# I don't understand how to do this problems: Solve for the variable r, C=2PIr (PI is the pi symbol thing then r is next to it) and this problem solve for the variable l, S=B+1/2Pl I know this is the

63,568 results
1. ## Math

I am taking the Using Tables, Rules, and Graphs quiz part 2, and I dont understand these two problems. 1. Use the function rule to complete the table: -10x+y=y Above it shows a graph, with x and y marked, then along the top it goes -2, -1, 0, 1, 2 I don't

2. ## Substitution Method-Plz help

Use the Substitution method to solve the system of equations. x + y = -4 x - y = 2 solve for x in the second equation. x= y+2 Put that in for x in the first equation: x+y=-4 (y+2) + y = -4 solve for y. Then, x= y+2 i don't get it.How did you get that?What

3. ## Math

Solve the indefinite integral of 1/sqrt(x^2+2x+5). I solved it all out by completing the square and then trig sub and then drawing a triangle to go back to x variable and got: ln |(sqrt(x^2+2x+5)/2 + (X+1)/2 ) | but the book answer is: ln |(sqrt(x^2+2x+5)

4. ## Calculus

A rectangle is bounded by the x-axis and the semicircle y = sqrt(36-x^2). What length and width should the rectangle have so that its area is a maximum? I understand that 2xy = A and that 4x + 2y = P, but I'm not sure how to solve for a variable to plug

5. ## Math

if f(x) = 2x^2+4 and g(x)=x-3 which number satisfies f(x)= (f o g)(x) A) 3/2 B) 3/4 C) 5 D) 4 I am positive that answer A is correct, i just cant get the work to prove it, i can disprove all other answers and my teacher has assured me i am on the right

6. ## Algebra

If 3 is subtracted from the numerator of a certain fraction, the value becomes 2/3. If 10 is added to the denominator of the original fraction, the value becomes 1/2. Find the original fraction. Solve the problems by using 2 variables HOW DO I START THIS

7. ## GENERAL CHEMISTRY

CALCULATE THE pH AND HYDROLYSIS IN 0.10 M AlCl3 SOLUTION.Ka = 1.2 X 10-5 FOR [Al(OH2)6]+3,OFTEN ABBREVIATED Al+3.TELL WHETHER pH IS ACID OR BASE.GIVE IONIC EQUATION. Help us a little by telling us how much you know to do and exactly what you don't

8. ## calc

the volume of a cylindrical tin can with a top and a bottom is to be 16*pi cubic inces. if a minimum amont of tin is to be used to construct the can, what must be the height, in inches, of the can? volume of cyliner is pi*r^2*h do i like take derivitive of

9. ## Math

M is the set of integers that are greater than -1 and less than 4 I don't understand?? i know it's easy but i don't understand how to solve it

10. ## Chemistry

radioactive sodium chloride is appropriate for diagnosing circulatory problems, but radioactive xenon is helpful in searching for lung problems. Explain why. I understand different elements are used for specific parts of the body but I don't understand

11. ## Math

If n+1 is the largest of four consecutuve integers, represent the sum of four integers. A 4n+10 B 4n-2 C 4n-4 D 4n-5 E 4n-8 I really don`t understand this question so I can`t provide my work. Can someone please explain to me how to solve these types of

12. ## English

I'm worried about my math. 1. Why don't you buy a math self- teaching book and solve math problems a lot. 2. Why don't you buy a math self-study book and solve math problems a lot. 3. Why don't you go to a math academy and study math more? 4. Why don't ask

13. ## Algebra

Solve each literal equations for the indicated variable D = C - s/n ( for s) s/n = D - C Next, multiply both sides of the above equation by n, to get the equation for s. i don't understand could you type it how it looks This is an example Tammy If you have

14. ## Chem 1120

The KC for the reaction I2 --> 2I is 3.8 x 10 ^ -5 at 727 degrees C. Calculate Kc and Kp for the equilibrium of 2I -> I2 at the same conditions. I don't understand how to set up or solve this problem. I know Kc=[I]^2 / [I2] = 3.8x10^-5 for the first

15. ## Algebra

How to solve inequality with variable on both sides. With n+7≤3n−1 as an example (the question I am trying to solve) I ask that someone provide a step by step example of how to solve this, I've made multiple attempts and It always ends up botched. I

16. ## Algebra

Jesse Played two days of golf. On the second day, he got a score of six bellow par, or -6. His total score for the two days was o above par, or 0. Define a variable. Then write and solve an equation to find the score Jesse got on the first day. Show your

17. ## Trigonometry

Express each of the following as a single logarithmic expression. All exponents must be left in radical form: 1.) 2logx-3logy 2.) logx-logy+logz 3.) 1/3log5x+2/3log6x 4.) 2/3(logbase2 x - logbase2 y) I don't understand these problems at all. Can someone

Please help me! I don't understand how to solve. Solve each equation for the given variable. 37. x/a - 1 = y/b for x 39. V = 1/3 * pi * r^2 * h for h What do these equations mean? I am super confused. Please help.

19. ## math

solve equation then check for extraneous solution please someone explain this to me. 6/6-4x/=8+4 then one that is solve the inequality s/x+3/4

20. ## algebra

I don't understand how to do these problems, anyone that can help id appreciate it thank you. Solve each system by substitutions solving for x then for y x=5 3x+y=2 x+y= 8 4x+y=20

21. ## science

what is the following answers for the definitions i don't understand; control, repetition, validity, reliability, accuracy, controlled variable, independent and dependent variable, hypothesis? We'll be happy to help you understand these definitions if you

25. ## Math

Solve each literal equation for the indicated variable 2x-3y=4 for x The answer is suppose to be x=3/2y+2 I don't understand how you do this problem?

26. ## calculus

solve the differential equation. assume a, b and k are non zero constants. dR/dt = kR i don't understand how to do these problems.

27. ## To Troyer 0269

I deleted your last science post, as I promised I would a couple of weeks ago. You posted five questions that I'm sure you could answer by reading your text. As you know, we don't give answers, but help students with problems they don't understand. If you

28. ## Physics Word Problems

Could you please explain to me these problems, I don't understand them. Do 100 J of work in 50 s and your power output is? - I got 2, but not sure of the units. A bow is drawn so that it has 40 J of potential energy. When fired, the arrow will ideally have

29. ## Algebra II

I need some help with some problems as well as need some checked. Could you please help me? Thanks! 1. How do you graph y=1/x 2. How do I the x and y intecepts using a graph? Solve and check the linear equation. 9. (-4x-2)+7=-3(x+3) I got 14 10.

30. ## Graphs

x + 2y = -4 How do I graph this?can you please help? Assign values to x and solve for y or assign values to y and solve for x. Makre a table. X........Y 0........-2 2........-3 etc. I almost always assign a value of zero to Y, too, and calculate X. Y = 0;

31. ## Math

What is the difference between an equation and an expression? Include an example of each. Can you solve for a variable in an expression? Explain. Can you solve for a variable in an equation? Explain. Write a mathematical phrase or sentence for your

32. ## why is noone answering my question?!?!

A rational function that passes through (0,0) and (4, 8/7) has the x-axis as a horiztonal asympotote. It also has 2 vertical asymptotes x=3, x=-3. I understand that to set it up, it is y= ax+b / (x+3)(x-3). I don't understand how to solve for a and b. Put

33. ## math

how would you solve for y in this problem: x=(y^2+3y)^(1/3) I got: y= x^3/y - 3 ? and for this problem: x= 1/[(y^2+3y-5)^3] I got: y = y/x + 5/y - 3? However, I do not know how to solve for y explicitly. I don't think quadratic formula would work in these

34. ## Algebra again

I don't understand how to do this problems: Solve for the variable r, C=2PIr (PI is the pi symbol thing then r is next to it) and this problem solve for the variable l, S=B+1/2Pl I know this is the same question, but I somewhat understand how to get the

35. ## Math

I have some problems that I don't understand. Please help me. Solve the formula for the specified variable. s=2ðrh + 2ðr^2 for h f= (9/5)c+32 for c A=P(1+nr) for r for H i don't know what that notation is so I'll leave that alone and maybe someone else

36. ## Pre-Algebra

Can someone please show me how to solve these problems step-by-step so that I can understand how to do them? 1.Use inverse operations to write a related inequality and solve for the variable: d/6 < 12 2.Use inverse operations to solve the inequality:

37. ## Math

How do you solve second order initial value problems? I don't understand how would solve these questions..for example (d^2 y)/(dx^2 )=24x^2-10. When x=1, dy/dx = 3, and y = 5. Can anyone explain how?

38. ## Algebra

I've been struggling with algebra since I started and don't understand hardly any of it and I have this problem 9xy (2/3x)^3=( a0/ ' ^a0/)x^4y I really need help I have several problems like this and don't know what to do someone please explain how I solve

39. ## social studies

i am studying about palestinia and israel i have to write 8 bullets notes on what are the problems of the palestians and israel in the middle east. I don't understand the problems going on over there is there a website for my age 12 to understand this

40. ## algebra

solve the equation for the indicated variable 6k + 8m = 20; m i don't understand! help asap

41. ## math

can someone show me how to do these problems? Please? I really don't know how to answer them. I would really appreciate it... Solve the following formula for the variable indicated 9. r = d/t, where r = rate, d = distance, and t = time for d 10. 3x - y =

42. ## math

can someone show me how to do these problems? Please? I really don't know how to answer them. I would really appreciate it... Solve the following formula for the variable indicated 9. r = d/t, where r = rate, d = distance, and t = time for d 10. 3x - y =

43. ## Math

I'm having problems solving for an equation with a single variant. example: 3x + y + 3 Please show work so I can fully understand Thanks I don't understand your question, you don't have an equation. I have to graph 3x + y = 3, so I was trying to solve it

44. ## Math 115

I need help with these problems 1. 18kg=______g I don't understand this. 2.1kg=______oz. can't figure this out. 3.20lb=______oz can't figure this out. 4.461mm=______m don't know where to begin. Can some please help me understand these problems.

45. ## Algebra

Solve Q= (N-S)/ N for N So when I multiply both sides by N I get Q(N)= N-S I know I am doing something wrong, the answer is in the book which is N=S/(1-Q)but I don't understand were the 1 comes from. Could you write it out step by step, so I can see what I

46. ## calculus

When you are decomposing fractions into constants EX: 1/(x-1)(x-2)^2 = A/(x-1) + B/(x-2) + C/(x-2)^2 Why do you have to repeat (x-2), instead of just putting B/(x-2)^2? I know how to solve these types of problems, but I don't understand it conceptually.

47. ## Algebra problems

I have some problems that I would like checked please. Find and simplify the difference quotient f(x+h)-f(x)/h, h can not equal 0 for the given functions. 1. f(x)=x^2+3x+9- I got 2x+h+3 Evaluate the piecewise function at the given value of the independent

48. ## mathematics

I don't understand how to solve the follow types of problems with exponets and fractions. If you explain with the examples provided that would be nice. Ex. 1 4^-6 over 10 Ex. 2 6 over 9^-3

49. ## Math

Match the expressions with thier equivalent equations in the columns. List A: List B: 6x+12 6(1+x) 6+6x 6x-6 6(x-1) 6(x+2) Fill in the blank: The expression 6x+12 is equivalent to the expression __________ The expression 6+6x is equivalent to the

50. ## Math

I am having problems understanding how to solve problems like the following: a2 + b2 = c2 Please help me where I can understand solving problems such as the one above.

51. ## science

the quetion says "f the half life of Americium-241 is 433 years, &your sample size is 80 grams, how much will remain after 1,732 years?" i don't quite understand how to solve this problem... PLEAS HELP. SOS (gotta test 2morrow, and don't really know how to

52. ## Algebra2(check part 1)

1)Solve the matrix:[2x] [14]for x [3y]=[12] answer=7 2)V[3 1] [0 2] [-4 5].The dimensions of matrix V. answer=3x2 3)The first row of T+U T[4 -5 2] U[-9 6 4] [8 -1 3] [-5 -2 3] answer=[-5 1 6] 4)The first row of V-T. V[3 1] T[4 -5 2] [0 2] [8 -1 3] [-4 5]

53. ## Math

I understand problems like this but with just a variable in the first one. Here, it has 12. This throws me off. factor 12m^2 + 25m + 12 = 0.

54. ## calculus

Can someone help me understand how to find the derivative of these two problems: (t^2-1/t^2+2)^3=y and y=sin^32x? I think with the first one, I could just foil it maybe and cancel but I don't know what to do with the ^3...and then the second one I haven't

55. ## Algebra

Hey! I like math,but this year I'm doing algebra 1 and am not doing so well. I understand the lessons,but then the next day I learn a new way to solve a different problem and confuse the old way with this new way. So on tests,I know how to answer some

56. ## Calculus

Let h(x)= x^3 + 4x -2. Let g(x) represent the inverse of h(x). Find g(14). I know that if (a, f(a)) is on h(x), then (f(a), a) will be on g(x). I also know that if f^-1(a)=b if f(b)=a. I thought that if I could find the x value(s) at which h(x)=14, I would

57. ## Pre Algebra

Please help me with some problems. Thank you! Solve the equation by square root property. 3. 2x^2 = 26 I don't understand how to solve this problem. Solve the equation using the quadratic formula. 7. 7x^2=-8x -2 This is what I got x= -8 -or+ square root

58. ## Science

I need to know how a refrigerator works to come up with an example. Please keep it simple and easy to understand. or an example explaining how being able to understand scientific principles and think scientifically can help you solve problems and answer

59. ## math

8 divided by 3 plus 6= You asked 8 divided by 3 plus 6= (8/3) + 6 = 2(2/3) + 6 or 8/3 + 18/3 = ??/3 I don't understand how to describe pairs of related variables what's the difference between dependent & independent variables I'm not what class your

60. ## math

1.solve for the given variable: x + 1/2 = 1 1/2 3/4 1*** 2 3 2. solve for the given variable: 10/13n = -30/39 -20/13 0 100/169 -1*** 3. solve for the given variable: k-3/4 = 10 43 5.5*** 37 52 PLEASE HELP ME WITH MY MATH!!!!

61. ## Algebra

Solve graphically. x-y=0 y=x² The reason I don't understand the question is the second equation with the x². How do I graph that? I'm not sure if I ever graphed with an exponent, and if I did, it was a long time ago. I'm reposting this because I didn't

62. ## algebra 2

i need help with my algebra 2 homework, the section is called using matrices to represent data. here is one of the problems: -1/2A+(B-A) A=[7 3 -1 5] [-2 8 0 -4] and B= [6 0 11 -3] [-5 2 -8 9] i don't know how to do this problem and the book doesn't have a

63. ## Algebra

I don't quite understand how to solve matrices with three variables. If I have the equations: 7x-4y-2z=0 2x-3y+z=-0.25 -2x-2y+5z=0 How can I solve this? I saw the explanation in a site but I didn't understand it. They appeared to make random operations

64. ## Math

Hi. I found this question on a Math Counts practice test and it seriously confused me. I've never learned about this, and it would help if someone helped me. Thanks in advance. How many elements are in the intersection of the set of all the prime numbers

65. ## math. algebra 2

I need help with this problem I do not understand how to solve this kind of problems....can someone show me and explain it to me thanx. Find a Z-score satisfying the given condition: 82.9% fo the total area a is to the left of z.

66. ## algebra

What is the difference between an equation and an expression? Include an example of each. Can you solve for a variable in an expression? Explain your answer. Can you solve for a variable in an equation? Explain your answer. Write a mathematical phrase or

67. ## Algebra

I don't understand how to do this problems: Solve for the variable r, C=2PIr (PI is the pi symbol thing then r is next to it) and this problem solve for the variable l, S=B+1/2Pl please help :) When you solve for a variable, you want that "letter" on one

68. ## Algebra

There are 4 problems that I don't understand how to solve so, please help me. A numerical explanation with words explanation would be nice. Thank you tutors. Rewrite each equation so it is in the form ax + b = c or x + d/e = f, where x is a variable. Then

69. ## Calculus

A cylindrical drum is made to hold exactly 1m^3 in its interior. Assume that the material for the top and the bottom costs \$20 per m^2, while that for the side costs \$10 per m^2. Determine the radius of the drum that minimizes the cost of the material

70. ## Math ----- Calculus -- Word Problem

A cylinder is to be constructed so that its height plus the perimeter of its base must equal to 2pi cm. Find the ratio of the radius of this cylinder to its height if it is to have a maximum volume. My work: SA = 2pirh + 2pir^2 2pi = 2pirh + 2pir^2 0 =

71. ## math

there's a question that I don't understand and the direction says that 'solve problems as combination integer problems.remember to rewrite all double sign problems as combination problems before solving' and here's a question 50- -61+ - 170 =

73. ## Math

y= x-7 3x+6y=-6 I don't understand how to solve for the x-variable.

75. ## math

solving problems and crimes..can you solve the following cases? 1) what letter belongs to in the empty box? O T T F F S S E 2) write a sentence to describe this pattern.. 3,8,13,18,23,28,30,31,32 please help i don't understand.

76. ## Algebra

I have a few more questions that I either need help with or just need checking. Is the algebraic expression a polynomial? if it is write the polynomial in standard form, 1. 6x-9+8x^2 I got Yes; 8x^2+6x-9 Perform the indicated operations. Write the

I some problems that I need help with please. Add or subtact as indicated and write the results in standard form. 4. 6-(-5+7i)-(7-2i) Divide and express the result in standard form. --These problems I don't understand, do you have to multply the

78. ## math

I am helping my child with this. Can you show me how to Solve word problems by writing an equation with a variable to represent the given information and then solve the equatin.

79. ## Algebra 2

I know that were doing problems were there is a soultion given which is equal to X^? times a constant ... y = k x^? So this is problem I have to decide given a probelm x relationship to y (for example iverse square cube and so forth) this unkown variable

80. ## MATH

ok so I'm learning to solve problems like cos(x)=2 and sin(x)=5 I've wrapped my head around the process required to do so and I must say my brain is like @_@ mosh right now. Whenever I ask this question I never get a direct answer. I understand it's

81. ## math

Can't remember the way to solve for the variable. 5x + 6 = 7x. Answer is 3, but how to do other problems?

82. ## algebra 2

simplify 27^(-(2)/(3)) I know the answer is 1/9 but I don't understand how to solve it. I looked it up but I still don't understand. HELp!!

83. ## Social Studies

@Ms. Sue Can I get a link? I don't want to cheat! Thank you! What are the causes of problems the Mayas and other Native American groups face in Guatemala? How are people trying to solve these problems?

84. ## math

how do i solve this equestion i don't understan 2(x+1)-3x=3(3+2X) please give me details on how to solve it because i have 100 more to go and i don't understand a thing

85. ## math{HELP HELP}

i don't understand these mmath equations. 1) 6y = 24 2)y / 7 = 2 y=_________ On number one i know that if there is a letter next to a number it means multiplication.and i still don't know how to solve it. On number two i don't understand anything at all:(

86. ## History/Social Studies

Hi, can I please have a link? I don't like cheating on essay questions. Thanks!! What are the causes of problems the Mayas and other Native American groups face in Guatemala? How are people trying to solve these problems?

87. ## Social studies

I don't want links I want answers please and please make sure it's in your own words. What are the causes of problems the Mayans and other Native American groups fate in Guatemala? How are people trying to solve these problems?

88. ## math,algebra

How do you solve these types of math problems. Directions: Solve each literal equation for the indicated variable. A=1/2h(B+b) (For b) Area of a trapezoid It is just a matter of algebraic manipulation. A=(1/2)h(B+b) Multiply both sides of the equation by

89. ## Statistics

The average hourly wage of employees in a large nationwide industry is \$12.96. Assume the variable is normally distributed, with a standard deviation of \$4.46. In a randomly selected sample of 10,000 such employees, how many of them (correct to the nearest

90. ## Math

I'm doing some word problems on finding the areas of rectangles, its just like all complicated. I don't understand how to do them. For example: A square field had 3 m added to its length and 2m added to its width. The area is 90 m2(squared). Find the

91. ## Algebra 1

Each student will be assigned a variable(mine being C) the student is to create a creature to represent that variable. The student must make 10 creatures for the variable. Then the student must make 10 additional creatures to represent that variable

92. ## Graph problems!!!

Ok. so i'm supposed to find the coordinates of a line using the slope intercept method but i don't understand it!!! can some one PLEEAASE help me? also i'm supposed to graph a line using the same method and they give me the coordinates oly its in an

93. ## trig

rules of logarithms: can someone please explain how to do these problems? I understand the rules I just don't understand how they apply 1. e^(3lnx) 2. e^(1+2lnx) thanks!

94. ## College Math II

Solve each problem. Find the quotient and remainder when x^2 – 5x + 9 is divided by x – 3. I don't understand how to divide and solve this problem. Can someone help me understand the steps on how to do it. Thanks.

95. ## math

wx + zy = c Solve for y. I don't understand this. If you know what Carnegie is, then you would know I don't really understand. So please help me. help me with the steps

96. ## math

how would I solve 10=7-m? I don't understand how to find the variable and I use flowchart!none of my math books show me how! so how can I solve problems like these?

97. ## Algebra1!Plz help I have test 2morrow!!!

so would the new eqaution be... 2x+8=10 then.. 2x=2 x=1? We know that y = x + 8. So if x + y = 10, then x + x + 8 = 10. but what about the y?ANd what do I do afetr that? If you know what x equals, then you can calculate what y equals. Once you've solved

98. ## algebra

how would i work out the following problems solve each formula in terms of the given variable 1. 5d-2g=9 ;g The formula A=2h(l+w) gives the lateral area a of a rectangular solids with length l, width,w and height h. 2. solve this formula for h 3. solve

99. ## Algebra

I was given this problem to solve and no matter what order I multiply the variables I don't get the right answer. 27xy, when x=12.7 and y=100.4 the answer is 34,427.16 I cannot figure out the way to achieve this answer. I find problems with variable fairly

100. ## algebra

Solve the formula for the variable given.then use the info to find the value of variable. S=πr(h+k) Find h if r=2,k=3,and S=50 I really don't know how to answer this kind of questions :(