Thursday
July 31, 2014

Posts by MathMate


Total # Posts: 10,590

Math
Yes, the calculation is correct for the net price factor.

math :)
You're welcome!

math
Hint: a sector is a pie-piece, similar to a slice of pizza. The area of a sector of a given radius is proportional to the central angle. Area of Sector -------------- Area of circle central angle =------------- 360°

math :)
You're welcome!

math
Do it just like normal subtraction, except that when you borrow 1 degree, it becomes 60 minutes, ... 41-20-26 23-39-56 -------- 17-40-30

PHYSICS
Does it come with a diagram?

chemistry
Zn+2HCl -> ZnCl2 + H2 5.5 g of Zn = 5.5/65.382 M =0.0841 M 25 ml of 0.05M HCl = 25/1000*0.05 M = 0.00125 M < 0.0841/2 So the quantity of HCl governs. Assuming all HCl is consumed, amount of Hydrogen = 0.00125/2 M = 0.000625 M Convert that to the required temperature and ...

French :)
Je vous en prie!

French
Give it a try! You must know the name.

French
camping is an English word borrowed by the French language which means 1. the activity of camping 2. camp-ground. "Comment s'appelle" is an expression which translates to "what do you call ...." "ce" => this "terrain de camping" =...

math :)
You're welcome!

math
If the length of one of its sides is x. Then x/2 is half the side. An altitude divides the equilateral triangle into two congruent right triangles, each with half of one side (x/2) as the short side, the altitude as the long side, and the side (x) as the hypotenuse. So by usin...

math :)
You're welcome!

math
a' ÷ a = b' ÷ b so a' = b' × a / b

math :)
You're welcome!

math
Do you mean sin-1(0.398) = ? ° ? ' ? " = 23.45320822° multiply the decimal part by 60 =23°27.19249' multiply the decimal part by 60 =23°-27'-11.55" (approx.) =23°-27'-12" (nearest second)

math
Every 5 minutes, the minutes hand turns 30° If it turns 360° (from 12 to 12), then the distance is 43.96. You can use proportions to find how much distance the tip travels from 1 to 4.

math
If the 7-inch hand goes through a complete circle, it would travel the equivalent of the circumference of a circle of radius 7 inches. Use Circumference = 2πr How far would the tip travel from 1 to 4 o'clock?

probability
See response to your previous post: http://www.jiskha.com/display.cgi?id=1369507871

French
According to the Petit Robert dictionary, it also stands for vélo tout-terrain, which means mountain-bike. So the meaning can differ from one country to another.

French
Véhicule tout-terrain

Statistics
Here are some numbers for checking your answer. approximately y=2.3x+23 The correlation coefficient is over 0.99.

algebra
Reflection about the y-axis is given by: (x,y)-> r(-x,y)

Math
It is a binomial distribution, with p=0.6 (probability of success) q=0.4 (probability of failure) n=5 (number of steps) r=2 or 3 (number of successes) P(n,r)=nCr p^r q^(n-r) P(5,2)=5C2 0.6^2 0.4^3 =(5!)/(3!2!) 0.6^2 0.4^3 = 10(0.36)(0.064) = 0.2304 Similarly, for 3 tails, r=3,...

simple interest and compund interest.
It sounds like you have difficulties putting numbers into the formula you gave me, so I will do the first one for you. You can attempt the second one as a confirmation. A=P(1+rt) Since A=amount, so Amount=P(1+rt) P=3000, so Amount=3000(1+rt) r=0.03 (3%), so Amount=3000(1+0.03t...

simple interest and compund interest.
A=amount P=principal=$3000 r=0.03 t=number of years, missing from question. Take out your calculator and calculate according to the formula: A=P(1+rt) Here i=5%=0.05/12 (compounded monthly n=6 years = 6*12=72 months P=principal (unknown) A=final amount = $15000. From A=P(1+i)^...

HealthCare Finance Bonds
Sorry, meant "going back to IRS"

HealthCare Finance Bonds
a. At 12% yield, with 40% going back to IRA, he nets 12%(1-0.4)=7.2% b. and c dependent on answer of a, will give you a chance to try them.

Statistics
Here are a few articles that explain what a p-value is, with examples. One of them is a youtube link, if you so prefer. http://www.stat.ualberta.ca/~hooper/teaching/misc/Pvalue.pdf http://www.youtube.com/channel/HCM26EC2x5oEU http://en.wikipedia.org/wiki/P-value

expressions
Since the rate of filling is constant, it is a rule consisting of a linear expression. Let H=height, and x=number of days since today (day 0). Since water rises 2 feet per day, today's height, H = 14 feet. So the rule is then H = 14+2x where 2 = additional depth per day 14...

exponents :)
You're welcome!

exponents
#4 and #5 are both correct. For #8, it is x^8/y^8, since the question requires positive exponents. (You could have written it as x^8y^-8.) 1. 1/125 is 1/5^3. See if you can find the correct answer. 2. d^4*d^6 is d^10, so correction required. 3. the minus sign before the number...

scientific notation am i doing it right?
signature.

scientific notation am i doing it right?
Sorry, finger faster than the brain, forgot to change since last post.

scientific notation am i doing it right?
#1 is correct. The power of 10 refers to the number of positions the decimal point has to be moved, not the number of zeroes. So for #2, it should be 9.82000*100000=982000 Similarly, for #3, 9x10^3=9/1000=0.009 I will leave #4 for you to try.

scientific notation am i doing it right?
All correct, well done!

Sequences
Find the rule for number 2, which is a geometric series. You can tell if it is a geometric series by dividing any term by the previous. If the quotient is the same, then it is a geometric series. The rule for a geometric sequence is: t(n)=ar^n and r is the quotient by dividing...

Sequences
Let the nth term of the arithmetic sequence be t(n)=ax+b then t(1)=a(1)+b=7 t(2)=a(2)+b=12 Subtracting, we find 2a-a=12-7 which gives a=5 Substitute back into the formula, t(1)=5(1)+b=7, so b=2 the complete rule is then t(n)=5x+2 The nineteenth term is therefore t(19)=5*19+2=9...

polynomials am i doing it right?
You're on the right track... 1. expand it and write it out when it is a subtraction: (x^4+7x^3+7)-(2x^4-4x^3+1) = x^4+7x^3+7) -2x^4+4x^3-1 = -x^4 + 11 x^3 + 6 2. space out your terms to avoid losing some of them. (3n^3 + n^2 -n -4)+(5n^3 -4n^2 + 11) = 3n^3 + n^2 -n -4 + 5n...

How to get quick responses to your math questions
Also, - DO check that the question you are about to post is complete and accurate before pressing the "post" button. - Do not omit parentheses. If the numerator or denominator of a fraction has more than one term, you need parentheses around them when you transcribe ...

How to get quick responses to your math questions
Math is a wide subject, ranging from K to 11, college and university. Then there is algebra, trigonometry, geometry, arithmetic, calculus, number theory, ... etc. Not all teachers answer all math questions (many do). If you would give a little more detail on which branch of ma...

Physics
Hint: Find the resultant of the two given forces. The third force (which keeps the resultant in equilibrium) is a force which is equal in magnitude to the resultant, but opposite in direction.

Maths
Use the property of intersecting chords PA*PB=PC*PD In this case the chords intersect outside of Γ. Also, if T is the tangent to Γ passing through P, then PA*PB=PC*PD=PT²

math
Trade discount = $679.95*0.30

trig
So on the Cartesian plane, it is in the fourth quadrant, with x-y as (900,-500). Atan(-500/900)= -29° approximately. So the bearing is S61°E.

Calculus
Use substitution, p=sin(x), dp=cos(x)dx I=∫ydx =∫cos(x)(2sin(x)-1)^6dx =∫(2p-1)^6 dp Substitute again, u=2p-1, du=2dp I=∫u^6 (dp/2) =u^7/7 ÷2 + C Now back substitute u=2p-1=2sin(x)-1 I=(2sin(x)-1)^7 /14 +C

Math/ Algebra
Rewrite the equation in symmetric form x/a + y/b = 1 where a and b are the x- and y-intercepts respectively. y/2 -3x/5 = 1 can be rewritten as: x/(-5/3) + y/2 = 1 Identify the intercepts and graph accordingly.

Math
15/20/20 is a successive discount of 15%, followed by 20% on the discounted price, and finally another 20% of the doubly discounted price. For example, $1000 with a trade discount of 15/20/30 would have a final discounted price of $1000*(1-0.15)(1-0.20)(1-0.30)=$476 So the tra...

Math/ Algebra
See http://www.jiskha.com/display.cgi?id=1369451313

Math
p=probability of scoring (success) = 0.8 q=probability of not scoring (failure = 0.2 Assuming the probability does not change over time and is independent of previous results, then we can apply the binomial distribution: P(7+ out of 8) =8C7*0.8^70.2+8C80.8^8 =0.34+.17 =0.50 (a...

statistics
Ah! I see it now. "y (in tens of thousands of dollars)" That might be the culprit.

statistics
Did you put $5.13 or 5.13?

Statistics
There are different ways to find the regression line. Do you know which one you are supposed to use? It should be around y=-0.6x+310. Try to calculate the coefficients and we can check you answer. Do specify the method, and work details if you can.

statistics
If you are working on the computer, you have to get the answer exactly right. It asked for the answer to 2 decimal places. If you put three (3.625), it could mark you wrong. On the other hand, there are two ways to round it to 2 decimal places. Most people round it up when it ...

Math - please help
The height is 280 ft. Distance from apex to mid-point of base = 356.1 ft = slant height. Area of one side = (1/2)base*slant-height then choose the correct answer.

Calculus
Let f(x)=sqrt(1+6x) then f'(x)=3/sqrt(6*x+1) and f'(0)=3 Thus the slope of the curve is 3 at x=0. f(0)=1 means that the tangent to the curve passes through (0,1)=(x0,y0). So the linearization is y=Ax+B =Slope(x-x0)+y0 =3(x-0)+1 =3x+1 Identify A and B for your answer.

Maths
For x near 1, you can use linearlization, which is f(x)=f'(1)(x-1)+f(1) =(1/8)x+f(1) Therefore, within the errors of the linearization, f(x)-f(1) = (x-1)/8 (approximately)

geometry - missing information
To scale or not, we don't get to see it. So we depend on you to describe the figure.

please answer simple stat any tutor
Think of the test as μ1>μ2 Is the solution of μ1 on the left, right or both sides of μ2?

algebra
slope of line y=(2/5)x+7 is (2/5) Slope of line perpendicular to it is -(1/slope)=-5/2.

Frenchhhhhhhhhh
All the cases are direct objects, so you need to replace them by le/la or les (not "des")depending on whether the nouns you are replacing are in singular or plural, and masculine or feminine. There is an extra caution in French is that the pronouns of direct objects ...

Frenchhhhhhhhhh
Replace by what?

Algebra - clarifications required
y=2x=1 is not an equation of a line. Please clarify the typo.

Algebra - clarifications required
1. slope = 15/12 2. slope = -5/4 3. slope = ? (two equal signs, so the sign of the slop could go either way. Please clarify.

pre calc
If sin(x)=-3/5 in Q3, then cos(x)=-4/5 (using cos²(x)=1-sin²(x)) Similarly, cos(y)=5/13 in Q1 means sin(y)=12/13 sin(x-y)=sin(x)cos(y)-cos(x)sin(y) =-3/5*5/13 - (-4/5)*12/13 =(-15+48)/65 =33/65

Math
Yes, it's correct. 2 gals must be added (and well agitated).

Math (Probability)
The size of the sample space of the last throw is 20*20=400. Out of the 400 outcomes, Bret needs those where his throw is 11 or more than Shawn's, namely: (12,1),(13,1),(14,1)...(20,1) (13,2),(14,2)...(20,2) ... (19,8),(20,8) (20,9) There are ∑(i), i=1,9 outcomes. Can ...

math
One cup is 240 ml 1 table-spoon is 15 ml. So 1 cup = 16 table-spoons How table-spoons are in 16 gals? This equals how many cups?

Math
Certainly, if the father has a foot-length equal to 150% of that of Aaron.

Physics
Use the definition of a Coulomb. There are 11 ampères of current 10 minutes = 600 seconds. Can you now figure it out?

math
Let E=age of Mr. Edwards. (E+15 + E/3+15) = 86 Solve for E.

Pre-Calculus
Draw a right triangle with XY vertical, and a base AX of 200 ft. The angle XAY=25 degrees. Use the definition of tangent(A)=tangent(25°)=XY/AX Solve for XY.

7th Grade Math
Volumes are (linear ratio)³ and areas are (linear ratio)²

probability
There were 40 outcomes, of which 6 were spinning a 2. Experimental probability = 6/40 = 3/20.

7th grade math help :)
You're welcome!

7th grade math help
Assuming one must make a single choice in each group, so it is a three-step experiment. choices for group 1 = 2 choices for group 2 = 3 choices for group 3 = 2 Total number of outcomes in the sample space is therefore the product of the choices in each group (step).

physics
v0=5.5 m/s v1=0 m/s F=160 N m=80 kg Use Newton's second law, F=ma a=F/m=-2 m/s-2 (deceleration) Use: (v1^2-v0^2)=2aS So S=(v1^2-v0^2)/2a=30.25/4=7.5625 m

Physics
F=>M2=>F1=>M1 On the frictionless table, both will have an acceleration a. Draw the free-body-diagrams (FBD) and conclude that M2.a = (F-F1) M1.a = F1 using Newton's second law. Solve for F1 and a. Part (b) can be found in a similar way.

calculus
Steve is right. Whenever you transpose a fraction from a book to a single line to post, you need to insert the implicit parentheses. In this case, I believe it is 1000 = 10,000(1 − (5/[5 + e^−0.001x]))

calculus
p = 10,000(1 − (5/5 + e^−0.001x)) for p=1000, 1000=10000(1 − (5/5 + e^−0.001x)) 5/(5+e^(-0.001x)=0.9 e^(-0.001x)=5/0.9-5 take log -0.001x = log(5/0.9-5) x=-1000 log(5/0.9-5) =587.8, say 588 (b) can be done in a similar way.

Math 208
Let x be the amount he invested at 6%. Then x-1400 is the amount he invested at 5%. Total interest after 1 year x*0.06+(x-1400)*0.05=172 0.11x=172+1400*0.05 0.11x=242 x=2200 Check 2200*0.06+800*0.05=132+40=172 ok.

programming - C++ or Java?
The instructions are quite clear as to what to do. I suggest you read through your teacher's notes or instructions and give an attempt. Programming is learned by actually writing and compiling code. Copying or reading alone will not help you solve your next problem. You...

Physics
Speed of sound in sea water depends on the temperature and salinity. At 25 degrees and 35 ppt salinity, the speed of sound is approximately 1551 m/s. So divide 19000/1551 to give the time in seconds it takes.

Math
Basically you cannot. A bar graph puts different numbers into the same class, and so there is loss of information. If you have a problem in hand, post the data (if they are not too numerous) and we can appreciate better the problem in hand.

Calculus
Parentheses are implicit when it is printed in fraction form. If it is printed as a fraction, your post is linearizing it (put on a single line) and it is necessary to insert parentheses around all numerators or denominators which contain more than one term.

Calculus - clarifications required
Could you please insert parentheses to clarify the question? 10x-3/5x+6x could mean (10x-3)/(5x+6x) [??] 10x -(3/5x) + 6x [??] [(10x-3)/5x] +6x [??} etc.

Algebra - clarifications required
Jamila, please clarify what SR stands for. Is it a monetary unit, or is it an abbreviation for some term?

calculus
Find derivative with respect to x: y'(x)=dy/dx=6x-5 Evaluate derivative at x=3: y'(3)=6(3)-5=13

Algebra
Using calculus, it would be finding dy/dt and equating to zero to solve for t. Since it is algebra, you could complete squares: y=-4.9(t-7)²+49*4.9 =-4.9(t-7)²+240.1 which means that the maximum height of 240.1 m at t=7.

math
You can take the average, namely [(1+2)/8]2 = 3/16 If you want just ANY fraction between, you can add the numberators and denominators: (1+1)/(8+4)=2/12 = 1/6

Computer Science
Depending on the complexity of the game, it takes proficiency in the language, which means lots of late nights leaning and practising programming on different projects. In short, you have to like it so that it is not work, but fun.

please hurry
It is almost impossible to show the calculations here because the proportional font used here makes it difficult to line up calculations. You can look up an example at the following link: http://www.homeschoolmath.net/teaching/square-root-algorithm.php

maths-formula
Sorry mate, this expression does not have rational factors.

Physics
Since it is an elastic impact, we can equate energies.

Probability
Only question left is how Andrew found a fair 10 sided die. Platonic solids have 4,6,8,12 and 20 sides!

Probability
Use a probability tree to find that the overall probability of winning is [∑(i²)/100]/10] for i=1 to 10 =385/1000 which should be simplified to an irreduceable fraction a/b. The sum of a+b is then 277.

maths
Subdividing a pizza according to the number of people, getting change after paying for a purchase, finding unit price of items in a grocery store to compare unit cost, checking that the restaurant bill is correct, calculating tip, counting money after a withdrawal, finding the...

Algebra
See http://www.jiskha.com/display.cgi?id=1369047938

Algebra
See http://www.jiskha.com/display.cgi?id=1369047938

French-SraJMcGin
Watch spellings of "Sacré-Coeur", as pointed out by Mme Sra. The proper name seems to be "La Basilique du Sacré Coeur"

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