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

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

Question 167247: 7x-3(2x+5)=3(x+5)+7(x+4); solve for x
Click here to see answer by Alan3354(30993)

Question 167248: Three times the absolute value of two "x" plus 4 is less than or equal to six. What does "x" equal.
Click here to see answer by Fombitz(13828)

Question 167273: Can you please help? Appreciate it! Thanks
A sugar donut has 110 more calories than twice the number of calories in a slice of brown bread.
A. If x represents the number of calories in a slice of brown cread, write an expression that represents the number of calories in a sugar donut.
B. Write an expression that represents their number of calories together.
C. Write an inequality that represents that together they contain at least 194 calories.
D. What is the smallest number of calories in the slice of bread?
Click here to see answer by stanbon(57377)

Question 167275: Jeff and Jermaine go ice-skating. Every hour of skating costs each of them $2.
A. If Jermaine spends $7.00, how long does she skate for?
B. Jeff spends at most $12.00, but also has to rent skates for $3.50. Write and solve an inequality that determines how long Jeff can skate.
C. How long could they skate together?
D. Write an inequality that would represent how much longer Jeff could skate than Jermaine.
Thank you very much1 Appreciate it!
Click here to see answer by Mathtut(3670)

Question 167434: Well I didn't know which kind of problem it was so I'm wondering if you could help me with a couple questions:
If flour comes in 2 pound bags and in 5 pound bags, list all the ways to buy exactly 18 pounds of flour. Draw a graph and loacte the solutions on teh graph. What can you say about the solutions that appear on the graph?
NEXT QUESTION:
Ms. O'Brien has written a math exam with two parts. Part I has 9 questions , and part II has 8 questoins. She wants to know how to assign points to each part so that the total will be exactly 100 points. Find a Diophantine equation that represents this situation and solves Ms. O'Brien's problem.
Make a table to represent tests that ahve 9 qeustions in part I, 8 questions in part II and 200 points in all.

LAST QUESTION:
How can you tell that 4x + 6x = 125 has now whole-number solution?
How can you tell that 5x + 10y = 112
How can you tell whether 6s + 9y = 100 has whole-number solutions?
Click here to see answer by vleith(2825)

Question 167478: Which of the following expressions represents the product of 3 less than twice x and 2 more than the quantity 3 times x?
A. -6x2+25x+6
B. 6x2+5x+6
C. 6x2-5x+6
D. 6x2-5x-6
E. 6x2-13x-6
Click here to see answer by jim_thompson5910(28595)

Question 166170: simplify and combine (-7x^2+3xy-5y^2)-(-2x^2-xy+y^2)+(-x^2-7y^2)
Click here to see answer by partygirl1122(6)

Question 167545: 0.05x+0.25y=44
0.15x+0.05y=48
Elimination method:
Click here to see answer by sowmya(32)

Question 167544: elimination method:
9x-9y=36
7y-3x=-14
Click here to see answer by sowmya(32)

Question 167543: solve by elimination method:
0.3x-0.2y=4
0.4x+0.3y=73/19
Click here to see answer by aswathytony(47)

Question 167543: solve by elimination method:
0.3x-0.2y=4
0.4x+0.3y=73/19
Click here to see answer by sowmya(32)

Question 167542: Solve by elimination method:
5x+5y= -13
7x-3y= 17
Click here to see answer by sowmya(32)

Question 167542: Solve by elimination method:
5x+5y= -13
7x-3y= 17
Click here to see answer by aswathytony(47)

Question 167647: 9w+5=4 (3w-1)
if w equals 3 does this mean that 9 is multiplied by 3 if w=3?
Click here to see answer by stanbon(57377)

Question 167647: 9w+5=4 (3w-1)
if w equals 3 does this mean that 9 is multiplied by 3 if w=3?
Click here to see answer by Mathtut(3670)

Question 167647: 9w+5=4 (3w-1)
if w equals 3 does this mean that 9 is multiplied by 3 if w=3?
Click here to see answer by partygirl1122(6)

Question 168010: Please factor completely
4x^2 - 28x + 40
Click here to see answer by nerdybill(6962)

Question 168011: Please factor
u^2 - 2uv - 63v^2
Click here to see answer by nerdybill(6962)

Question 168009: Please factor by grouping
2x^3 - 4x^2 - 3x + 6
Click here to see answer by nerdybill(6962)

Question 168012: Question regarding slopes: If m = slope and m varies directly as t
If m =13 when t=2, what is m when t=6?
Click here to see answer by KnightOwlTutor(293)

Question 168012: Question regarding slopes: If m = slope and m varies directly as t
If m =13 when t=2, what is m when t=6?
Click here to see answer by jojo14344(1512)

Question 168087: im not sure if im in the right spot but i really nee help. been working on this all weekend.
Solve for x:
(x – 2)/4 – 1/5 = (7x + 1)/20
please help
Click here to see answer by oscargut(891)

Question 168008: Please factor
60m^9 + 72m^7 - 24m^3
Click here to see answer by ankor@dixie-net.com(15657)

Question 168194: ok i've tried this many times. every time i check it though, it's not right so i try a different way, but then it's still not right. i've got 2/3 and 3/2 and something else really weird. please help me. the problem is:

x-1 over -4 =2/3
Click here to see answer by checkley77(12569)

Question 168381: How me to solve: Find the value(s)that can replace the variable in the expression and cause the expression to be undefined.
2x-3
__________
2x^2 +5x-3
and
2x+4
_____
x^2 +4

Click here to see answer by stanbon(57377)

Question 168495: John owns a hotdog stand. his profit is represented by P(x)=-x^2+14x+54, with P(x) being profit and the x the number of hotdogs sold. What is the most he can earn?
Click here to see answer by nerdybill(6962)

Question 168496: cind the zero of the polynomial function and stat the multiplicity of each. f(x)=x^4-18x^2+32 (the ^4 and ^2 are powers)
Click here to see answer by Earlsdon(6287)

Question 168744: A girl standing 6 feet from a lamp post cast ashadow 3 fet long. If the girl is 4 feet tall, how tall is the lamp?
Click here to see answer by scott8148(6628)

Question 168757: I need help solving this problem, I just can't seem to get it straight in my head. I am supposed to simplify and combine like terms
(1/3)(4x + 4) - (2/3)(5x - 3)
thanks
Click here to see answer by checkley77(12569)

Question 168788: translate each algebraic expression into words
3+ w
8x
40 - p

Click here to see answer by Mathtut(3670)

Question 168835: The temperature was 15C at noon when the cold front entered the area. The temperature began dropping at a rate of 7C per hour for the next several hours. Write an expression for what the temperature was after h hours. Evaluate the expression to find the temperature after 4 hours.
A submarine is 10 feet below sea level. it dives 8 feet per second. write an expression to describe the submarines position after s seconds. evaluate the expression to find the submarines position after 30 seconds.
Click here to see answer by stanbon(57377)

Question 168843: 5x-3=13-3x
im having a hard time understanding when youre suppose to add and when your suppose to subtract, also i dont understand how youre suppose to combine variables
Click here to see answer by jim_thompson5910(28595)

Question 168931: The weight of an object varies inversely with the square of the distance from earth's center (3,960 miles). A man weighs 250 lbs on the surface of the earth. How much would he weigh in an airplane flying at 30,000 ft?
Click here to see answer by Alan3354(30993)

Question 168978: 15x-10y=-5
15y=4+5x
Click here to see answer by checkley77(12569)

Question 169141: How do you solve?
x=1/5 y
3x+2y=26
Click here to see answer by Alan3354(30993)

Question 169140: how do you solve
x+3=23
3x-2y=3

Click here to see answer by checkley77(12569)

Question 169234: The problem is this:
(1-2x)(3x+1)-(x-1)^2
What I have done is this:
(x-1)^2 = x^2 -2x +1
And using FOIL, (1-2x)(3x+1) =
3x +1 -6x^2 -2x
So, simplified, the equation reads: -x -7x^2 +2 or -7x^2 -x +2
But the multiple choice answers are:
a. x(3-7x)
b. -7x^2 -x
c. -7x2 -5x
d. -7x^2 +x
e. None of these
Am I right? Is it e. none of these? Please help!
Click here to see answer by nerdybill(6962)

Question 169229: I know this is a very simple type of equation, but I've forgotten which ones can cancel out and which have to stay.
This is the problem:
(6a)(-4b)
_________
(-2ab)(-3b)
It's multiple choice, so the possible answers are:
A. 4b
B. 4/b
C. -4a
D. -4/a
E. -4/b
Please help!
Click here to see answer by Mathtut(3670)

Question 169443: Express .46 as a fraction in simplest form.
Click here to see answer by Mathtut(3670)

Question 169402: Lin Hisa plans to invest $1,400 in two stocks: Consolidated Industries (CI) and Amalgamated Manufacturing (AM). Suppose that after 5 years Lin's CI stock does not change in value, but her AM stock triples, making her stocks worth $3,300. Write an equation that expresses this fact.
Click here to see answer by gonzo(654)

Question 169534:
Click here to see answer by maali40(13)

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