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

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

Question 37988: Find the slope of the line passing through the points (1,1) and (3,3).
Click here to see answer by fractalier(2101)

Question 37987: Write the equation of the line that passes through point (-6,7) with a slope of 0.
Click here to see answer by fractalier(2101)

Question 37987: Write the equation of the line that passes through point (-6,7) with a slope of 0.
Click here to see answer by checkley71(8403)

Question 38005: what is the least common multiple for each pair (3,4)
Click here to see answer by stanbon(57203)

Question 38008: what is the answer to 1 over 3/5??
Click here to see answer by vidhyak(94)

Question 38215: 3n/12 + 7n/12
Click here to see answer by fractalier(2101)

Question 38248: Evaluate the numerical expression.
(-216)^1/3
Click here to see answer by stanbon(57203)

Question 38269: Change 1/50 into a decimal.
Should it be .50
Click here to see answer by fractalier(2101)

Question 38268: One number is 8 less than another. If 5 times the smaller number minus 2 times the larger number is 14, find the two numbers.
Click here to see answer by fractalier(2101)

Question 38059: SUPPOSE EACH ORDER PAIRS ARE FOR THE SAME DIRECT VARIATION. FIND EACH MISSING VALUE.
A. (-1,2)AND (4,Y)
B. (X,-4) AND (-9,-12)
Click here to see answer by fractalier(2101)

Question 38444: Given f(x) = -x^3 + 3x^2 - x + 4
find
f(-2)

Did I do this correctly?

f(-2) = -(-2)^3 + 3(-2)^2 - -2 + 4
f(-2) = -(-8) + 3(4) +2 + 4
f(-2) = 8 + 12 + 2 + 4
f(-2) = 24
Click here to see answer by fractalier(2101)

Question 38445: write in simplest form 26/90
Should it be
26/90 = 2 times 13
3 times 3 times 2 times 5 equals 13/45

Click here to see answer by fractalier(2101)

Question 38446: Adult tickets for a play cost $17 and child tickets cost $2. If there were 32 people at a performance and the theater collected $364 from ticket sales, how many adults and how many children attended the play?
Click here to see answer by fractalier(2101)

Question 38485: What is the correct way to show a list of the factors of 88
Click here to see answer by stanbon(57203)

Question 38485: What is the correct way to show a list of the factors of 88
Click here to see answer by checkley71(8403)

Question 38533: V = C(Ro – R)R^2
where C > 0 is a constant based on individual body characteristics,
Ro is the radius of the windpipe before the cough, and R is the
radius of the windpipe during the cough. Find the value of R that
maximizes the velocity, and state the resulting maximum velocity.
I just want to confirm that I am on the right track?
V = C(Ro – R)R^2
= C Ro R^2 - CR^3
V'(R)= 0
CR(2Ro - 3R) = 0,
R = 0 or 2/3.
I think the elgebra may not be right?
Can someone please tell me if this is the right idea.
Thankyou.

Click here to see answer by Earlsdon(6287)

Question 38540: Hello! I've tried to approach this from a substiution standpoint but I'm at a loss :
Find the number of solutions for the system
(the following equations are all together in one bracket)
{f + g + h = 4
f = 5 - h - g
g + h = 7 - f
If you could help me on how I should approach this problem I would be very grateful!! Thanks!!!!!
Click here to see answer by venugopalramana(3286)

Question 38674: Simplify the following:
(-u2+4u-8) + (-u – 7) - (-8u2 + 9u + 1)
Please help me find the answer
Click here to see answer by AnlytcPhil(1276)

Question 38878: 4(x-1)+6 = 3x+1-2x
Click here to see answer by KneesAndToes(13)

Question 38877: 2+9x = -5x-18
Click here to see answer by KneesAndToes(13)

Question 38859: using elimination to solve this system of equations, how would i solve
8x-3y=-11
2x-5y=27
Click here to see answer by fractalier(2101)

Question 38922: 6. Solve the following system by addition. If a unique solution does not exist, state
whether the system is inconsistent or dependent.
x + 5y = 10
-2x – 10y = -20

Click here to see answer by checkley71(8403)

Question 39028: When a ball is thrown, its height in feet "h" after "t" seconds is given by the equation
h = vt - 16t^2
In this equation, v is the initial upwards velocity in feet per second. If v = 28 feet per second, find all values of t for which h = 12 feet.
Click here to see answer by stanbon(57203)

Question 39083: Please solve by graphing. Indicate whether each system is independent, inconsistent, or dependent. Thanks.
1. 3x - y = 4
3x - y = 0
Click here to see answer by mbarugel(146)

Question 39143: Help.
Problem: (4/x-y)- (3/y)
The answer is supposed to be 7y-3x/y(x-y)
I get the denominator but I don't get how they come up with 7y
Click here to see answer by stanbon(57203)

Question 39212: what is the value of Y when X=-3 for the function Y=4Xsquared+3X-1
Click here to see answer by Nate(3500)

Question 38731: When a ball is thrown, its height in feet "h" after "t" seconds is given by the equation
h = vt - 16t^2.
In this equation, "v" is the initial upwards velocity in feet per second. If v=28 feet per second, find all values of "t" for which h=12 feet.
Click here to see answer by fractalier(2101)

Question 39241: simplify the expression
x+3 2x-5
--- + ---
x+1 x-2
Click here to see answer by longjonsilver(2297)

Question 39241: simplify the expression
x+3 2x-5
--- + ---
x+1 x-2
Click here to see answer by fractalier(2101)

Question 39289: on my question muber 4 this is the problem (l=a strait up and down line) l6-14l-2.5(7) please help me
Click here to see answer by stanbon(57203)

Question 39296: Solve (2x-3)(x+5)(x-7)= 0.
Click here to see answer by fractalier(2101)

Question 39297: Solve (v-7)(v+5)=0.
Solve 7(b-5)^3=0.
Which solution is greater?
Click here to see answer by fractalier(2101)

Question 39298: Rewrite the equation 2x – 3y = -6 as a function of x.
Click here to see answer by fractalier(2101)

Question 39299: Rewrite the equation 2x – 3y = -6 as a function of x.
Click here to see answer by fractalier(2101)

Question 39300: 10. Graph f(x) = -x – 2
Click here to see answer by fractalier(2101)

Question 39082: SPlease solve by graphing. Indicate whether each system is independent, inconsistent, or dependent. Thank you for your help
1. y = 3x - 4
y= -2x + 1
2. 2x - 3y = 12
3y - 2x = -12
Click here to see answer by AnlytcPhil(1276)

Question 39394: 15. Adult tickets for a play cost $16 and child tickets cost $9. If there were 24 people at a performance and the theater collected $258 from ticket sales, how many children attended the play?
Click here to see answer by josmiceli(9645)

Question 39398: I am a beginner.
I am stuck on correct answer for:
IF x - two-sevenths(2 over 7)x = 5, then x =
I am not using a specific book. I am just practicing..........
Click here to see answer by emsum(1)

Question 39393: One number is 12 more than another. The sum of the smaller number and twice the larger number is 39. Find the larger number.
Click here to see answer by fractalier(2101)

Question 39392: One number is 12 more than another. The sum of the smaller number and twice the larger number is 39. Find the larger number.
Click here to see answer by fractalier(2101)

Question 39397: The length of a rectangle is 8 inches more than twice its width. If the perimeter of the rectangle is 28 inches, find the width of the rectangle.
Click here to see answer by fractalier(2101)

Question 39396: Vern invested $11,000. Part was invested at 15% and part at 13%. If the total interest at the end of the year is $1,610, how much did he invest at 15%?
2 pts
Click here to see answer by fractalier(2101)

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