Sunday
December 21, 2014

Posts by JJ


Total # Posts: 929

chemistry
You have to find the mass of 1 mole first. Then you will know what fraction of a mole you are working with one mole has 5 carbons your fraction of a mole has ? carbons
February 21, 2013

math
You have to get common denominators. Try 21. Then subtract.
February 21, 2013

Algebra
You are welcome.
February 21, 2013

Algebra
I get 34... 20 liked pepperoni only, 26 like banana peppers only. I got these numbers by subtracting the 5 that liked both I have a total of 51 students that means there were 14 others that liked neither. I added the 14 that liked neither with the 20 that liked pepperoni only...
February 21, 2013

math
This sounds like a right triangle c^2 = a^2 + b^2 You have the two sides and are missing the hypotenuse which is the shortest length between two points. c^2 = 4^2 + 7^2 You square each number add them and then take the square root to find c.
February 21, 2013

Math
You are welcome.
February 21, 2013

Math
Jar 1 = x Jar 2 =y x = 4+ 2y x + y = 712 so 4 + 2y + y =712 Can you finish from here?
February 21, 2013

math
Percent increase can be tricky. find 16,200 - 14,500 that gives you the increase. to find % increase. divide that answer by the original amount which is $14,500. you will get at decimal. Move the decimal to the right 2 places and add the % sign.
February 21, 2013

math
.26 (x) = 350 if you use algebra?? divide both sides by .26 If you don't use algebra, I can show you another way.
February 21, 2013

math $$
Yes, it is D.
February 21, 2013

landmarks
This isn't as bad as you think 28 minimum and 34 max. Your numbers have to be between 28 and 34 with a median of 30 28 30 34 You need an equal number of entries above and below 30 with 29 being a mode.. it means you can have multiple entries 28 29 29 29 29 30 30 31 32 33 ...
February 21, 2013

Math
You need to get common denominators so that you can relate each fraction to the other ones. Another way would be to write each as a decimal. The first 3/5 = .6
February 21, 2013

math $$
Let x = 0 You have 5(0) - 2y = 10 so -2y = 10 divide both sides by -2 to find y. Your ordered pair is (0, y) Do the same for y = 0 5 x - 2(0) = 10 5x = 10 solve for x and your ordered pair is (x, 0)
February 21, 2013

Math
You are looking for a number that both 8 and 12 will go into which is 24.
February 21, 2013

MATH PLZ
Try some examples. + 8 - (-8) Remember when you subtract, you add the opposite in algebra +8 + (+8) = 16 + 10 - (-4) = " Look for a pattern.
February 21, 2013

please help with geometry - dilation
A square with an area of 4 has to have all sides equal to 2. Right? If I increase by a factor of k that means multiply 2 times k My area is 2k times 2k = 4k^2 I would set this equal to 9 I am getting 3/2 for the value of k -3/2 is another possibility, but we have to discount ...
February 21, 2013

algebra
Checking with what I think you have in your problem 7^3 times 7^2 times 8^5 in the numerator? If so you can simplify to 7^5 times 8^5 in the numerator The denominator: 8^4 times 7 times 8^-7 if so you can simplify the denominator to 8^-3 times 7 7^5 times 8^5 divided by 8^-3 ...
February 21, 2013

algebra
I am having trouble understanding what you mean for part a. Is the x a variable or are you writing it as a times sign to indicate multiplication? for b I am a little confused too. a raised to the -2 b raised to the 4 c raised to the 3 should everything in the ( ) be squared? ...
February 21, 2013

Math plz fast i really need it
For the first part, you really need to make a table to show all of the possible sums I suggest making a table with 1 -6 across the top and 1-6 down the side.. Then fill in the table by adding the die. 1,1 = 2 1, 2 = 3 You may be able to find a table like this in your book or ...
February 21, 2013

stats
.60 = republ .40 = democ rep x dem .6 x .4
February 21, 2013

Math
Divide both sides by 7 and that will isolate y.
February 21, 2013

Calculus
Take the derivative of the function because the derivative is equal to the slope of the tangent line. a horizontal line has a slope of zero. Set you derivative = 0 and solve for x. That should give you the correct value of x.
February 21, 2013

math
148 drachma = 1 dollar he spent 10 dollars so he should have 10 = 148 drachma. since the 3 items are priced the same just divide the above answer by 3.
February 21, 2013

Math
I meant to say s and h. You could do that which issubstitution or you could use the addition/elimination method -6h -6s <= 216 6h +8s >= 245 2s =461
February 21, 2013

Math
hours: h + s < or equal to 36 6h + 8s > or equal to 245 You can solve these just like you would equations. How would you solve h + s = 36 6h + 8s = 245 Multiply the first equation by -6 and then combine the equations to eliminate the x and solve for y. Substitute back in...
February 21, 2013

Math
You really need to know how to do it yourself. I can give you a hint. x >= 10 y>= 21 14x + 2y >= 300 (for part C just substitute here) so.. you have to graph x = 10 y = 21 14x + 2y = 300
February 21, 2013

Math
This is similiar to the one above. Try it based on those hints and I will be happy to check it for you.
February 21, 2013

Engineering Econonmy
To determine what you would have at the end of 3 or 5 years use: The following formula works for compounded annually. future value = P(1+r)^n for 1500 and 3 years at 8% 1500(1+.08)^3 Do this calculation and a similar one for the 5 year period and then compare.
February 21, 2013

life orientant
When a teenager has a baby... what happens? These are things to think about... how does this impact the community? Who pays the hospital bills? Who pays for diapers, formula, etc.? Who pays for the doctor? Can the teenager go back to school? Who watches the baby?
February 21, 2013

math
You have to change them all to decimal form to compare them. I would be happy to check your answer. For example 3/5 = .6
February 21, 2013

Math
5x(10) + 3 = 24 50x + 3 = 24 subtract 3 from both sides and then divide by 50 to find x. Be sure to check your answer by putting the value of x into the original equation.
February 21, 2013

pre-algebra
The mode is the number that is listed the most often. I don't see any number repeated. So, there is no mode.
February 21, 2013

maths
42 books have a mass of 8.4 kg. 8.4 kg/42 books = ?? kg/12 books This is the original proportion. Solve by dividing 42 into 8.4 That will give you the mass per book. Next you can find the mass of 12 books by multiplying 12 times the answer for the mass of 1 book. Then you can ...
February 21, 2013

science
Work = force x distance 286J = Force x 1.3 meters
February 21, 2013

Pharmacy Calculaions
I don't see the formula.
February 21, 2013

science
The force is due to gravity. Force = mass x g Force = 80 kg x 9.8 m/sec^2 answer is in newtons
February 21, 2013

math
Substitute for the values -5(5)^2 + 5(-3)^3 do the exponents first multiply second then add. I will be happy to check your answer.
February 21, 2013

math
You need to subtract 1/4 y from both sides. You need a common denominator of 28 before you can combine the fractions -8 will be alone with a frction in front of the y. Multiply both sides by the reciprocal of the fraction to solve for y. I will be happy to check your answer.
February 21, 2013

math
You do this the same way as the one above that I gave you a hint on. I will be happy to check your answer.
February 21, 2013

math
Add 1 to both sides then multiply both sides by 5/6 to solve for x. I will be happy to check your answer.
February 21, 2013

math
Subtract 1/4 from both sides. You will need to change 5 to 20/4 Next multiply both sides by 3 to solve for x. I will be happy to check your answer.
February 21, 2013

math
Eight subtracted from means something - 8 six times a number means 6x is means = can you write the equation?
February 21, 2013

math
This is easy. Just divide both sides by 14. 14x/14 is x on one side. what will you have on the other side ?
February 21, 2013

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

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