# Posts by Helper

Total # Posts: 1,821

**algebra**

R = 221.19x - 0.2x^2 R = 221.19 (273) - 0.2(273)^2 R = 221.19 (273) - 0.2(74,529) R = ?

*January 27, 2011*

**Math**

To understand this you really need to sketch this out. Think of the x/y axis on a graph, with the y-axis as North and the x-axis as East. Both boats are traveling from the North (top of the y-axis), toward East (down toward the x-axis). The first bearing, forms a 47 deg. angle...

*January 27, 2011*

**Exponents**

Meant to comment, If you square x^-2, x^-2 * x^-2 = x-4 = 1/x^4 1/^4 = 81 square root of both sides 1/x^2 = 9 You are back to the above.

*January 27, 2011*

**Exponents**

x^(-2) = 9 Since, x^(-2) = 1/x^2 1/x^2 = 9 Multiply both sides by x^2 1 = 9x^2 1/9 = x^2 square root of both sides + - 1/3 = x

*January 27, 2011*

**Math EASY**

Like Ms. Sue said. I just did this based on info you provided.

*January 27, 2011*

**Math EASY**

(83 + 3/5 + 5/5)/3 (83 + 60 + 100) = 243/3 = 81 81%

*January 27, 2011*

**adult education-Psycology?**

If you would like help in a timely manner please follow directions and put your school subject in the "School Subject" box.

*January 27, 2011*

**MATH**

If I am picturing this correctly, a right triangle is formed, with the hypotenuse c = 75 cm. Since the top of the wall is 5.4 m above ground, 5.4 - side a = height above ground to the roof edge. Angle A = 180 - (23 + 90) = 82 degrees sin 82 = op/hyp = a/c = a/75 0.9903 = a/75 ...

*January 27, 2011*

**arithmetic**

5/6 * 4 Since 4 = 4/1, you multiply the numerator of 5/6 times 4, and the denominator of 5/6 * 1 5/6 * 4/1 = 20/6 = 10/3

*January 27, 2011*

**5th math**

x = number of boys x + 4 = number of girls x + x + 4 = 30 2x + 4 = 30 2x = 26 x = 13 x = number of boys = 13 x + 4 = number of girls = 13 + 4 = 17 13 boys + 17 girls = 30

*January 27, 2011*

**5th grade**

Pat, I read that wrong. 77/35 * 285 = ?

*January 26, 2011*

**5th grade**

All that info and all the problem wants is the cost for 285? .77 each x 285 = ?

*January 26, 2011*

**5th math**

w = width, L = length Perimeter = 2w + 2L 60 = 2w + 2L 60 = 2(w + L) Divide both sides by 2 30 = w + L Since a square has equal sides and w + L = 30 15 + 15 = 30 So each side is 15 15 + 15 + 15 + 15 = 60 I don't know if a 5th grader does this type of problem like I did. If...

*January 26, 2011*

**Algebra 1**

2x + 5y = 4 Add -2x to both sides 5y = -2x + 4 divide both sides by 5 y = -2/5 y + 4/5 So, slope m = -2/5 Perpendicular lines, the slopes are negative reciprocals of each other. Slope = -2/5 m1 * m2 = -1 -2/5 * m2 = -1 m2 = -1/(-2/5) m2 = 5/2 Now you have to find b, for the ...

*January 26, 2011*

**Algebra 1**

Did you see the answer to your post below? Post your work so I can see where you are having trouble.

*January 26, 2011*

**5th math**

Mean is the average ADD the number of letters and divide by the number of numbers. 105 + 97 + 88 + 86 = sum Average = sum/4

*January 26, 2011*

**5th math**

28.5 min for 4 miles 28.5 min/4 mi = 7.125 min each mile So, this is your equation 4k = 28.5 k = 28.5/4

*January 26, 2011*

**algebra**

-4x - 12 = 0 Add 12 to both sides -4x - 12 + 12 = 0 + 12 -4x = 12 Divide both sides by -4 x = ?

*January 26, 2011*

**Algebra 1**

x + 6 = length of sidewalk x + 4 = width of sidewalk A = Lw A = (x + 6)(x + 4) (x + 6)(x + 4) = 39 Expand and solve for x

*January 26, 2011*

**pre algebra-math**

helper - please choose another 'Name' I've been using this name and it is very confusing when you use the same name. Thank you so much. Just put a number next to the name, if you want to use 'helper'.

*January 26, 2011*

**pre algebra-math**

yes^ please help 18/12 and 3/27

*January 26, 2011*

**...**

you mean 18/12 then the other question is 3/27!!!

*January 26, 2011*

**Algebra 1**

(6,7);6x+y=9. y = mx + b 6x + y = 9 y = -6x + 9 m = -6 m1*m2 = -1 -6*m2 = -1 m2 = 1/6 So, the slope of the perpendicular line is 1/6. y = 1/6 x + b Now find b with point (6,7). y = 1/6 x + b 7 = 1/6 (6) + b 7 = 6/6 + b 7 = 1 + b b = 6 y = 1/6 x + b y = 1/6 x + 6

*January 26, 2011*

**Algebra 1**

Your equation is not complete. 6x + = 9?

*January 26, 2011*

**ALGEBRA**

V = e^3 (e = edge) 64 = e^3 e = 4 Can you take it from here?

*January 26, 2011*

**Algebra**

Remaining angle = 180 - (55 + 47) Supplementary angles total 180 degrees You should be able to try this now.

*January 26, 2011*

**7th grade math**

Area = ((b1 + b2)/2)* h 4 = ((b1 + b2)/2)* 1 4 = ((b1 + b2)/2) Multiply both sides by 2 8 = b1 + b2 So, the sum of base1 and base2 = 8 I don't know what you mean by 'best numbers'?

*January 26, 2011*

**Algebra**

Find the mean (average) 1 + 2 + 4 + 5 + 6 + 8 + 9 + 10 + 10 = sum Average = sum/9 The median is the middle value, 6 mean - median = postive difference Then express this difference as a fraction

*January 26, 2011*

**Pre Calc**

If I am understanding this picture, a right triangle is formed with angle A = 50 degrees and side b = 23 (15 + 8). You need the length of a, which is the streetlamp. tan A = opp/adj = a/b = a/23 tan 50 = a/23 1.19 = a/23 Solve for a, for your answer

*January 26, 2011*

**math**

x = one angle 2x = largest angle 1/3 x = smallest angle x + 2x + 1/3 x = 180 Solve for x

*January 26, 2011*

**Reading APE**

Did you read this? Tell us what you think and someone will proof your answer.

*January 26, 2011*

**algbra**

You need more parentheses in your problem. t = (r + k)/(2w)? t = r + (k/(2w)) ? t = r + (k/2) w ? Or?

*January 26, 2011*

**Algebra**

Answer is 2a^(-4)c^4 a^6/a^10 = a^(6-10) = a^-4

*January 26, 2011*

**Precalc**

You're welcome!

*January 26, 2011*

**Precalc**

solve 5(2^(3x)) = 8 5(2^(3x)) = 8 2^3x = 8/5 2^3x = 1.6 take logarithms of both sides 3x log 2 = log 1.6 Divide both sides by 3 log 2 x = log 1.6/(3 log 2)

*January 26, 2011*

**Pre-Algebra**

2/3 m - 5 = n Multiply both sides by 3 2m - 15 = 3n 2m = 3n + 15 m = ?

*January 26, 2011*

**L Pre-Cal**

3x-5y+5=1 5x-2y+3z=0 7x-y+3z=0 Do you have a typo? 3x - 5y + 5? = 1 There is no z term in equation 1?

*January 26, 2011*

**pythagrean theorem**

Ms. Sue is correct. I get 12.5 too.

*January 26, 2011*

**math**

Convert a) through e) to addition expressions Change the sign to + and change the sign of the number to the opposite of what it is. a) -6 - 9 = -6 + (-9) b) -10 - (-12) = -10 + 12 Now you do c), d) and e)

*January 26, 2011*

**math**

m = (-1-3)/(2-(-4) You had 3, should be 2

*January 26, 2011*

**math**

A(-4,3) and B(2,-1) If you have points A(x1,y1) and B(x2,y2) Slope m = (y2 - y1)/(x2 - x1)

*January 26, 2011*

**Math**

V = lwh Divide both sides by lh w = V/lh

*January 26, 2011*

**math**

Assuming simple interest, I = PRT Interest = Principal x Rate x Time 525 = 3500(.06)T 525 = 210T T = ? years

*January 26, 2011*

**ALGEBRA/PLEASE HELP**

LCM = (1 - 2t)(1 + 2t)

*January 26, 2011*

**Algebra 1**

Put the line in slope-intercept form, y = mx + b m = slope, b = y-intercept

*January 26, 2011*

**Math**

r = 2s - 8 2s = r + 8 s = 1/2 r + 4

*January 26, 2011*

**geometry**

Without seeing the diagram, not enough info. You would have to give a description that would allow for the tutor to understand where exactly this cord is, among other things. Could you solve this problem if all you knew was the info you posted? Think about that when posting a ...

*January 26, 2011*

**math**

x = amount for 3 2/5 x = amount for 2 5(2/5 x) = amount for 1 x + 2/5 x + 5(2/5 x) = 102,000 Solve for x

*January 26, 2011*

**algebra2**

Yes, b is the missing variable. But 3a^2b^2x still does not = 6a^2b^2x 6a^2b^2x = 6a^2b^2x

*January 26, 2011*

**math**

Find the inverse of f and see if it is g.

*January 26, 2011*

**Math**

Then post your answer, and ask for the answer to be checked. Less work for the tutor's, to type "yes" or "no", then to type out how the problem is done.

*January 26, 2011*

**Math**

Can you do any of these type problems? Post your work where you are stuck and someone will help. Tutors will not do your homework.

*January 26, 2011*

**math**

See the 1st link below under Related Questions. This exact problem was answered.

*January 26, 2011*

**algebra**

a4b + a5b + 3 What factors do all expressions have in common? Answer, none This cannot be factored. All you could do is, a4b + a5b + 3 ab (4 + 5) + 3

*January 26, 2011*

**algebra**

and the cost is 55.00 labor is 4.00 ? How about some periods or commas. Sometimes, if tutors cannot make out your post, they move on to one that they can understand.

*January 26, 2011*

**Algebra 1**

(6,7);9x+y=6 Put in y = mx + b form 9x + y = 6 y = -9x + 6 So slope m = -9 Perpendicular lines have slopes that are negative reciprocals of each other. Meaning, m1 x m2 = -1 m1 = -9 -9 x m2 = -1 m2 = 1/9 So, the slope of the line will be 1/9 y = 1/9 x + b To find b, P(6,7) y...

*January 26, 2011*

**Algebra 1**

Do you need a line parallel to 9x + y = 6? Or? I'm happy you understand!! Good work.

*January 26, 2011*

**Algebra 1**

(-8,6); 2x = 3y + 4 3y = 2x - 4 y =(2/3)x - 4/3 So, slope m = 2/3 Use y = mx + b and P(-8,6) to find the equation parallel You know m = 2/3, so you have to find b. y = 2/3 x + b Put in x any y values and solve for b. 6 = 2/3 (-8) + b See how my equation is different than yours...

*January 26, 2011*

**Algebra 1**

Esther, see your post below at 3:11pm that I answered. I gave you detailed instructions on how to do this almost exact problem. You will never learn without attempting the problem yourself. Post all your work if your are stuck.

*January 26, 2011*

**algebra2**

Correct, (x - 3)(x + 5)

*January 26, 2011*

**algebra2**

x(x-3) + 5(x-3) What factors do both expressions have in common? Answer, (x-3) Can you factor now?

*January 26, 2011*

**algebra2**

Correct!!

*January 26, 2011*

**algebra2**

15Rx - 3Rex What factors do the two expressions have in common? Answer, 3Rx. Can you factor now?

*January 26, 2011*

**geometry**

Your question makes no sense. Please post the question exactly as it appears from your homework. If the side = 140 in., that is the length of that side. There is nothing to calculate for that side.

*January 26, 2011*

**math**

Your question is unclear. A can of lemonade concentrate has a capacity of 355 mL. Does this mean that the can of concentrate makes 355mL of lemonade ? Or, do you mean that 355mL combined with 4 cans of water, for the total amount of lemonade? If the second, without knowing the...

*January 26, 2011*

**Math**

y = -6x Slope m = -6 There is no y-intercept. Pick points to graph. y = -6x x = 0, y = 0 x = 1, y = -6 x = -1, y = 6 x = 2, y = -12 x = -2, y = 12 If you graph this, you will see a line through the origin. This line does not intersect the y-axis. Therefore, there is no y-...

*January 26, 2011*

**math**

17 2/3 + 23 1/4 Find the LCD for 2/3 and 1/4 LCD = 12 17 8/12 + 23 3/12 = ? Now, can you add them? Reduce the answer if necessary

*January 26, 2011*

**math**

-12 + r = -11 Add 12 to both sides 12 + 12 + r = -11 + 12 r = ?

*January 26, 2011*

**Algebra**

x = lbs of cheaper coffee 2.75x = value of cheaper 100 - x = lbs of better coffee 5(100 - x) = value of better 100 = lbs of mixture 3.90(100) = value of mixture 2.75x + 5(100 - x) = 3.90(100) Solve for x, lbs of cheaper 100 - x = lbs of better

*January 26, 2011*

**Algebra**

RT = D (Rate x Time = Distance) R = rate of southbound train 4 = time of southbound 4R = distance of southbound train R - 12 = rate of northbound train 4 = time of northbound 4(R - 12) = distance of northbound train Since the sum of distances = 528 4R + 4(R - 12) = 528 Solve ...

*January 26, 2011*

**math**

Do you mean 5 x 100 = 500 12 x 10 = 120 500 + 120 = 620

*January 26, 2011*

**Algebra**

d = number of dimes .10d = value of dimes 85 - d = number of quarters .25(85 - d) = value of quarters 0.10d + .25(85 - d) = 14.50 Solve for d, number of dimes 85 - d = number of quarters

*January 26, 2011*

**math**

100 cm = 1 meter 4.5 meter x 100 cm = 450 cm 450 cm / 4.5 cm = number of pieces of ribbon 450/4.5 = ?

*January 26, 2011*

**math**

x = attendance at Friday's game 2/3 x + 7000 = attendance at Thursday's game x + 2/3 x + 7000 = 77000 Solve for x - Fri 2/3 x + 7000 - Thur

*January 26, 2011*

**Algebra 1**

Parallel to 3x = 5y + 2 through P(-5,8) Parallel lines have equal slopes First, you need to put the given line in slope-intercept form, to find the slope. Slope-intercept form, y = mx + b m = slope b = y-intercept 3x = 5y + 2 To put in slope-intercept form, solve for y. 3x = ...

*January 26, 2011*

**algebra**

x = grams of copper 0.075x = value of copper 170 - x = grams of silver 0.925(170 - x) = value of silver (100 - 7.5 = 92.5) .16(170) = value of mixture 0.075x + 0.925(170 - x ) = 0.16(170) Solve for x, grams of copper (170 - x) = grams of silver

*January 26, 2011*

**maths**

If your equation is, x + 3x - 6.75 = 0 4x = 6.75 x = 1.6875 You should ALWAYS proofread your problem after posting to make sure it makes sense. I have no idea what the ? means.

*January 26, 2011*

**ctc**

Do you have a question?

*January 26, 2011*

**math**

From Diana's solution, 2.4 hrs = 2 hrs 24 min To convert .4 hrs to minutes, multiply by 60. .4 hrs * 60 min = 24 min

*January 26, 2011*

**Math**

See 1st link below under Related Questions. This exact question was answered.

*January 26, 2011*

**Algebra II**

Poorly worded question. Natural numbers are the counting numbers, 1,2,3,4,5..... Whole numbers are the natural numbers including zero. No fractional parts or decimals and no negative numbers. What is meant by opposite? Since counting numbers are positive, negative? but ...

*January 26, 2011*

**Physics**

See the links below under related questions. At least three of the links have answers to this almost exact question.

*January 25, 2011*

**math**

You're welcome.

*January 25, 2011*

**math**

The formula for perimeter is, P = 2w + 2 L 30 = 2w + 2L 30 = 2(w + l) 15 = w + l So, for a perimeter of 30, you want to sketch rectangles that the width and length total 15. Some possible rectangles, 14 + 1 = 15 13 + 2 = 15 12 + 3 = 15 11 + 4 = 15 10 + 5 = 15 9 + 6 = 15 8 + 7...

*January 25, 2011*

**Physics**

The first link below does have an answer. Whether it is a complete answer, I wouldn't know. You have to scroll down quite a bit for the answer. I am pasting that answer here. Maybe it will help you get started. Physics - drwls, Tuesday, March 23, 2010 at 9:48pm First you ...

*January 25, 2011*

**Physics**

See the 1st link below under Related Questions. A similar problem was answered.

*January 25, 2011*

**CP Geometry**

(sqrt(-60/5)) Break it down ((sr(-1))(sr(4))(sr(3))(sr(5)))/(sr(5)) 2i (sqrt(3))

*January 25, 2011*

**Physics**

See the 1st two links below under Related Questions. This almost exact problem was answered.

*January 25, 2011*

**math**

Lisa, I hope I didn't sound mean to you. That is not my intention. You will never learn unless you try. It takes practice. :) Is there something in particular you don't understand about dealing with fractions?

*January 25, 2011*

**math**

Tutors do not do your homework. It is obvious that you are struggling with this. The only way you will learn is practice. Try these problems YOURSELF. If you have a specific question we will be more than happy to help, but YOU must attempt these problems first.

*January 25, 2011*

**math**

And, ignore how I said that I do it. Do it your way, however you were taught. Your way IS correct. I just prefer to do it the way I was taught. I don't want to confuse you. :)

*January 25, 2011*

**math**

Ok, sorry, your answer 8 25/72, was the SUM, not the final answer, which is the average. 8 25/72 is correct for the sum. You have to divide the sum by 2, for the average. So however you were adding is correct.

*January 25, 2011*

**math**

What grade are you in? Unless there is a new way taught for adding fractions, you can't do it like that. You have to convert each mixed number to a fraction 3 2/9 = 29/9 5 1/8 = 41/8 Then you add 29/9 + 41/8 Find the LCD 232/72 + 369/72 = 601/72 601/72 divided by 2, ...

*January 25, 2011*

**math**

Not correct. Post your work so I can see what you are doing wrong, because you are not even close. :)

*January 25, 2011*

**math**

Yes, always. All fractions have to have the same denominator to add.

*January 25, 2011*

**Math**

How did you get 40 from that? Do you mean 200/(x - 1) = 200/(x + 10) cross multiply 200(x + 10) = 200(x - 1) 200x + 2000 = 200x - 200 NO solution to this

*January 25, 2011*

**Math**

Thank you. :)

*January 25, 2011*

**Math**

Please see your 1st post for an answer. And, please don't repost a question without first checking to see if your original post was answered. Please have patience. The tutors volunteer their time to help you. Sometimes it takes awhile for a post to be answered. You have ...

*January 25, 2011*

**Trig**

I apologize. The answer hadn't been posted when you posted this.

*January 25, 2011*

**Trig**

See your 1st post for the answer. And, please check your original post for an answer before reposting.

*January 25, 2011*