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

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Question 643881: I have done 7/10 of my homework. I will submit each one separately.
The answers are randomized on the back, but it seems as if they aren't correct.
#6. The total surface area of a can is 188.4 in squared. If the radius of the can is 3 inches. what is the height of the can?
I tried, s=2 times pi times 3 times height plus 2 times pi times 3 ^2
Click here to see answer by MathTherapy(1424)

Question 644431: 3(x-4)-4(x-3)=x+3-(x-2)
Click here to see answer by nerdybill(6959)

Question 644582: -4p+3q=-6 find q
Click here to see answer by stanbon(57352)

Question 644646: The question states: Find an equation for the line.
4. through (-8,8) and parallel to y = 3/2x -3. I have a test on tuesday and cant figure out the steps to work this problem out. Can you please help me.
5. through (-3,8) and vertical
6. through (-7,5) and perpendicular to y=2/3x -2
Can someone walk me through the steps in solving these questions. Thanks
Click here to see answer by nerdybill(6959)

Question 644709: I cannot figure out how to set this question up, so please help!
A machine that originally cost $15,600 has a value of $7,500 at the end of 3 years. The same machine has a value of $2,800 at the end of 8 years.
a. Find the average rate of change in value (depreciation) of the machine between its purchase and the end of 3 years.
Please help if you can! Thank you.
Click here to see answer by stanbon(57352)

Question 645565: Hi, I wanted to check my answer to this problem.
Use the limit definition to find the following derivatives.
1) f(x) = 3x^2
For this problem I got f'(x)=6x. Is this correct?
2) h(x) = x^3
This problem, I couldn't get. I think you have to multiply x^2+2xh+h^2(x+h). Is this right.

Your help is appreciated. Thanks!
Click here to see answer by ewatrrr(10682)

Question 646235: What is the slope of a binomal 3x+5
Click here to see answer by stanbon(57352)

Question 646308: is this linear or not linear?
y=-2x
--
3
Click here to see answer by solver91311(16885)

Question 646456: y+2= -(x-1) point slope form
Click here to see answer by MathLover1(6634)

Question 646934: My directions are: Solve the linear system. And i am given the two equations:
2c - d = -2 and
4c + d = 20.
I dont know what to do! can you please explain it and help? thank youuuu!
Click here to see answer by stanbon(57352)

Question 647326: 12x=4y+28
Click here to see answer by MathLover1(6634)

Question 647444: 4x-2=7x+7
Slove
Click here to see answer by jim_thompson5910(28595)

Question 647946: Find the value of x and YZ if Y is between X and Z.
XY=12, YZ=2x, And XZ=28
Click here to see answer by fcabanski(874)

Question 648780: Find the equation of a line in slope-intercept from that passes through the points (6,5) and (4,1).
I don't want just the answer, I would like to actually learn how to work this out myself. Just need help and steps to do so.
Click here to see answer by rfer(12660)

Question 649556: y=5x+6 graph
Click here to see answer by MathLover1(6634)

Question 649598: How to solve this equation 3-5x+2x=-2-2(1-x)
Click here to see answer by sheldonbbtrocks(53)

Question 649598: How to solve this equation 3-5x+2x=-2-2(1-x)
Click here to see answer by MathLover1(6634)

Question 650162: find each value if f(x)=3x+2 and the promblem is f(-5)
Click here to see answer by ewatrrr(10682)

Question 650765: What are all intercepts to x^2+y=18^2?
Click here to see answer by MathLover1(6634)

Question 651090: Find the distance from the point (3,5,-4) to the line that passes through the points (5,2,7) and (-3,6,4). Also what point on that line is closest to the point (3,5,-4)
Click here to see answer by Edwin McCravy(8909)

Question 651732: For the function f(t)=(2t+3)/(5) Solve f(t) = 2.
Click here to see answer by stanbon(57352)

Question 651771: Select ALL calculations that are measured in square units.
Answer

The amount of fencing needed to surround a garden

The amount of carpet needed to cover a floor

The amount of sod needed to cover a dirt yard

The amount of base boards (molding) needed for a room

The amount of water needed to fill a bucket

The amount of paint needed to cover a wall

Click here to see answer by MathLover1(6634)

Question 651770: Select ALL calculations that are measured in linear units.
Answer

The amount of fencing needed to surround a garden

The amount of carpet needed to cover a floor

The amount of sod needed to cover a dirt yard

The amount of base boards (molding) needed for a room

The amount of water needed to fill a bucket

The amount of paint needed to cover a wall
Click here to see answer by jim_thompson5910(28595)

Question 652262: x+2y=200
x=y+50
Click here to see answer by Shana-D77(122)

Question 652888: xy+3x=25;x=5
Click here to see answer by Aaniya(63)

Question 652969: I need to graph and solve each system
8x-3y=-3
4x-2y=-4
Click here to see answer by MathLover1(6634)

Question 653117: S = n(a + l)/2 solve for l
The first thing I did was use distributive property for n(a + l). So then:
S = (na + nl)/2
Then, I thought about trying to cancel out the 2, leaving it as:
2S = 2na + 2nl
Am I on the right track?
Click here to see answer by Edwin McCravy(8909)

Question 653538: In slope-intercept form. Write an equation. Passes through (2,5) parrallel to the graph 2x+3y=6
Click here to see answer by schmidtmomto6(24)

Question 653239: determine whether the following functions are linear transformations. justify your answer.
a)T:M22 -> M23 where B is a fixed 2*3 matrix and T(A)= AB
Note: M22 is a matrix of 2 by 2 and M23 is a matrix of 2 by 3
b)F:Mmn->Mmn where F(A)=AT
NOTE: Mmn denotes matrix of m by n
Click here to see answer by 9003105888080(1)

Question 655272: Find the difference quotient
F(x)= 5x - x^2
F(5 +h) - f(5)
Click here to see answer by nerdybill(6959)

Question 656775: Calculate the distance between the pointsD=(-4,5) and K=(5,9) in the Cartesian plane.
Write the exact answer in radical form.

Click here to see answer by solver91311(16885)

Question 656962: graph each inequality: x + y > -5
Click here to see answer by MathLover1(6634)

Question 656996: how can you tell if this equation is linear? 2y=2x-1 over 4
Click here to see answer by solver91311(16885)

Question 656996: how can you tell if this equation is linear? 2y=2x-1 over 4
Click here to see answer by stanbon(57352)

Question 656996: how can you tell if this equation is linear? 2y=2x-1 over 4
Click here to see answer by Amar Price(1)

Question 657284: Slope= -1; through (3,5)
(-4,10) and (-6,15)
Y= -3/5x + 3
X- 4y = -4
I need help with trying to solve these four problems
Click here to see answer by stanbon(57352)

Question 657512: How do you find a slope of a line through (-1, 3) and (-3, 7)
Click here to see answer by colliefan(239)

Question 657567: Determine whether y varies directly with x in the equation . If so, what is the constant of variation?
A. yes; k = 3
B. yes; k = 6
C. yes; k = 3(x 1)
D. no
Click here to see answer by rfer(12660)

Question 657944: how can i find the value of y?
4^2y + 4^(2y-1) = 4
Click here to see answer by Alan3354(30993)

Question 657944: how can i find the value of y?
4^2y + 4^(2y-1) = 4
Click here to see answer by Edwin McCravy(8909)

Question 657944: how can i find the value of y?
4^2y + 4^(2y-1) = 4
Click here to see answer by MathLover1(6634)

Question 657950: 5x-7y=6. For y.
Click here to see answer by lenny460(770)

Question 658189: slope -3; through (1,-4)
what iv tryed is
y+4=-3[x-(1)]
y+4=-3(x-1)
when i checked in the back of the book it was wrong

Click here to see answer by Alan3354(30993)

Question 658189: slope -3; through (1,-4)
what iv tryed is
y+4=-3[x-(1)]
y+4=-3(x-1)
when i checked in the back of the book it was wrong

Click here to see answer by jim_thompson5910(28595)

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