Tutors Answer Your Questions about Complex Numbers (FREE)
Question 165401: Below are the equations that I need assistance with...
1. 2x+y-3z=-4
2. 4x-2y+z=9
3. 3x+5y-3z=5
Below are the instructions to solving the problems. I am supposed to solve for x, y, and z. The answer should be the same for x, y, and z in all three equations. For instance, if x is 2, y is 5, and z is 3 in problem #1, the answer should be the same for the last two problems. My professor explained this to me, but when I tried to solve it, I did not receive the correct answer. Please help me. I would really appreciate it. I need this answer for my class as soon as possible...
1.Choose two of the three equations so that one of the variables is eliminated (use addition method).
2.Repeat step one with two different equations to eliminate the same variable.
3.Use the equation resulting from steps 1 & 2 to solve for one of the variables.
4.Substitute the variable in step 3 into equation to solve for a second variable.
5.Substitute the values from steps 3&4 into equations 1, 2, or 3 to solve for the final variable.
Click here to see answer by Alan3354(30993)   |
Question 165510: The shape of a supporting arch can be modeled by h(x)=-0.03x^2+3x, where h(x) represents the height of the arch and x represents the horizontal distance from one end of the base of the arch in meters. Find the maximum height of the arch. Show work.
Thanks
Click here to see answer by ankor@dixie-net.com(15656)  |
Question 165734: I'm not sure if this is the right section, but I really need help.
Find: p(-3) if p(x)=x^5+3x^2
What I did was put -3 in for all x's and came up with the answer of 270.
I'm not sure if I did this right. Can you please help. If it's not right will you please show me what I did worng.
Thanks
Click here to see answer by ptaylor(2048)  |
Question 165756: An NFL kicker attempts a 41-yard field goal. The path of the football toward the uprights can be represented by the graph of the quadratic function f(x)= -.0625x²+2.7x, where x is the horizontal distance the football travels in yards and f(x) is the vertical distance the football travels. The bottom of the upright is 3.5 yards above the ground.
Assuming the kick is in between the uprights, did the kicker make the field goal? Why or Why not?
Click here to see answer by ankor@dixie-net.com(15656) |
Question 166065: can someone please help me with this:
Solve the problem.
If the average cost per unit C(x) to produce x units of plywood is given by:
C(x) = 900 / x+30
What do 600 units cost? Round your answer to the nearest cent.
a. $857.14
b. $899.95
c. $180.00
d. $18,000.00
Click here to see answer by oscargut(891)  |
Question 166180: I'm not sure if this is the right section, but I will still ask.
1. Use synthetic division to find f(-3) for f(x)2x^3-6x^2-5x+7.
2. One factor of f(x)=x^3+x^2-22x-40 is x+4. Find the other factors.
I must show my work and have no textbook to explain. Will you PLEASE HELP!!!!
Thanks
Click here to see answer by Fombitz(13828)  |
Question 166032: can someone help me with this problem:
Solve the problem.
If the average cost per unit C(x) to produce x units of plywood is given by:
C(x) = 900 / x+30
What do 600 units cost? Round your answer to the nearest cent.
a. $857.14
b. $899.95
c. $180.00
d. $18,000.00
Click here to see answer by ankor@dixie-net.com(15656) |
Question 167397: I'm not sure if this is the right section, but will someone please help me.
Find the exact solutions of the system of equations x^2+2y^2=18 and x=2y.
I have to show all my work and I don't know how to do this.
PLEASE HELP!!!!
Thanks
Click here to see answer by Fombitz(13828) |
Question 167397: I'm not sure if this is the right section, but will someone please help me.
Find the exact solutions of the system of equations x^2+2y^2=18 and x=2y.
I have to show all my work and I don't know how to do this.
PLEASE HELP!!!!
Thanks
Click here to see answer by gonzo(654) |
Question 167782: This is another question from a past Algebra & Complex Numbers paper which I am practicing for study for my Calculus exam. The question is apparently worth an excellence mark:
QUESTION EIGHT
Find the equation of the locus of the point representing z if |z-3i|-|z+3i|=2.
I can work it out as far as:
|z-3i|-|z+3i|=2
(z=x+iy) => |x+i(y-3)|-|x+i(y+3)|=2
(|z|= ) =>  - =2
 - =2
but after that I get stuck.
Help appreciated.
Click here to see answer by oscargut(891) |
Question 168106: i am struggling with solving complex equations for x and y:
such as 3(x+jy)=9-j27
this if for an electrical degree course, quantitative analysis assignment.
Hopeing someone can explain so i can solve the rest of the problems as course is very fast meaning things are being brushed over very fast and it is an awful long time since i done anything of this level.
Regards
Kevin
Click here to see answer by oscargut(891) |
Question 168321: Any help with the folllowing assignment question would be most appreciated. I am doing an electrical degree course which is moving too fast over the quantitative analysis section and I am struggling to take basics for each topic.
two coils connected in parrallel
r1= 12 ohm L1= 24mH
r2= 6 ohm L2=30mH
given that f = 50Hz calculate the values of impedance for each coil Z1 and Z2 and the total impednace for two impedances in parrallel in both polar form and rectilinear form.
thanks
Kevin
Click here to see answer by Alan3354(30993) |
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