Questions on Algebra: Equations answered by real tutors!

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Question 452389: My grandaughter came home with six of these math problems (6th grade)....
Using the numbers (2,3,4,5,7,8,9) fill in the blanks.
_*_-_/_+_*_/_=3
Using brute force it took me (and four other ADULTS) several hours to answer all 6 questions....
Am I missing something here?? Is there some technique I am missing?
Click here to see answer by Alan3354(69443)

Question 452471: how do you solve t^2-8t+15=0

Click here to see answer by nerdybill(7384)

Question 452495: I'm in college. I don't understand how to get the variables.
Here is my problem
12x + 3 = 8x - 24
Can you show me step by step with no short cuts how to get this answer.
Click here to see answer by confusedgirl81(14)

Question 452594: write the complex expression in standard form
(1-i)(2+3i)
Click here to see answer by josmiceli(19441)

Question 452595: A
football is punted and has a hang time T of 4.6 seconds.
Use the formula T(h)=1/2square root of(h) to estimate the
height h that it was kicked to the nearest foot.
Click here to see answer by josmiceli(19441)

Question 452593: write the complex expression in standard form
(1-2i)+(-3+2i)

Click here to see answer by MathLover1(20849)

Question 452774: solve for pi:A=pi r^2
note:i am using (pi) being that I can not put the symbol in with a keyboard.
Click here to see answer by rfer(16322)

Question 452642: how do i solve 1-3x/x-4= 8/4-x
Click here to see answer by ankor@dixie-net.com(22740)

Question 452790: solve for pi:A/r^2
Click here to see answer by jim_thompson5910(35256)

Question 452796: 7(3x/1)=-1
i need to figure that out using distributive property
Click here to see answer by rfer(16322)

Question 452808: -8r-7=24.
Click here to see answer by jim_thompson5910(35256)

Question 453002: can someone help me by tuesday plss :(?
solve the equation for the specified variable.
solve R= 3V/h for h
Click here to see answer by mananth(16946)

Question 453073: find vertex of porabola y = 6 x + 7 - x^2
Click here to see answer by nerdybill(7384)

Question 453003: can someone help me by tuesday plss :(?
solve the equation for the specified variable.
solve I= E/R+r for E
Click here to see answer by ankor@dixie-net.com(22740)

Question 453000: can someone help me by tuesday plss :(?
solve the equation for the specified variable.
solve f= k/d-D for D
Click here to see answer by ankor@dixie-net.com(22740)

Question 453160: can you explain how multiplying or dividing a negative by a negative equals a positive
Click here to see answer by solver91311(24713)

Question 453202: How can I find the answer to -12r - 120= when r=8?
Click here to see answer by jim_thompson5910(35256)

Question 453209: what is the solution to 8x^2+23x-3
Click here to see answer by jim_thompson5910(35256)

Question 453213: 9x-7x+2x+8(6x+2x)
Click here to see answer by jim_thompson5910(35256)

Question 453215: Determine the vertex of the given equation. Parabolas.
y = -x2 + 5x - 6
Can you help me please!
Click here to see answer by MathLover1(20849)

Question 453243: 12(x-1)-3(x-1)
Click here to see answer by rfer(16322)

Question 453280: please help me.
Solve the system by the elimination method.
x + 2y= -15
5x +2y= -43
Click here to see answer by Alan3354(69443)

Question 453302: Please help me solve the equation
30d^2+33d+9=0

Click here to see answer by robertb(5830)

Question 453299: If 4x+6=2x+10 than what is x?
Click here to see answer by robertb(5830)

Question 453316: If -4x=4(x-8) than what is x?
Click here to see answer by robertb(5830)

Question 453356: write an equation which says that distance d equals the product of rate of travel r and time traveled t
Click here to see answer by rfer(16322)

Question 453079: y = 4 x^2 - 2 x - 3 find zeros
Click here to see answer by robertb(5830)

Question 453408: 6.2(x - 15.1) = 9.3(-x - 3.2)
Solve the following equations for the unknown
what does this mean?
Click here to see answer by rwm(914)

Question 453409: Find the area of a rectangle if three of its corners are (-0.1,-3.4), (-7.9,-3.4), and (-0.1,6.8). How would i do this?
Click here to see answer by rwm(914)

Question 453386: 2x^2-x-21=0... solve by factoring,completing the square, and the quadratic formula.
thanks in advance.
Click here to see answer by rwm(914)

Question 453378: a=be^rx solve for x. also the x is an exponent along with the r.
Click here to see answer by htmentor(1343)

Question 453443: Hello,
Appearently my question is not easy.
There are 2 options:
1. You are born with mathematical genes. Than my question isn't interesting.
2. You are not born that way. (Like me).
In that case you have a problem, because the people who could help (option 1 above), are not really interested. (Even many teachers are not focussing on my type of question at all).
I hope you will find the right words to help.
My problem is that I need some good examples of practical use, before I can learn equations, how to solve them. I just don't see the need.
If you often have practical profit of the knowledge to solve equations than you are the one I'm looking for...!
The reason why I want to know this, is that somebody ever told me, that mathematics are a sort of geography in math-land. When you know the rules than you can go from a to b easily. In other words: You can find impossible (..) solutions for real math problems, when you know when to use it.
So, I like to be able to travel. But only with knowledge of the possible roads able to choose the best.
Thanks for your efforts in advance,
Huub.

Click here to see answer by stanbon(75887)

Question 453492: How do I solve -5(t+5)=5
Click here to see answer by rwm(914)

Question 453509: Graph the following equations; calculate the slope, x-intercept, and y-intercept, and label the intercepts on the graph.
4.2x + 3.8y = 1.9
Click here to see answer by Alan3354(69443)

Question 453455: 5t+17=27+8t
Click here to see answer by edjones(8007)

Question 453548: Can you please help me figure out what the coordinates of the roots of 2x2 - 8 = 0 are?
Click here to see answer by stanbon(75887)

Question 453233: Please help me out with this problem, I'm really struggling with it. I'm not so good at working with percents so I really need HELP. Please help me as soon as any of the tutors get this email. Can you also show all of the work and steps involved in getting the answer to the problem? Thank you so much! I really appreciate it!
Question:
A farmer grew a watermelon that weighed 20 lb. From his experience with growing watermelons, he estimated that 95% of the watermelon's weight is water.
a. How much of the watermelon is water?
b. How much of the watermelon is NOT water?
c. The watermelon was shipped off tot he market, where it sat until it dehydrated (lost water). If the watermelon is still 90% water, what percent is not water?
Please help me out. The question has three parts to it so please please take the time to show the work and steps to each answer. Thank you so much! :D :)
Click here to see answer by ankor@dixie-net.com(22740)

Question 453551: How do I determine the graph of the quadratic equation y = -10x2 + 9. Can you please help me?
Click here to see answer by stanbon(75887)

Question 453376: i wasn't sure what to put this under but my question is:
3^x=2 and you need to solve for x. thanks in advance
Click here to see answer by ankor@dixie-net.com(22740)

Question 453570: Which of the following are the coordinates of the roots of -3x2 + 9x = 0?
Do you think you could help me please?
Click here to see answer by solver91311(24713)

Question 453560: I dont understand how to plug it into the formula, please help.
A basketball was thrown from one end of a court to the other. It had an initial upward velocity of 48 feet per second. How long did it take for the ball to hit the ground? Use the formula h = vt � 16t2.
Click here to see answer by edjones(8007)

Question 453652: 2b+5/2-3(b+2)=4 solve?
Click here to see answer by Alan3354(69443)

Question 453708: Can someone help me simplify this problem?
∛216
Click here to see answer by edjones(8007)

Question 453708: Can someone help me simplify this problem?
∛216
Click here to see answer by rfer(16322)

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23941..23985, 23986..24030, 24031..24075, 24076..24120, 24121..24165, 24166..24210, 24211..24255, 24256..24300, 24301..24345, 24346..24390, 24391..24435, 24436..24480, 24481..24525, 24526..24570, 24571..24615, 24616..24660, 24661..24705, 24706..24750, 24751..24795, 24796..24840, 24841..24885, 24886..24930, 24931..24975, 24976..25020, 25021..25065, 25066..25110, 25111..25155, 25156..25200, 25201..25245, 25246..25290, 25291..25335, 25336..25380, 25381..25425, 25426..25470, 25471..25515, 25516..25560, 25561..25605, 25606..25650, 25651..25695, 25696..25740, 25741..25785, 25786..25830, 25831..25875, 25876..25920, 25921..25965, 25966..26010, 26011..26055, 26056..26100, 26101..26145, 26146..26190, 26191..26235, 26236..26280, 26281..26325, 26326..26370, 26371..26415, 26416..26460, 26461..26505, 26506..26550, 26551..26595, 26596..26640, 26641..26685, 26686..26730, 26731..26775, 26776..26820, 26821..26865, 26866..26910, 26911..26955, 26956..27000, 27001..27045, 27046..27090, 27091..27135, 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36721..36765, 36766..36810, 36811..36855, 36856..36900, 36901..36945, 36946..36990, 36991..37035, 37036..37080, 37081..37125, 37126..37170, 37171..37215, 37216..37260, 37261..37305, 37306..37350, 37351..37395, 37396..37440, 37441..37485, 37486..37530, 37531..37575, 37576..37620, 37621..37665, 37666..37710, 37711..37755, 37756..37800, 37801..37845, 37846..37890, 37891..37935, 37936..37980, 37981..38025, 38026..38070, 38071..38115, 38116..38160, 38161..38205, 38206..38250, 38251..38295, 38296..38340, 38341..38385, 38386..38430, 38431..38475, 38476..38520, 38521..38565, 38566..38610, 38611..38655, 38656..38700, 38701..38745, 38746..38790, 38791..38835, 38836..38880, 38881..38925, 38926..38970, 38971..39015, 39016..39060, 39061..39105, 39106..39150, 39151..39195, 39196..39240, 39241..39285, 39286..39330, 39331..39375, 39376..39420, 39421..39465, 39466..39510, 39511..39555, 39556..39600, 39601..39645, 39646..39690, 39691..39735, 39736..39780, 39781..39825, 39826..39870, 39871..39915, 39916..39960, 39961..40005, 40006..40050, 40051..40095, 40096..40140, 40141..40185, 40186..40230, 40231..40275, 40276..40320, 40321..40365, 40366..40410, 40411..40455, 40456..40500, 40501..40545, 40546..40590, 40591..40635, 40636..40680, 40681..40725, 40726..40770, 40771..40815, 40816..40860, 40861..40905, 40906..40950, 40951..40995, 40996..41040, 41041..41085, 41086..41130, 41131..41175, 41176..41220, 41221..41265, 41266..41310, 41311..41355, 41356..41400, 41401..41445, 41446..41490, 41491..41535, 41536..41580