Tutors Answer Your Questions about Linear Algebra (FREE)
Question 77064: Sorry not sure what kind of algebra it is.
the question is from nov03 edexcel gcse paper, and tells us the area of a trapezium is 36cm^2
show that x^2-x-56=56, which i got to be,
1/2(a+b)h
=1/2(x+2+x+6)x-5
1/2(2x+8)x-5=36
x+4 multiplied by x-5
36 =x^2-20+4x-5
therefore x^2-x-56=0
is that right?
and then it asks you to solve the equation x^2-x-56=0
i've got so far
x^2-x=56
x^2=56+x
but i never know what to do next? please help!
Click here to see answer by jim_thompson5910(35256)  |
Question 80816: This is a question from a class homework assignment.
Given a line containing the points (1,3), (2,4), (3,5) determine the slope-intercept form of the equation, give one additional point on this line and graph function.
Equation of line in slope-intercept form:
show your work:
Give one additional point in (x,y) form that would fall on this line:
Graph the function:
Click here to see answer by funmath(2933) |
Question 81532: Can you please help me do this problem. I really just don't know where to start.It is solutions to linear systems using matrices.
12x-4y-7z=8
-8x-6y+9z=7
34x+6y-2z=5
Can you show me how to do it step by step please. Thank you for your time
Click here to see answer by longjonsilver(2297)  |
Question 81532: Can you please help me do this problem. I really just don't know where to start.It is solutions to linear systems using matrices.
12x-4y-7z=8
-8x-6y+9z=7
34x+6y-2z=5
Can you show me how to do it step by step please. Thank you for your time
Click here to see answer by Edwin McCravy(20055)  |
Question 81532: Can you please help me do this problem. I really just don't know where to start.It is solutions to linear systems using matrices.
12x-4y-7z=8
-8x-6y+9z=7
34x+6y-2z=5
Can you show me how to do it step by step please. Thank you for your time
Click here to see answer by rapaljer(4671)  |
Question 82374: This summer there were 867 campers at a basketball camp. Most of the campers wore "Air Jordan" shoes, but some wore "Ground McCombs" shoes. A pair of Air Jordans cost $160.95 at Finish Line. A pair of Ground McCombs cost $14.25 at Wal-Mart. The campers spent a total of $127,220.85 on shoes. How many campers wore Ground McCombs shoes?
Click here to see answer by askmemath(368) |
Question 82372: Beavis and Butthead steal their neighbor's riding lawnmower and drive away at a constant speed of 15 miles per hour. Five minutes later, their neighbor jumps onto Butthead's skateboard and chases after them at a constant speed of 20 miles per hour. Find the neighbor's travel time needed to catch Beavis and Butthead. Give your final answer in hours.
Click here to see answer by askmemath(368) |
Question 82786: Can someone help me with the following problem?
An open-top box is to be constructed from a 6 foot by 8 foot rectangular cardboard by cutting out equal squares at each corner and folding up the flaps. Let x denote the length of each side of the square to be cut out.
a)Find the function V that represents the volume of the box in terms of x.
b)Graph this function and show the graph over the valid range of the variable x.
c)Using the graph, what is the value of x that will produce the maximum volume?
Thank you so much for your assistance...
Click here to see answer by ankor@dixie-net.com(22740)  |
Question 83425: Please help me solve this:
For a fixed rate, a fixed principal amount and a fixed compounding cycle, the return is an exponential function of time. Using a formula, let r = 10%, P = 1 and n = 1 and give the coordinates (t,A) for the points where t = 0,1,2,3,4. Round your answer to the nearest tenth's place.
Click here to see answer by jim_thompson5910(35256) |
Question 83425: Please help me solve this:
For a fixed rate, a fixed principal amount and a fixed compounding cycle, the return is an exponential function of time. Using a formula, let r = 10%, P = 1 and n = 1 and give the coordinates (t,A) for the points where t = 0,1,2,3,4. Round your answer to the nearest tenth's place.
Click here to see answer by stanbon(75887) |
Question 83564: The question is: Almonds worth $8.75/lb mixed with peanuts worth 4.75/lb take how many pounds of each to make an 80lb mixture worth $6.50/lb?
I have tried solving by addition with 8.75a + 4.75p = 80(6.50) or $520 by mutiplying a+b=80 by -4.75 to eliminate the peanuts.The result I get is 4.75a=$520-$380 or $140. $140/4.75 is 29.47 for almonds which is wrong. I have the correct answer and my calculation doesn't match the answer and I don't know what I'm doing wrong. I need to know the right way to get to 45lbs of almonds and 35 lbs of peanuts.
This is not from a textbook but a final review.
Thank you very much
Click here to see answer by jim_thompson5910(35256) |
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Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935, 1936..1980, 1981..2025, 2026..2070, 2071..2115, 2116..2160, 2161..2205, 2206..2250, 2251..2295, 2296..2340, 2341..2385, 2386..2430, 2431..2475, 2476..2520, 2521..2565, 2566..2610, 2611..2655, 2656..2700, 2701..2745, 2746..2790, 2791..2835, 2836..2880, 2881..2925, 2926..2970, 2971..3015, 3016..3060, 3061..3105, 3106..3150, 3151..3195, 3196..3240, 3241..3285, 3286..3330, 3331..3375, 3376..3420, 3421..3465, 3466..3510, 3511..3555, 3556..3600, 3601..3645, 3646..3690, 3691..3735, 3736..3780, 3781..3825, 3826..3870, 3871..3915, 3916..3960, 3961..4005, 4006..4050, 4051..4095, 4096..4140, 4141..4185, 4186..4230, 4231..4275, 4276..4320, 4321..4365, 4366..4410, 4411..4455, 4456..4500, 4501..4545, 4546..4590, 4591..4635, 4636..4680, 4681..4725, 4726..4770, 4771..4815, 4816..4860, 4861..4905, 4906..4950, 4951..4995, 4996..5040, 5041..5085, 5086..5130, 5131..5175, 5176..5220, 5221..5265, 5266..5310, 5311..5355, 5356..5400, 5401..5445, 5446..5490, 5491..5535, 5536..5580, 5581..5625, 5626..5670, 5671..5715, 5716..5760
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