Wednesday
May 25, 2016

Posts by JJ

Total # Posts: 1,002

science
There is one zinc and 2 chlorine
February 21, 2013

Algebra
To find the axis of symmetry you find: x = -b/2a this comes from the quadratic formula.
February 21, 2013

Math
if 1/3 of the coins are dimes than we must have 2 dimes which = 20 cents so the value of the dimes is 1/4 the value of the other coins 20 cents = 1/4 (the other coins) so the other coins must be worth 80 cents So.. how much money does Kelsea have? H
February 21, 2013

calculus
rewrite the square root of x as x^1/2 This is the quotient rule. demoninator times the derivative of the numerator minus the numerator times the derivative of the denominator all over the denominator squared. So... We know the derivative will have an x^2 in the denomoniator. ...
February 21, 2013

English
What about star-crossed lovers. Maybe you could look at Romeo and Juliet and other star-crossed lovers in history. Also, the musical WestSide Story was an updated version with Tony and Maria. I don't know if you would want to make a comparison between the two.
February 21, 2013

math
If it is 30,00 or more.. I think you would just add all of the probabilities. .315+.180+.031
February 21, 2013

Chemistry
No, to make it neutral you would have to add OH ions. Water will dilute it and make it less acidic, but it still will be an acid.
February 21, 2013

Math
Simple interest is just: Interest = Principle x rate x time be sure to write % as a decimal to 5% = .05 and 3% = .03 You can add your interest to the original value to find the future value. Compounded annually: Future value = P(1+ rate)^time tiffany's problem: Future ...
February 21, 2013

Math
Then you just have to multiply 2400 x .105 x 1.5
February 21, 2013

Math
Did you mean find the simple interest? If so... here is the method to use. Interest = Principle x Rate x time P = 2400 R = 10.5% use .105 in the formula T = 1.5
February 21, 2013

Physics
V= IR in this case V = I(R1+R2) so we have 15 = IR1 + IR2 (15 - IR1)/I = R2 we will use this later in our subsitution. We also know that... 15 =(I+.05)R1 and 15 = (I+.025)R2 since both equal 15, they must equal each other: (I+.05)R1 = (I+.025)R2 Use the substitution for R2 ...
February 21, 2013

Math incomplete
I don't see your function.
February 21, 2013

Geology
I think it is by the fossils found in rock strata.
February 21, 2013

Earth Science
Now, I think it might be Potassium.. I just saw anothr post with K -40 has a half life of approx. 1.25 billion years.
February 21, 2013

Earth Science
You want a long half-life for older rocks. I think it may be argon, but you need to lookup the half-lives of each of them. You can probably google it.
February 21, 2013

physics
A - B = +5 A - C = -16 Do between B-C we must have -21
February 20, 2013

quadrilaterals
The sum of the angles = 360 paralleograms have pairs of equal angles. You have 110 degrees so far. Now can you find the other two angles?
February 20, 2013

science
a higher velocity or more mass??? is this is what you are looking for?
February 20, 2013

math
What do you need to know about percents? Percent means out of 100 like 20% means 20/100 or .20
February 20, 2013

physics
I would say no force since it is in free space. I am not 100% sure.
February 20, 2013

math
Add up all of the scores and then divide by 5 since you have 5 scores.
February 20, 2013

algebra
The y-intercept is easy in this form of the equation. Y = mx + b b is the y-intercept. Written (0,1) To find the x - intercept let y = 0 in the equation and then solve for x. (x, 0) is the form of the x - intercept.
February 20, 2013

finance
Just multiply 7100 times .109 since it is the apr.
February 20, 2013

math
If you sliced 12 and you need 30 total. that means you have 18 left to do and you can do 2 per minute. How many minutes will it take? I will check your answer.
February 20, 2013

math
Sorry, I don't. I am on her quite often.
February 20, 2013

math
Yes. that is it. I hope it makes sense to you.
February 20, 2013

math
(-8)(-2) that takes care of the coefficents = 16 (x^2)*(x^1) = x^3 (y^1)(y^3) = y^4 Now, put them all together and you will have the answer.
February 20, 2013

math
Multiply the coefficients (numbers in front). for the letters with exponents. You keep the letter and you add the exponents. Remember that y is y^1 Try it and I will check it for you.
February 20, 2013

Science
It depends on what you are going to use to compare the difference. suppose there were 20 people and 5 remembered better if they heard the numbers and 15 remembered better if they saw them. That could be a bar graph. If you were going to use a % right, you might want to make a ...
February 20, 2013

Science
Could you use a bar graph? One bar for eyes and one bar for ears??
February 20, 2013

algebra
Yes 5^3 or 125. I am not sure how your teacher will want the answer.
February 20, 2013

algebra
so keep the base of 5 and add the exponents for the multiplication. that gives you 5^11/5^8 For division, keep the base of 5 and subtract the exponents. What is your final answer?
February 20, 2013

algebra
By using the law of exponents, we cannot combine anything because the terms are all different.
February 20, 2013

algebra
You can't simplify because there are no like terms. Do you need to factor this?? or are you just being asked to combine like terms. If you have to factor it. that is possible. Let me know.
February 20, 2013

Math
You are welcome.
February 20, 2013

Math
Yes. Very good.
February 20, 2013

Math
of means multiply Multiply 3/5 times 65
February 20, 2013

math
We can start to take it apart using the law of logs. ln x^3 + 1/2 ln(y^4 - z^10) 3lnx + 1/2 (4)(lny)-1/2 (10) ln z Can you finish from here. Remember exponents become multiplications Multiplications can be changed to additions and Divisions can be changed to subtractions.
February 20, 2013

math
Let t = ten's digit Let x = one's digit t + x = 13 2t= x-1 or 2t+1 = x You can substitue for "x" t + 2t + 1 = 13 3t = 12 t = 4 find x = 9 so we have 49
February 20, 2013

Math
Right. The radius is 2.5 So you can see that the diameter is double the radius. or you can say the radius is 1/2 the diameter.
February 20, 2013

Math
The diameter is the distance across the circle and the radius is the distance from the center of the circle to the edge of the circle. I will be happy to check your answer.
February 20, 2013

Math
50% right.
February 20, 2013

Math
You can add the whole numbers and you can add the fractions. When you get 3/3 that can be changed to 1 which can be added to the sum of your whole numbers. I will check your answer.
February 20, 2013

sci
Force = G times (m1 x m2)/r^2 If you double the masses your have 4 times the force. since the distance is the same and the "G" is a constant.
February 20, 2013

math
You are welcome.
February 20, 2013

math
Correct. You have to be careful with the signs.
February 20, 2013

math
-3x -3x = -6x this is the same as -3x + -3x + -6x You are right, but missing the middle term. -3x + 3x = 0 that isn't what you had here.
February 20, 2013

math
You have to combine like terms. When you add you keep the variable(letter) with its exponent and and the coefficients (numbers in front) 3x + 5x = 8x You are going to combine your x^2 terms your x terms and your constants. Show me your answer and I will check it.
February 20, 2013

math
Right. Glad it makes sense.
February 20, 2013

math
NO.. p/8 40/8
February 20, 2013

math
no, you would divide. Let's say the perimeter is 40? Would it make sense to say a side is 320 or does it makes sense to say a side is 5?
February 20, 2013

math
no we have p = perimeter You want to use p and 8. Do you multiply or divide?
February 20, 2013

math
An octagon has 8 sides. Perimeter = 8 times length of 1 side.
February 20, 2013

math
Supplements add to 180 What is angle z? Complements add to 90. what is the complement of z?
February 20, 2013

math
18 miles is right.
February 20, 2013

math
you can cover 3 miles every 20 minutes You are walking for 12o minutes. 3 miles/20 minutes = x miles/120 minutes. The denominator of 120 is 6 times bigger than the denominator of 20. so you should go 6 times farther.
February 20, 2013

math
walking rate = 1/20 jogging rate = 3times or 3miles/20 minutes 2 hours = 120 minutes Can you finish from here?
February 20, 2013

computer science
I bet you could google this.
February 20, 2013

Math
tens digit + ones digit = 11 tens digit = 3 + ones digit t + x = 11 t = 3 + x substitute: 3 + x + x =11 3 + 2x = 11 Solve for x which represents the one's digit. Then find the tens digit.
February 20, 2013

math
This is a right triangle problem. c^2 = a^2 + b^2 c^2 = 8^2 + 15^2 remember to take the square root in the last step to find c.
February 20, 2013

*math*
I answered earlier. Let x = 0 and find y Let y = 0 and find x. Remember the pairs are written (x,y)
February 20, 2013

Applied Calculus
This is a chain rule. (the derivative of the whole thing times the derivative of what is in the parenth.) first derivative: (1/2)(5) (5t+4)^-1/2 Take the derivative of the above for the second derivative. Take the derivative of that answer again and you will have the 3rd ...
February 20, 2013

OAA math *wolf*
Tell me what you think the answer is...
February 20, 2013

OAA math *wolf*
If x = 0 find y. If y = o find x. That will give you the ordered pairs. Any time you have a MC question, you can check the values in the problem if you are stuck. (x,y) is the correct order in the ordered pairs.
February 20, 2013

Math
I would say recheck her work since the estimate and actual are so different from each other.
February 20, 2013

Math
compare y = x with y = mx+b m = slope What number is in front of the "x" in your equation?
February 20, 2013

college algebra
The best way to do it is using calculus, but you are in college algebra. You are looking for length + width + width = 1000 feet because you don't need any for the river side. L + 2w = 1000 or L = (1000 - 2w) A = lw A = (1000-2w)(w) A = 1000w - 4w^2
February 20, 2013

trigometry
It is always good to draw a picture. You have a right triangle with hypotenuse of 16. The side opposite the angle that you are looking for is 5. If you take the opp/hypotenuse = sine of the angle 5/16 = sin of angle. You can use your calculator to find the value of the angle. ...
February 20, 2013

Algebra
Solve for b? add a -1/6 to both sides of the equation. You have to combine -1/6 and -1/3 You need a common denomiator of 6.
February 20, 2013

Applied Calculus
I agree with your first derivative. Now, start with 10/(7x+10)^2 and take the derivative again. Denom times deriv of numerator = 0 since deriv of 10 = 0 minus the numer time the deriv of the denomin. - 10(2(7x+10)7) this is the chain rule You need to simplify this expression ...
February 20, 2013

Math - Help with radicals please
It seems that you need a lesson in everything you need to know about radicals. #3 You can't combine radicals unless they are the same like 3x - 2x = 1x So yo have to write 75 xy as 25(3xy) you can take the square root of 25 with the 3xy left under the radical. for 27x^3y ...
February 20, 2013

Math - Help with radicals please
do you have any idea how to do any of these or where to start??
February 20, 2013

Algebra
I didn't get A, Did you make a Venn Diagram with two overlapping circles. The 31 goes in the overlap. for band alone subtract the 31 from 89. For the sports alone subtract the 31 from 215. Add up all of the numbers in the 3 parts of the circles and subtract from 464.
February 20, 2013

Math
Negative signs and subtraction signs are really the same thing. You can write -8 - 6 negative 8 subtract 6 which is the same thing as writing -8 + -6 negative eight plus negative 6. In both cases, you get a -14 as the answer.
February 20, 2013

Math
17 -12 is a subtraction problem 4w -w is a subtraction problem.
February 20, 2013

Math math
Do you mean 3 hundred plus 5 tens? 350
February 20, 2013

Math
a^2 + b^2 = c^2 17^2 + 26^2 = c^2
February 20, 2013

Physics
12 mg per kg. so multiply 12 times 73 and this gives you the answer in mg. convert to kilograms we know 1000 g = 1 kg we also know 1000 mg = 1 gram
February 20, 2013

CALCULUS
I will give you a hint. The derivative of e^x is e^x.
February 20, 2013

Math
See my anwer to the previous question. You should be able to do it.
February 20, 2013

Calculus
derivative of e^x is e^x Derivative of e^xk is k e^xk Can you finish it from here?
February 20, 2013

chemistry
You have to find the volume of the block by multiplying L x W x H One you have the volume, you can find the density. density = mass/volume Your answer should be in grams/cm^3
February 20, 2013

World History
I like your answer. It also lead to the civil war.
February 20, 2013

World History
Abolition is the elimination of slavery in this country. Think about the significance of no slaves to the plantation owners and about the freedom to the slaves themselves.
February 20, 2013

math
You have 4 chances out of 7 of getting a blue marble.
February 20, 2013

electronic logic
You need to look up these systems.
February 20, 2013

algebra 2
Start by taking the ratio of 800/2000 reduce it to 2/5 or .4 multiply 800 times .4 = 320 next multiply 320 times .4 and continue until you get to the 6th term.
February 20, 2013

Business
These look pretty obvious to me. For example b - having merchandise in many different sizes and colors will give shoppers more choice which will lead to more sales.
February 20, 2013

algebra
you need an improper fraction. 5/4 times 28 gives you the exact answer. an estimate is between 28 and 56.
February 19, 2013

US HISTORY
WHAT WAS THE PANIC OF 1887
February 19, 2013

us history
what was his war
February 19, 2013

us history
i still cant find why in their
February 19, 2013

us history
explain jacksons war on the bank
February 19, 2013

math
density = mass/volume density = 360g/36 ml
February 19, 2013

algebra
You solve this by creating a Venn Diagram with 3 intersecting circles. Begin by putting the 4 where the 3 circles intersect. When you are done, add up each part of all of the circles and you should get 70. If you get less than 70 that means customers purchased none of these ...
February 19, 2013

reading
That is what I think.
February 19, 2013

reading
Read this carefully and think about what you would do if you were afraid.. He was looking around, then what did he do?
February 19, 2013

math
log(base 4) 4^6 = x convert to exponents 4^x = 4^6 so x =6 which means the expression = 6
February 19, 2013

math
You need to get a common denominator of 35. Multiply the top and bottom of 3/5 by 7 and multiply the top and bottom of 4/7 by 5. Then, keep the denominator and subtract the numerators to give you the difference in weights.
February 19, 2013

math
Divide 24 into 80 to give you the number of packages. You will need to round up to get the correct answer. There will be more than 80 pencils, but the teacher will have to buy that number of packages to be sure to have enough.
February 19, 2013

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