# Posts by jj

Total # Posts: 1,060

**algebra**

If he is trying to make 15% from 15% then he doesn't need any water at all. He can just use the sulfuric acid directly. If they want 10 liters, then he needs 10 liters of the sulfuric acid. But.. is this really the question or did you mistype something?

**College Algebra**

I know how to do this with calculus, but algebraically it starts the same way. L + 2W = 800 L = 800 - 2w A = LW A= (800-2w)w A = 800w - 2w^2 Take the derivative: 800 -4w 800 -4w = 0 to find max. 800 = 4w 200 =w l = 400

**physics**

d = rt 18 = (51.6)(t) Solve for t.

**physics**

a =v/t a = 80/20 = 4 m/sec/sec north

**math**

The second equation can be rewritten as log(x-2y) = 2^5 The first equation is more complicated because you have different bases. You need to chane base 4 to base 2 by using the rule that allows for base changes. Once you do this, you can use the Law of Logs to combine the left...

**english**

Bias means it is one-sided, unfair and trying to make you agree with their opinion. Unbiased means there is no slant to it and they just are reporting facts and you can't really tell the writers position.

**English**

They don't sound correct either.

**Algebra**

Solve for y in each case. Be sure to write the equations in the forms of y = mx+b m = slope. If the slopes are the same, then the lines are parallel.

**college algebra**

(3,1) is the vertex of the parabola. (1,9) and (5,9) y = ax^2 + bx + c Substitue in the point (3,1) 1 = a(9) +b(3) +c Do the same for (1,9) and then again for (5,9) You will have 3 equations and 3 variables. Solve for a, b, c. There is also a formula to find the equation using...

**Math**

Is the calculus? If so, take the derivative of y which would be 4x^3 - 3x^2-2x -1 Let x =1 to find the slope 4-3-2-1 = m = -2 find the value of y when x = 1 You will then have the slope and a point to use to find the equation using y=mx+b

**math**

I agree with A, B,C. is D -3.744 with nothing after it. If so, it is rational.

**Math algebra**

length is L = W + 8 Area is length times width. 560 = (w+8)w 560 = w^2 + 8w 0 = w^2 + 8w - 560 factor to solve for w. (discard negative values) Then substitute to find L. Be sure to check by multiplying to be sure you get the 560 in^2.

**algebra story problem**

I just answered this one above for someone that posted as "college student"

**math algebra**

length is twice the width L = 2W area is length times width. 72 = (2w(w) 72 = 2w^2 divide both sides by 2 to get 36 and then take the square root of 36 to find "w". double that value to find the length. Check by multiplying l times w to see if you get 72.

**statistics**

14 x 13 x 12 x 11x 10 This is the counting principle. This Assumes choosing: ABCDE is different from ACDEB If you really want a combination you can use: 14! divided by the product of 5!times 9! 5! means 5x4x3x2x1 there will be fewer combinations because ABCDE is the same as ...

**Math**

Take the 20th root of each side then subtract 1 from both sides to solve for g.

**math**

AP Calculus.

**Algebra**

No, you are missing the middle term You need 3x(-4) + 3x(-4) = -24x (3x+4)(3x-4) = 9x^2 -16 This is the case where there wouldn't be a middle term.

**Algebra**

Area is length times width (2w+4)(w) Multiply and you will get the polynomial

**algebra 1**

you multiply 25(9/5) a short cut is to divide 25 by 5 first to get 5 and then multiply times 9 to get the 45 and then add the 32

**Science**

Do a google search for Bermuda Triangle. You will find tons of interesting information which will make good questions.

**Math**

Precision is related to how close you are to the exact measurement. You are most accurate with 21/32 inches.

**business**

I think you might be able to google search corporate social marketing.

**math**

< direction means less than. See it looks like a weird l. > is greater than. If you are using a number line, you can just put a colored in circle on the -5 because it is or equal to and then show a line all the way to the left.

**Math**

2x - 1 x = the cost of 1 jar of honey.

**math**

Since half the class scored 91, the median should be around 91. When you average the low scores, especially the 7, it should bring the mean down to be lower than the median.

**ALG 2 PLZ PLZ HELP**

2) 4x = x - 78 3) b + r = 330 and b = r -14 These could be combinte by replacing the b with r - 14 r - 14 + r= 330 4) A = E + 6 A + E = 32 5) C = 3M C + M = 52 6) n = 1st integer, n + 1 = 2nd and n+2 = the 3rd integer sum is: n + n + 1 + n + 2= 105 7. Consecutive odd or ...

**math**

To solve by elimination, you need x and y on the same side of the equation. For the first one, subtract 5y from both sides to get 4x - 5y = 24 For the second one, subtract 4y from both sides to get 5x - 4y = 21 You want to add these two equations to eliminate one variable. You...

**Math**

1/100 divided by 10 is the same as multiplying by 1/10 That would give us 1/1000 which is a thousandth.

**math**

80 photos with 4 per page means she needs 20 pages. Can you finish the problem from here?

**math**

It is correct unless they want the number written as a mixed number and not an improper fraction. You could divide 46 by 15 and that would be 3 with 1/15 left over.

**statistics**

I tend to think it is true since 220/400 is more than 50% and it was a random sample. If a sample is truly random that we can consider it to be representative of the population. If they had asked people coming out of a pizza shop, then I would say no.

**Algebra 2**

a. Since the miles are equal, then you can just average your gas mileage. b. This will be a weighted average. Say you travel 100 miles. 60(30) + 40 (25) = Divide that answer by 100.

**maths**

any equation in the from of y=mx+b, you can find the y-intercept as (0,b). or sometimes, it is just written as b. The equation you gave is in this format. Now, can you find the f-intercept?

**Math**

Volume has 3 measurements - length, width and height that is why we have cubic feet also written as ft^3.

**Algebra 2**

I think there is an error is the statement of the problem. Serena paid $20.20 for 36 folders. Right there you could find out the price of the folders. Should it say $20.20 for 36 folders and ??? rulers??

**math**

Just 500 + 50 will give you the combined speed. a tail wind always adds, while a head wind slows you down.

**english**

can divining be replaced by doubting or realizing

**Algebra**

Then you have to set each factor equal to zero and solve for m. I actually have another way to factor instead of trial and erro. you multiply the 6 times -14 to get -84 Then you think of a two numbers that multiply to =-84 and add up to be -5 They are -12 plus 7 rewrite as 6m^...

**english**

the rest of the sentencer is to fill the cuff with air

**english**

Then, the doctor pumps the rubber ball does the comma go after ball or pumps or after then with a semi colin after ball

**english**

how should this sentence be written: with stethoscope in place, he or she tightens the valve. does the comma go after stethescope or is their no need of comma

**english**

i think i put it out wrong (jacob and jacob was discussing) the argument presented during the debate. the part in the parenthesis is written as jacob and jacob discussed

**english**

(jacob and jacob was discussing) the rgument during the debate. is the underlined corrected as jacob and jacob discussed

**english**

Luis paints with watercolors now, but last year (he used) only oil paints is the underlined correct

**english**

does (any of the students want) to sign up for knitting class this fall is the right way do any of the students want

**MS Sue**

i gave u my answrs r my answes correct

**MS Sue**

can you plz check my english answers

**english**

is it their

**english**

is it indirect object

**english**

ellen brought her (uncle) a picture of the mountains is the parenthesis the subject the direct object indirect object or predicartive nominative

**englsih**

is it adverb clause

**englsih**

we saw nelson (skating in the park) the parenthesis is it idependent clause gerund phrase or adverb clause or noun clause

**english**

is it dependent clause

**english**

(when you get to the corner,) turn right is the parenthesis idependent clause or dependent clause or ajd clause or adverb clause

**englsih**

1.Where are (the aronsons) going for vacation is the underlined a subject direct indirect object or predicate nominative

**math**

Multiply the -9 using the distributive law. -9w + 27 = 8w -8 You have a couple choices here, but I would add 9w to both sides. This cancel with -9w leaving 27 = 17w -8 Add 8 to both sides and then divide both sides by 8 to solve for w. Can you finish from here?

**math**

r = litres of red paint w = litres of white paint r + w = 28 r/w = 2/5 so: 5r = 2w which leads to r = (2/5)(w) Replace r in the first equation with the (2/5)(w) that will give you 7/5 w = 28 Can you finish from here?

**math**

x + y =90 x-y = 18 Add the two equations together which will eliminate y. Solve for x and then substitute the value for x into the first equation to find y. check the x and y values in both equations to be sure you are correct.

**Math**

If the floor has an area of 52, it must be in square yards. To find how much she needs multiply 52 times 3/4 since she only wants to cover 3/4 of the floor. Now, is there a second part of the question asking for how many pieces of 4 square yards does she need? If so, they ...

**math**

degree 4 begins with x^4 trinomial means 3 terms so you can add two more terms. It doesn't matter if it is x^3, x^2, or x or a constant. With a greatest common factor of 1 means that the the coefficients should be written in such a way that they don't have a factor in ...

**math**

You need to use the order of operations here which is a little difficult given how we have to write the math at this site. I am understanding that 20(-2-3) is the numerator which would be 20(-5) or -100 The denominator is -3[4 -(-2)] - 4(-3) -3 [4+2] -4(-3) -3(6) -4(-3) -18 + ...

**math**

in 2 hours the car will travel 200 km. 15 minutes/60 minutes in an hour = 1/4 hour so multiply 1/4 times 200 Can you finish from here?

**Math Probability**

rolling a die with 1 - 6 on each side. then rolling another die There are 36 possible outcomes. When will you get an 11 or great 5-6 or 6-5 or 6-6 That is 3 chances out of 36. Can you finish the problem from here?

**Statistics**

Usually, the rule is to go to the 4th place and it is 5 or higher round up. The answer would be .206 There is also another rule that says to round up when there is a 5 only if the answer will be even. Again, .206 would be the answer. Using either rule we get .206

**Math**

There are 16 cookies in the jar, Since there are 4 choc chips you have 4/16 or 1/4 to get a choc chip You have to multiply 1/4 times the chance of getting a second choc. chip. Since you aren't replacing, you now have 3/15 chances since you have to assume you got the choc. ...

**math**

Suppose you used 2 cups every time you ate pancakes, you would divide 48 cups by the 2 cups. Right? This is a division problem you will divide 48 by 2/3 which is the same thing as multiplying by 3/2, so you will multiply 48 times 3/2 Since you are using less than 1 cup each ...

**Algebra 2**

your divisior is -6 your dividend is: 1 3 -28 -62 You bring down the 1 and multiply by -6 3 -28 -62 1 -6 Then you bring down the -3 and multiply by -16 compane the 48 with the -28, etc. can you do the rest from here? You reassign the variables starting with x^2, x, constant ...

**statistics**

25/125 gives the percentage that may be bad. Multiply that % times the 350 batteries.

**statistics**

95% confidence interval indicates that you have 5% outside the confidence interval and 2.5% on either side. This is an area of .025. You can use a calculator or a t-table to find the critical value. Multiply that value times the standard deviation. add this value to the mean ...

**math**

Multiply (2y+7)(2y+7) It is fine to divide both sides by 3 first, that will make the numbers a little smaller. You will have (2y+7)(2y+7) = 27 After multiplying, you should have 3 terms = 27. Subtract the 27 from both sides so that you will have a trinomial = 0. You can then ...

**math**

first leg = x second leg = x/2 plus 3 area of a triangle is 1/2 times bh 54 = 1/2 times ((x) times ( x/2 + 3)) Can you finish from here?

**algebra**

I am not sure what the problem is exactly. the second row is confusing me.

**algebra**

What is the question? Is it how many do you have to make per hour to finish in time? If so 400 - 225 = ? then divide that answer by the 2 hours.

**Math**

Marshal sleeps 8 hours each day how many hours does Marshal sleep in one week

**english**

and wat is the best way to arrange our steps for using the tool

**english**

how do u find a subject for writng instuctions for using a tool

**math**

Multiply each possible prize times the chance of winning and add them all up. compare that number with $1 to find your expected gain or loss. If the number is larger, you have a gain. If the number is smaller, you have a loss.

**Math**

Your first step is to use the Addition Property to get the variables on the same side of the equation.. If you mean something like 4x + 5 = 6x Add -4x to both sides: 5 = 2x then solve for x.

**math**

Let x = cost of each shirt let y = cost of each pair of pants 4x+3y = $85.50 3x + 5y = $115.00 You can use the Addition/Elimination method to solve this problem. You have to eliminate one of the variables. You can multiply the top equation by -3 and the second equation by 4. ...

**Math**

Somone just asked this question. Look down in the frequent posts with JJ's answer. If you can't find it. Remember there are 7 days in a week and 24 hours in one day.

**Math**

3 times 2 doesn't equal 5 is another way to say it.

**Math**

Sounds like a right triangle. use c^2 = a^2 + b^2 c = 20 a = 3x b = 4x 400 = 9x^2+ 16x^2 solve for x^2 and then take the square root to find x. Multiply this value times the 3 to find one side times the 4 to find the other side.

**3rd grade math**

You have to add 1/3 and 1/5. You need to get a common denominator of 15. after you add the fractions, subtract from 1 for 1 whole pie. (You can write 1 as 15/15). compare your answer with 1/2 to see if it is larger or smaller. (It is always good to be sure the denominators are...

**Chemistry**

I am agreeing with you a negative delta H should be an exothermic reaction.

**Math**

8 hours times 7 days in a week. Is how long he sleeps 24 hours times 7 days = is the number of hours in a week. subtract the sleep time from the total to get hours awake.

**math**

Shirts white and blue - 2 choices brown, black , jeans pants - 3 choices cashmere coat and a windheater - 2 choices You have 2 times 3 times 2

**math**

sorry!!!! I didn't read the question carefully.

**math**

36 - 12 = 24 find the percent of 24/36 You will get a decimal and then have to move it to places to the right to get the answer as a %.

**Math**

The tennis team has 2 players and the Basketball team has 5 players. Is 5 = 3 x 2 ??

**math**

2 is in the hundredth place so it can be written as 2 x 10^-2 6 is in the thousandth place so it can be written as 6 x 10^-3

**Calculus**

n = 0 then A(n) = 1 n = 1 then A(n) = -1 n = 2 then A(n) = 1 n = 3 then A(n) = -1 The graph will continue from 1 to -1 indefinitely. The same thing will happen for n<0.

**Physical Science Help!**

2NO + O2 ---?? NO2 I started this one for you.. What goes in front of the NO2? Second equation On the left you have You have 4 N's 4 H's 2H's or 6 H's 1 Cl 1 Ca 2 O On the right you have 1 Ca 2 Cl 1 N 3 H and 2 H = 5 H 1 O Start by trying to balance the Cl.

**STATISTICS**

You have to find the z-score. 65-50 = 15 then divide by 10 which is z = 1.5 You can then use a z-table or a stat calculator to find the probablity less than 65% Depending on the table, you may want to find the probability of z = 1.5 or greater and then subtract that number ...

**English**

1) sounds okay 2) doesn't sound natural

**Math Word Problem**

Let x = the amount of $2/lb nuts Let y = the amount of the $4/lb nuts He buys triple of x amount so 3y = x This is similar to the first problem you posted. We need to know the value: Our second equation is 2x+ 4y = 32 You can complete this one just like the previous one that ...

**MATH**

Let F = number of Flashlights Let S = number of Sleeping Bags F = 3S since the number of flashlights is three times the number of sleeping bags. The value of the flashlighs is 12F The value of the sleeping bags is 45S The two equations are: F = 3S 12F + 45S = 1215 Substitute ...

**Chem**

Protons have a mass of about 1 and a + charge of 1. It seems like you would need approx. 3.5 protons. Any one else's comment would be appreciated.

**Algebra**

reply. If yo had -3x, the monomial would be degree 1. -3 just has a degree of zero because x^0 = 1 and 1 times -3 = -3

**math**

5 factorial means 5 times 4 times 3 times 2 times 1.