Questions on Algebra: Linear Algebra (NOT Linear Equations) answered by real tutors!

Tutors Answer Your Questions about Linear Algebra (FREE)

Question 88149: Factor this completely
3x^2 +23x -36
Click here to see answer by jim_thompson5910(35256)

Question 88150: Factor completely
7x^2 -28y^2
Click here to see answer by Flake(45)

Question 88425: These problems came from my daughter's professor. If they are from a text, we do not know the ISBN.
I am trying to help my daughter (35y.o) who is taking an Algebra course. It has been 40+ years since I have done this type of math.
The questions are:
A. Graph the function f(x)=-3x+7. Be sure to properly label the graph, which includes labeling the axes and the line with its equation.
B. Graph the function f(x)=-3x(sq) +x -5. Same rule as above.
I would appreciate any assistance. This one really confused me.
Click here to see answer by stanbon(75887)

Question 89206: For the quadratic function Q(x)=x^2+5x-36, determine the y-intercept.
Click here to see answer by Nate(3500)

Question 89207: Find the solution sets for
2x^2+3x-5=0
Click here to see answer by Nate(3500)

Question 89205: Find the solution set for
x^2-21=4x
Click here to see answer by Nate(3500)

Question 89229: Determine the value(s) of for which the following system of equations has nontrivial solutions.
(k+4)x + (k-2)y = 0
4x + (k-3)y = 0
Please explain how you get the answer so I can do the others.
Thank you,
Click here to see answer by Edwin McCravy(20054)

Question 89344: Can you help with find the solution of sets for
|3x+4|< 13
Click here to see answer by THANApHD(104)

Question 90449: help solve the following I am having great difficulty:

Click here to see answer by malakumar_kos@yahoo.com(315)

Question 90800: i need help with the following question:
rewrite the equation as a function of x
-3x+4y =11
thank you
Click here to see answer by malakumar_kos@yahoo.com(315)

Question 90800: i need help with the following question:
rewrite the equation as a function of x
-3x+4y =11
thank you
Click here to see answer by praseenakos@yahoo.com(507)

Question 90799: evalute each function for the value specified:
f(x)= x (to the second power) - 7x +10,
find (a) f(0), (b)f(5), and (c) f(-2)
thank you for your help
Click here to see answer by malakumar_kos@yahoo.com(315)

Question 90798: evalute each function for the value specified:
f(x)= x (to the second power) - 7x +10,
find (a) f(0), (b)f(5), and (c) f(-2)
thank you for your help
f(0)=10 f(5)=5^2-7*5+10=0 f(-2)=(-2)^2-7*(-2)+10=28
Click here to see answer by maths0503(3)

Question 90839: if f(x) = 5x-1 then find the following f(a-2)
i am so lost on where to begin with this, thank you for the help
Click here to see answer by Nate(3500)

Question 90840: graph the functions f(x) = -2x -5
can anyone help me with this?
thank you
Click here to see answer by jim_thompson5910(35256)

Question 90953: WORD PROBLEM - HELP PLEASE!!!!
Your company directors figure the company needs to make at least 12 heat seaking and at least 20 radar guided missiles per month to meet quota. In addition, production limits the number of missiles to no more than 72 per month. you can sell the heat seaking missiles for $312,000 and sell the radar guided missiles for $512,000. how many of each should you sell to maximize profits per month. what is the maximum profit???? OH HELP!!!!
I need the following:
constraints
objective function
graph and SOLUTION
THANKS
LLo
Click here to see answer by stanbon(75887)

Question 91005: Translate to an algebra statement. Seven times the difference of six and twice a number yields the same result as the same number decreased by one.
So far I have came with this. I am not if this is correct.
7(6-2x) = 7(6-2X)-1
Click here to see answer by psbhowmick(878)

Question 91279: Give the sum p+q where p/q is the reduced fraction represented by repeating decimal 1.36(bar over 36).
answers:
a. 13
b. 19
c. 26
d. 28

Click here to see answer by Earlsdon(6294)

Question 91951: im not sure what kinda problem this is but i cant figure out HOW to solve it in steps. Jim can fill pool carying buckets of water in 30 min.Sue can do same job in 45 min. and tony can do it in 1 and 1/2 hours.How quickly can they all do the job together?
Click here to see answer by mathispowerful(115)

Question 92012: 2x+ 3y = 6 (for x)

D = c-s over n ( for s)
Click here to see answer by funmath(2933)

Question 92559: Find an equation in standard form of the line described.
has x-intercept 4 and y-intercept -8
Ch.3

Click here to see answer by chitra(359)

Question 92921: Given r(x)=7x-22 and t(x)=x^2+3, express the sum (r+t)(x)
Click here to see answer by stanbon(75887)

Question 92935: f(x) = 3x(2x � 1). f(�1) =
Click here to see answer by psbhowmick(878)

Question 92935: f(x) = 3x(2x � 1). f(�1) =
Click here to see answer by Earlsdon(6294)

Question 93233: please help me solve this equation:
f(-6)
Click here to see answer by tutorcecilia(2152)

Question 93236: I am so confused, can you please help me with this question:
Click here to see answer by Earlsdon(6294)

Question 93239: I am so lost, if anyone could please answer this one I'd really appreciate it: What is the domain of g(x) when
Click here to see answer by Earlsdon(6294)

Question 93239: I am so lost, if anyone could please answer this one I'd really appreciate it: What is the domain of g(x) when
Click here to see answer by stanbon(75887)

Question 93238: I am so lost, if anyone could please answer this one I'd really appreciate it: What is the domain of g(x) when g(x)=(x+3)/(2x-5)}}
Click here to see answer by bucky(2189)

Question 93264: i have absolutely no idea what this means. can someone please help me with this question?: find the equation of the linear functions that has a slope of -3 and
Click here to see answer by ankor@dixie-net.com(22740)

Question 93489: Use slope and Y intercept to graph -3x+y=-6
Click here to see answer by checkley75(3666)

Question 93623: Find the slope and y-intercept for each line.
Y=-x+5

2. Sketch the graph of each equation.
-3x-y=2
Click here to see answer by checkley75(3666)

Question 93663: find the slope of the line through each pair of points A(1,1), B(6,3)
Click here to see answer by praseenakos@yahoo.com(507)

Question 93663: find the slope of the line through each pair of points A(1,1), B(6,3)
Click here to see answer by edjones(8007)

Question 93844:
Click here to see answer by Edwin McCravy(20054)

Question 94073: Identify the slope, m, and the y-intercept, b, for each line.
x + y = 6
Click here to see answer by praseenakos@yahoo.com(507)

Question 93978: When a cold yam is put into a hot oven to bake, the temp. of the yam rises. The rate, R,at which the temp. rises is governed by Newton's Law of Heating, which says that the rate is proportional to the temp. difference between the yam and the oven. If oven is 350 degrees and the yam is H degrees. Which can be used to model the temp. of the yam. Is it R=kh-350 or R=k(350-H) or R=k(H-350)?
Click here to see answer by bucky(2189)

Question 94344: For what real number(s) x does the expression represent a real number?
Square root of 4x+8
Click here to see answer by stanbon(75887)

Question 94345: A video game manufacturer is planning to market a 64-bit version of its game machine. The fixed costs are $570000 and the variable costs are $100 per machine. The wholesale price of the machine will be $120.
(a) How many game machines must be sold for the company to make a profit?
(b) How many game machines must be sold for the company to break even?
Click here to see answer by checkley71(8403)

Question 94593: Some bank robbers leave town speeding at 70mph. 10 mintues later police gave chase traveling at 78 mph. How long will it take the police to overtake the robbers?
Click here to see answer by checkley71(8403)

Question 94611: solve each formula for indicated variable
bx-cx=-c
Click here to see answer by stanbon(75887)

Question 94683: y varies directly as x. find the constant of variation and the direct-variation equation. y=750 when x=25.

Click here to see answer by stanbon(75887)

Question 95176: R(r1 + r2) = r1r2, for r2
Click here to see answer by checkley71(8403)

Question 95478: A man deposited $6800 into two accounts. One account earns interest at 8% and the other at 10.5%. The total interest for one year is $669. Find the amount deposited in each account.
Click here to see answer by stanbon(75887)

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