# Posts by JJ

Total # Posts: 1,109

**Math 0098**

Do you have numbers for this problem?

**Calculus**

The derivative of a product. The rule is: the first times the derivative of the second PLUS the second times the derivative of the first. simplify your answer. The derivative of the first: 4x-2 The derivative of the second -3x^-4 -8x^-5 Can you finish with these hints?

**Algebra II**

Use the slope formula. m = (x2-x1)/(y2-y1) 2 = (2 -1)/(y-3) Multiply (y-3) times each side of the equation. Simplify and solve for y.

**math**

n = ist number n+1 = second number the sum: n + n + 1 or 2n + 1 reciprocal we would want 1/(2n+1) and that should equal 11/30 Set the two fractions equal to each other Cross multiply and then solve for n. then find n+1

**math**

12/60 = 1/5 of an hour 1 tank can be filled in 1/5 of an hour your rate is 5 tanks per hour 20/60 = 1/3 of an hour The tank can be filled in 1/3 of an hour. your rate is 3 tanks per hour (5 tanks per hour)time + (3 tanks per hour)time = 1 tank filled 5t + 3t = 1 t =1/8 of an ...

**Calculus**

This is derivative of a division (fraction. the rule is the denominator times the derivative of the numerator - the numerator times the derivative of the denominator. ALL OVER the denominator squared. The denominator of the derivative is the easy part. It is just (t^4 -2)^2 ...

**Math**

a. equal number of each Combinations again.. architects 4!/(2!2!) engineers 6!/(2!4!) electricians 9!/(2!7!) b. remove the 2 engineers from the choices which would leave 4 architechts, 4 engineers and 9 electricians Now, we have 17 to choose from to make a group of 6. 17!/(6! ...

**Math**

Remember an odd number has to end with 1, 3, 5, 7, or 9 An even number is divisible by 2 and has to end in 0, 2, 4, 6, or 8

**Math ASAP**

24 is the original perimeter. P = 2l + 2w Just wanted to add that information. You could also just multiply the 24 times 1.5 to get the new perimeter of 36 and then take the difference. The math is a little easier.

**Math**

This is a combination Do you know that 5! = 5x4x3x2x1 =120?? from the 10 people you will choose 7 10! divided by (7!3!) Once you have your group of 7 then there are only 3 people left to put into the group of 3. That is only 1 way. I think the answer is 4320 ways. for 3 groups...

**Math**

I think you are asking for the sum of a series. You are starting with 2 and there is a difference of 3. There is a formula to calculate this total and it won't be 77.

**Chemistry**

Supersaturated solutions are unstable because they are holding more solute than is normally possible. All it takes is for a tiny bit to be added and it begins to crystallize. If you think of a normal salt/water solution. You can get just so much salt to dissolve in water at a ...

**math**

I am assuming that you want to reduce the height proportionally to reducing the width. You made the width 1/2 as big when you took it from 6" to 3 ". You divided 6 by 2 to get 3. What do you think you should do to the 14"?

**math**

4/16 getting a red the first time No replacement 3/15 getting a red the second time Multiply these probabilities together.

**physics**

100/9.86 with give you his velocity running. 100/90.9 will give you his velocity walking. Average the two to get his average velocity in m/sec for the 200 m.

**statistics**

You are looking for the area under a normal curve between -1.5 and 1.5 standard deviations. Use a calculator to find this area or Use a z-table.

**US HISTORY**

WHAT HAPPENED AT THE CVITY OF GONZALES

**US HISTORY**

Do a google search of the ALAMO

**US HISTORY**

WHAT PROBLEMS DID THE AMERICANS AND THE MEXICANS HAVE WITH EACH OTHER IN TEXAS

**US HSITORY**

HOW DID MEXICAN INDEPENDENCE CHANGE TEXAS

**Composition**

You need to write your revision and then someone here will check it for you.

**statistics**

We need to know some other information. Like the mean and standard deviation for these scores. subtract the mean from 37.5 and divide by the standard deviation to get a z-score. do the same for 39. Use a z-table to find the percentage of scores that will be between the two ...

**math**

5/97 divide 5 by 97 to get a decimal answer. Then move the decimal point two places to ther right and include a % sign.

**math**

You have to know how many pints in a quart. 4 cups in a quart - Right? would there be 2 pints in a quart? If so, multiply that number times the quarts to get number of pints then you can add up the 3 values.

**math**

So.. is A times 0.25 = B If so, then A = 56/0.25 or is A/B = 0.25 If so, then A = B times 0.25 which gives us A = 56 times 0.25

**Math**

I am getting x^2+2x+9 with no remainder Did you divide x - 2 intot x^3 + 0x^2 + 5x -18 You need to put in the 0x^2 because you have the missing x^2 term. since you are dividing by x-2 we cannot have x-2 =0 because division by zero is undefined. So.. we would not want x to be 2...

**physics**

Kinetic Energy = 1/2 times m v^2 1.00 x 10^-19 = (1/2)(1.673x10^-27)v^2 solve for v^2 then take the square root to get v.

**Math**

You need to get common denominators. (9)(8(7) will be the common denominator. multipy the numerator of the 7/9 fraction by (8)(6) and multily the denominator by the same thing. do something similar to the other 2 fractions then compare their numerators.

**Math**

Find out how many degrees is in each slice. Divide that answer into 360 which is the number of degrees in the circle and then you will find the number of slices. You could set up a proportion: 72/3 = 360/?

**Algebra**

factor a 2 out of the 2y-4 in the numerator. then you can cancel out like factors. Can you finish from here?

**MATH**

No.. they said he makes $7 per day.

**MATH**

This seems a little odd to me. if he is paid $7 per day and works 5 days, he should make $35. Is something missing from the question or is this a question where they want you to ignore the extra information?

**Science**

Yes, it is b. the other are between the same elements so those are nonpolar covalent.

**Math**

A circle has 360 degrees for 18 parts divide 360 by 18 for 5 parts divide 360/5

**Math**

50.00 - $18.42 That will tell us how much more he has to earn. Then you would divide this by 2 to get the amount per week.

**math**

I just answered to on of your earlier posts. Check it out.

**math**

120 cards per drawer and 2/3 are baseball. He has 240/3 = 80 baseball cards per drawer. He actually has 240 baseball cards right? because he has 3 drawers. He will trade 1/4 of the 240 = Can you finish it?

**geometry**

Perpendiculars form right angles which are = to 90 degrees.

**math**

Yes

**math**

2/8 + 3/8 = 5/8 these are pink and white. How many are purple? 8/8 - 5/8 = ?

**math**

1/4 of the t-shirts are pink There are 3/4 of the shirts remaining. 1/2 of these 3/4 are white. so we multiply to get 3/8 the rest are purple. we know 1/4 are pink and 3/8 are white. Get a common denominator and add these two fractions and then subtract from 1 which can be ...

**math**

It is math that you do in your head without paper or pencil or a calculator.

**math**

x y 4 -1 5 -2 6 -3 7 -4 The rule seems to be as x increases by 1, y decreases by 1

**Math Gr.12 (Calculus)**

What are you doing with it? Are you trying to solve for x? If so, you have to subtract 3 from both sides so one side = 0 0 = 6x^2 -2x - 11 If this won't factor, you can use the quadratic equation to solve for x. -b +/- (the square root of (b^2-4ac)) all of this divided be 2a.

**MATH**

9x^2 + 5x - 4 the AC method Multiply the 9 times -4 You have -36 think of factors that will multiple to equal -36 but add to equal the middle number 5. 36 times -1 no 9 times -4 yes Sometimes it takes awhile to find the right numbers. Once you do, you write them and -4x + 9x ...

**MATH**

y^3 + y^2 - 4y - 4 factor by grouping the first two and the last two. Be careful with the second grouping because of the _(-) in front of the 4y. (y^3 +y^2) + (-4y -4) Take out the common factors: y^2(y+1) + -4(y+1) See the y+1? Write that down once and your other factor is ...

**math**

Did they ask how much would they sell the ice for? or what is the profit? the profit is $225 and the total price they will sellit for is $975 Read the question again carefully.

**math**

$225 is the profit. they will sell the ice for $750 + 225 which is $975 total.

**math**

Did you read my answer to her questions? We start by dividing 1500 by 5 lbs per bag to get the number of bags which is 300 Since each bag costs 2.50 and we have 300 of them. we paid how much? Once you get that answer multiply by 30% or .30 to get the profit.

**math**

It is Megan... write below us.

**math**

If you look before this note. You will see your problem listed below. If you don't see it let me know and I will do it again.

**math**

I did answer this one earlier.

**math**

A circle has 360 degrees. The angle for each slice should be 36 degrees. Can you figure out the angle for 3 slices?

**math**

Okay.. just think about it a little more.

**math**

1500 divided by 5 = 300 You wrote that step backwards. 300 X 2.50 = 750 Why did you subtract 120 and 36?? that isn't needed? Multiply 750 x .3 is correct $225 is the answer. What part is confusing. if you have 1500 lbs and each bag weighs 5 lbs. YOU must have 300 lbs. ...

**math**

It costs $2.50 per bag and you have 300 bags. You have to multiply them. Does that make sense?

**math**

5 lbs per bag... How bags will you have? 1500/5 = 300 bags how much does she pay for the 300 bags? Can you do this step? If so, the next step is just multiplying that answer by .3 to find the profit.

**trig**

tan x = opposite/adjacent cot x = adjacent/opposite they are reciprocals of each other. tan x = 1/cot x Can you finish from here?

**Algebra**

You are welcome.

**Algebra**

56/(56+x) = 70/100 silver/(silver + additive) silver / total weight is 70% or 70/100 56/(56+x) = .7 Cross multiply and solve for x

**Algebra**

I guess it can be D.. but I still like A better.

**Algebra**

I agree

**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

**math**

You have to get common denominators. Try 21. Then subtract.

**Algebra**

You are welcome.

**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...

**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.

**Math**

You are welcome.

**Math**

Jar 1 = x Jar 2 =y x = 4+ 2y x + y = 712 so 4 + 2y + y =712 Can you finish from here?

**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.

**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.

**math $$**

Yes, it is D.

**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 ...

**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

**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)

**Math**

You are looking for a number that both 8 and 12 will go into which is 24.

**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.

**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 ...

**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 ...

**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? ...

**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 ...

**stats**

.60 = republ .40 = democ rep x dem .6 x .4

**Math**

Divide both sides by 7 and that will isolate y.

**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.

**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.

**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

**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...

**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

**Math**

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

**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.

**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?

**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

**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.

**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.

**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 ...

**science**

Work = force x distance 286J = Force x 1.3 meters

**Pharmacy Calculaions**

I don't see the formula.

**science**

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

**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.

**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.