answer by Fombitz(13828)

Question 335546: Hanson drove 200 kilometers at x km/hr and then decreased his speed 20 km/hr and drove 240 extra kilometers. Write a rational expression for his total traveling time. Evaluate that expression for x = 100 km/hr.
Click here to see answer by mananth(12270)

Question 335587: what is the value of "a" in the equation a=xy2 when x=2 and y=2. would like individual steps for arriving at the solution. Thanks
Click here to see answer by stanbon(57290)

Question 335545: Reduce to lowest terms 3/y-3/2y+4
Click here to see answer by Fombitz(13828)

Question 335584: how to write k+2.5 in a alegbra expression
Click here to see answer by Alan3354(30993)

Question 335540: I need help on expressions!
especially fractions and knowing if it is negative or positive
Click here to see answer by nyc_function(2733)

Question 335548: The Griswalds averaged 45 mph on their way to Las Vegas and 60 mph on the way back home using the same route. What is the distance from their home to Las Vegas if the total driving time was 70 hours.
Click here to see answer by Fombitz(13828)

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