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

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

Question 563622: Simplify the expression

2ln(e^A)+3lnB^e
Click here to see answer by Alan3354(30924)

Question 563695: A collection of 52 dimes and nickels is worth $4.50. How many nickels and dimes are there?
Click here to see answer by scott8148(6628)

Question 564117: I need help with substitution.
y=4x+5
y=3x+4
Thank you!
Click here to see answer by mananth(12269)

Question 564114: I need help with elimination.
x+2y=-1
2x-3y=12
Thank you!
Click here to see answer by mananth(12269)

Question 564110: I need help on Expressions involving variables, substitution.
"John paid $34 for two algebra and three geometry books. He paid $36 for three algebra and two geometry books. What is the cost of each book?"
Thank You!

Click here to see answer by mananth(12269)

Question 564290: Translate to an algebraic expression 16 increased by b
Click here to see answer by Alan3354(30924)

Question 564692: How do you solve y=4x and y=-x-15 by substitution?
Click here to see answer by mananth(12269)

Question 419123: Traffic signs are regulated by the Manual on Uniform Traffic Control Devices (MUTCD). The perimeter of some traffic sign must be 122 inches. Also, its length is 32 inches longer than its width. Find the dimensions of this sign.
Fill in the blank.
The width of the sign is _ inches?
The length of the sign is _ inches?

Click here to see answer by luckystar65(1)

Question 565136: what would m equal if it was in the problem m+3n=7?
Click here to see answer by jim_thompson5910(28476)

Question 565195: what is 12y+21=9y? i know the answer is -7 but i dont know how to find the answer or how to do the promblem please help!!!
Click here to see answer by jim_thompson5910(28476)

Question 565392: How do you write an equation for this table?
X=1, 2, 3, 4, 5, 6, 7
Y=1, 3, 7, 15, 31, 63, 127
Click here to see answer by Edwin McCravy(8879)

Question 565524: Solve by the substitution method.
4m + n = 33
m - 7n = 30
Click here to see answer by stanbon(57203)

Question 565855: Add the equations, then solve for the variable.

5e+7f=6
2e-7f=22
Click here to see answer by ad_alta(240)

Question 566566: Solve this question using substitution y=5x+5 y=15x-1
Click here to see answer by Maths68(1474)

Question 566793: Evaluate: f (-(2)/(3)) if f (x) = (x)/(2)
Click here to see answer by solver91311(16868)

Question 566816: Solve: (for y) M - 3N = Y+ N
Click here to see answer by jim_thompson5910(28476)

Question 566840: The value of an uncircumcised "Mint State-65' 1950 Jefferson nickel minted in Denver is 7/5 the value a nickel minted in Philadelphia in similar condition. Together the total value of the two coins is $36. what is the value if each coin?
Click here to see answer by solver91311(16868)

Question 567019: 2x+3y=29
5y-4x=19
Click here to see answer by mananth(12269)

Question 567028: What is the ordered pair(x,y) form
3x + 5y = 21
-9x + 4y = -6
Click here to see answer by mananth(12269)

Question 567358: w=s/f solve for f
can you show the steps? Thanks!
Click here to see answer by stanbon(57203)

Question 567537: help me solve this
2/3m - 2(1/6m + 4)= -m + 12
Click here to see answer by unlockmath(1599)

Question 567770: 3a-b=5
a=3/4b
the answer is (3,4) and i don't understand why
Click here to see answer by jim_thompson5910(28476)

Question 567916: What is M-2?

Click here to see answer by Alan3354(30924)

Question 568018: Write the fraction in terms of the LCM of the denominators.
9 over (x-1)^2 , 6 over x(x-1)
I thought I was supposed to find the LCD. How do you solve this?
I know the answer is 9x over x(x-1)^2 , 6x-6 over x(x-1)^2
but I don't understand how to get to that.
Click here to see answer by stanbon(57203)

Question 568501: I need help for this question:
Define variables and write an equation to model the relationship in each table.
Number of hours. Total Pay
4 $32
6. $48
8. $64
10. $80
Any help would be appreciated! Thank you!
Click here to see answer by jim_thompson5910(28476)

Question 568528: 1/3(x-2)=4
Click here to see answer by jim_thompson5910(28476)

Question 568531: You have 8 bags of grass seed. Each bag covers 1200 ft squared of ground. The function A(b)= 1200b represents the are A(b), in square feet, that b bags cover. What domain and range are reasonable for the function? Explain.
Click here to see answer by jim_thompson5910(28476)

Question 569044: -2x+5y=13;solve for x
Click here to see answer by jim_thompson5910(28476)

Question 569241: Let a, b,c be positive integers with a>=b>=c such that
a^2 - b^2 - c^2 +ab=2011
and
a^2 + 3b^2 + 3c^2 -3ab -2ac-2bc=-1997
what is a?
Click here to see answer by richard1234(5390)

Question 569597: so is there an easier way to do this problem 14y+10=23y-17
Click here to see answer by TutorDelphia(193)

Question 569597: so is there an easier way to do this problem 14y+10=23y-17
Click here to see answer by Alan3354(30924)

Question 569896: I have an assignment for solving inequalities. I had to write an expression that would represent the cost of any amount of ceramic tile given that ceramic tile costs $2.00 per square ft. (use variable c to represent a square foot of ceramic tile). Do not write an equation. My answer to this was $2.00 per square ft=2c.
Write an expression that would represent the cost of any given amount of the decorative tile given that decorative tile costs $5.00 per square ft. (use variable d to represent a square ft of decorative tile). I wrote $5.00 per square ft=5d
Would you please let me know if this is correct because there still are 10 more parts to this and I have to write them as inequality equations.
Click here to see answer by stanbon(57203)

Question 569886: 5x - 4 - x = -3x - 6 - x
Click here to see answer by jim_thompson5910(28476)

Question 569999: I got the problem:
5r-s=5
-4r+5s=17
on my homework and every time I try solving it I get really long decimals for my coordinates. I don't know if I'm substituting the wrong numbers in or if I'm my error is just in the math.
Click here to see answer by jim_thompson5910(28476)

Question 570120: 4x+3x+2=7 What does "x" equal?

Click here to see answer by Maths68(1474)

Question 571246: how do you solve
-8x2+22x-5
Click here to see answer by scott8148(6628)

Question 571246: how do you solve
-8x2+22x-5
Click here to see answer by Alan3354(30924)

Question 571641: Can you please help me solve this:
4[-88-(-56-6]=
Click here to see answer by Alan3354(30924)

Question 571768: I am having alot of trouble with these types of questions..
y=7/6x+4
-x+y=1
Click here to see answer by josmiceli(9645)

Question 572134: Time to reach Pluto. Suppose that it takes about 3 days for a space vehicle to travel from earth to the moon. About how long would it take the same space vehicle traveling at the same speed to reach Pluto? Express the answer in scientific notation.
Click here to see answer by Alan3354(30924)

Question 572136: Without performing actual computations, explain why (-29)(-29)(-29) is smaller than (-29)(-29).
Click here to see answer by Alan3354(30924)

Question 572135: Time to reach Mars. Suppose that it takes about 3 days for a space vehicle to travel from Earth to the moon. About how long would it take the same space vehicle traveling at the same speed to reach Mars? Express the answer in scientific notation.
Click here to see answer by Alan3354(30924)

Question 572150: 14/5670
Click here to see answer by jim_thompson5910(28476)

Question 572151: 3333/4
Click here to see answer by jim_thompson5910(28476)

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