# Posts by jj

Total # Posts: 1,089

Geology
I think it is by the fossils found in rock strata.

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.

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.

physics
A - B = +5 A - C = -16 Do between B-C we must have -21

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?

science
a higher velocity or more mass??? is this is what you are looking for?

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

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

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

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.

finance
Just multiply 7100 times .109 since it is the apr.

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.

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

math
Yes. that is it. I hope it makes sense to you.

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.

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.

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 ...

Science
Could you use a bar graph? One bar for eyes and one bar for ears??

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

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?

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

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.

Math
You are welcome.

Math
Yes. Very good.

Math
of means multiply Multiply 3/5 times 65

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.

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

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.

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.

Math
50% right.

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.

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.

math
You are welcome.

math
Correct. You have to be careful with the signs.

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.

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.

math

math
NO.. p/8 40/8

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?

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

math
An octagon has 8 sides. Perimeter = 8 times length of 1 side.

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

math
18 miles is right.

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.

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

computer science
I bet you could google this.

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.

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.

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

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 ...

OAA math *wolf*
Tell me what you think the answer is...

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.

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

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

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

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. ...

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.

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 ...

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 ...

do you have any idea how to do any of these or where to start??

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.

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.

Math
17 -12 is a subtraction problem 4w -w is a subtraction problem.

Math math
Do you mean 3 hundred plus 5 tens? 350

Math
a^2 + b^2 = c^2 17^2 + 26^2 = c^2

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

CALCULUS
I will give you a hint. The derivative of e^x is e^x.

Math
See my anwer to the previous question. You should be able to do it.

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

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

World History

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.

math
You have 4 chances out of 7 of getting a blue marble.

electronic logic
You need to look up these systems.

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.

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.

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

US HISTORY
WHAT WAS THE PANIC OF 1887

us history
what was his war

us history
i still cant find why in their

us history
explain jacksons war on the bank

math
density = mass/volume density = 360g/36 ml

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 ...

That is what I think.

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

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

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.

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.

math

Statistics
Population parameter percent of all voters who will vote for the candidate the value of the sample statistic would be 35/150 and this could be used to estimate the population parameter.

math
To write an equation you would write: 88 + box = 97 or 88 = 97 - box

math
Begin by factoring out the common factor of 2. That leaves x^2 + x - 42 Factor this trinomial Looks like you will be dealing with 6, 7. One is positive and the other is negative. Remember that distance cannot be measured as a negative number.

Statistic
You have to find z scores first. 66.2-69.0 then divide by 2.8 77.4 - 69.0 then divide by 2.8 Now, you have to find the area between those two z scores. The empirical rule tells you the % between -3 and 3 standard deviations, between -2 and 2 sds and between -1 and 1 standard ...

Math
When comparing fractions, if the denominators are the same.. the larger numerator gives you the larger fraction.

Math
You have to get a common denomiator first then you can compare the numerators. Try for a denominator of 24. this means that you have to multiply the top and bottom of the 6/8 fraction by 3. And multiply the 1/3 (top and bottom) by 8.

Math
You might want to reduce 2/8 to 1/4 first and 4/6 to 2/3 Now, you are compaing 1/4 and 2/3. Can you do this based on my answers to your other two questions?

Math
I think you are missing your second topping. but, the denominators are the same so you can just compare the numerators. Making a picture sometimes helps.

math
This is an order of operation question. My Dear Aunt Sally. Multiplication and Division are done first Addition and Subtraction are done second. Otherwise work from left to right. 3 + 7 - 7 + 3 - 3 x 3 3 + 7 - 7 + 3 - 9 Now just combine from left to right.

You are working with the sum of two squares that you cannot factor and the difference of 2 squares that can be factored. Perhaps your teacher just wants you to show that one factorization.

Algebra
Did you start the problem? You have to begin by factoring.

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