Posts by bobpursley

Total # Posts: 44,829

science
milk comes out of solution forming curds. Could it be the pH of the lemon acidifed the milk? Acid + Milk= curds

HELP plz
A, if the cost is 1.47

Exponets help quick
Abagail, did you see my reading post I sent you last night? If not, I need to repost. Now, if you meant 5*(2x)2) you can add exponents here like this 5*(2x)^2 which of course it 5 *4x^2 or 20x^2 * means multiply, dont use x, as we use x for a variable. / means divide ^ means ...

algebra-math
if the team does not have specific idenity, such as secretary, VP, Pres, etc, ie they are all the same.. 25C4= 25!/(4!*21!)= 25*24*23*22/(4*3*2) =12,650

Math
Is B an empty set?

hayley
If you get lost in the menu, here is the list of exercises: http://mrnussbaum.com/readingpassageindex/ go to the bottom 5+ list.

hayley
Hayley, I have read a number of posts of yours, and noticed two things. a. you worry about grades far too much, after all, we have an entire life ahead of us. Perfection is not on the cards for most of us. b. you have an issue in reading comprehension, in my opinion, getting ...

Physics
momentum = mass*velocity which one is larger?

Algebra 2
s=L-Lr s/L=1+r r= s/L -1

Chemistry
andwhat is are the conditions initially, you gave the volume, but that is all.

math
x^3-8y^3-36xy-216 (x-2y)(x^2+2xy-4y^2)-72y^2-108-216 (6)(4y^2-24y+4y^2)-72y^2-324 check those lines carefully, I did them in my head. If correct, then combine terms...

English 10
There are several versions of the Aztec creation story, it would depend on the one you read. In most, after the first creation, things turned bad for the next four creations, and angry would be the word.

Math
What is 8-10?

Physics0
pressure of water at 50 m; hpg=50*1030*9.8== 504700 pa or 504kpa Now on the water, is atmospheric pressure, so adding that, 605kpa pressure of O2: .21*605kpa=127kpa I can't follow your thinking.

Letter (language) plz help
first q is wrong. What does the writer want to do?

@Writeacher
stop the guessing. You need to take the answers and analyze each one: How does this answer relate to the question?

Physics
I will be happy to critique your thinking on this.

Precalculus 11
Normally, in a polynomial, we write the polynomials in decending powers of the variable.. as in a^3+3a^2 + 6a + 10 so to do that, Your work: 6a^2-15a)/(6a-15a^2) Your work: (3a(2a-5))/(3a(2-5a)) Multiply top & bottom by -1 and this is where your made your error. -(2a-5)/(5a-2)

Focus on the Caregiver
yes, and for key events (calorie intake, fluid intake, hours sleep, ..) it is important somewhere to keep a running graph so one can spot trends easily.

Maths age problems
T=J+6 (T+5)+(J+5)=36 or T+J=26

Precalculus 11
I assume the denominator is (2-x). If so, you can, it makes it neater (2(x-3))/(x-2) Is it necessary? I bet I could find a few middle/high school teachers who would vehemently argue so. If you have one of those, dont argue, just say thanks, I didn't know that. It is not ...

Precalculus 11
No. However you could do it that way, but that changes the sign of the second part of the numerator, as well as the first term. What you are fundamentally forgetting, that you are not multiplying the numerator in the first term: you are multiplying the first term by (4x/4x). ...

science
I suspect it was twice as long as it took to fall 98m. time to fall 98m 98=1/2 g t^2 t= sqrt(2*98/9.8) so double that, and you have it.

Math
what is 60+180?

psycology
Well, B, C, and D are obviously wrong. Does that help? On A, "Explore" goes two ways: what the client perceives, and what the counselor perceives. To be effective, counselors have to know deep in themselves, and how their own "stuff" affects what they ...

physics
work this out with conservation of momentum, the atomic mass of the alpha is 4amu

Physics
E=mgh=kg*m/s^2*m= kg*m^2/s^2= joule so the joule is a "derived" unit, that is, it is not a fundamental unit.

Math
Eunice. How can I tell? I have no idea what the graph indicates.

Math
I dont have the graph, but you get average by taking days missed and dividing by 20

Maths
looks like diff of two squares.. (x^3)^2-(y^3)^2 (x^3-y^3)(x^3+y^3) now go to Factoring a Sum of Cubes: a3 + b3 = (a + b)(a2 – ab + b2) Factoring a Difference of Cubes: a3 – b3 = (a – b)(a2 + ab + b2)

trigonometry(height and distance)
I agree.

trigonometry(height and distance)
sin45=h/(d) sin60=h/(d+5) h/d=.707 h/(d+5)=.866 d=h*1.414 so h=(h*1.414+5)*.866 solve for h

world history
More government. More food led to larger villages (away from farming), and larger villages cause a need for government (regulations, markets, police, etc).

Physics
Sum of heats gained is zero (some gains, some loses). Heat ice + heat water=0 150*Hfice+150*cw*(Tf-0)+300*cw*(Tf-50)=0 solve for Tfinal, Tf

ELA
all correct, go to the head of the class.

algebra-math
Yes, that is the start. Write all four equations in that matrix form. A + F + E + M = 184 A - F - E + 0M = 61 0A + 0F + E - M = 11 2A + 0F -E - M = 15 There are several methods, including row reduction.

Physics
force*distance=.05*9.8*3 solve for force

Physics
force*distance=1/2 massbullet*v^2 solve for force

Art
I agree. A bowl is a handy utensil, a pattern on it is pleasing.

Science I reallllllyyy need help!!!!
1. I dont like any of the answers, but facts, figures, and other evidence gathered through observation is in my opinion, the best. SCientific Inquiry is a PROCESS. Check your text on this... others ok.

physics
avgvelocity= total distance/total time total distance=60km total time=30/30 + 30/v =(v+30)/v 40=60/(v+30)/v = 60v/(v+30) 40v+1200=60v v=60km/hr

Science
time: force*time= mass*changeinvelocity change in velocity: 1/2 m vf^2=mgh vf=sqrt(2gh) time= mass*sqrt(2gh)/forceabove

Science
force*distance=energyfromfalling= mgh force=5*9.8*50/5 N

Chemistry stoichiometry
molality= molessolute/kgsolution .1m=mass/98)/(1kg) mass= 9.8 grams H2SO4

physics
with out a figure....

MATH
p is price of x burger, then divide by x to get price per burger Priceburger= 1/x * p = 120000/30000x -1/30000 dPriceburger/dx= -4x^2 put in x=45000, and you have the increase in revenue per burger. assuming costs are the same (which they never are).

Physics
here is a worked similar problem, use it as a guide https://www.jiskha.com/display.cgi?id=1360158331

Biology
all animals are not haploid.

Math-college
set this up with AS,AF,E,Am variables As+0Af-E-Am=69 0As+0Af+E-Am=7 0As+2Af-E-Am=23 As+Af+E+Am=178 1,0,-1,-1,69 0,0,1,-1,7 0,2,-1,-1,23 1,1,1,1,178 row1+4>4 1,0,-1,-1,69 0,0,1,-1,7 0,2,-1,-1,23 2,0,0,0,247 something is wrong, we have a non-integer for number of Africans. ...

Math
avg speed=totaldistance/total time total distance= 300 miles total time= 150/50 + 150/30=3+8=11hrs avg speed= 300/11= ...

chemistry
What is the temp, and presssure when it occupies 790cm^3?

chemistry
P1*V1/T1=P2*V2/T2 V2= P1*V1*T2/(T1*P2)

pre algebra 1
for each x, it decreases by 3 (-3x) for x=0, then, it must be -4 f(x)=-3x-4

chemistry
constant Temp? P1*V1=P2*V2 P2= P1*V1/V2

Physics
https://answers.yahoo.com/question/index?qid=20090812153140AAtLYQt

maths
opposite angles are equal, so two angles are 120 deg. the adjacent angles are "supplementary", so they are 60 degrees each.

Math
avg= total distance/total time= 300/(3hrs+5hrs)=300/8 miles/hr

science
https://www.merriam-webster.com/dictionary/volition the prefix in- means the negative, or not

math
Assuming one is only concerned with area, area is proportional to diameter^2. so if the diameter of the smaller pipes is 1/5, it must take 25 of them

science
https://www.jiskha.com/display.cgi?id=1502113619 I am not inclined to give you the final answer, you have to do something. Is there something you don't understand that I gave you previously?

Algebra
positive: two sign changes, max two real roots. negative: zero sign changes, zero real roots min number of non-real roots: 4-(2-0)=2

maths
https://www.youtube.com/watch?v=XXhbThOITLQ

math
25L=10(2L+2W) 25L=20L+20W 5L=20W L=4W but 25L=1000, or L=40m W=10m area= ????

Math
2.Which of the following assessment types has the least effect on your overall grade? portfolio item quiz sample work submission*** test <<<< " •quick checks – 5%" Quick check means pop tests, and going to do a sample problem, in a classroom, at...

Math
I agree with your responses, from the notes provided.

Math
blue=2/3(1-1/2)=1/3 yellow=1-1/3-1/2=1/6(6-2-3)=1/6

Algebra
see other post

Linear Algebra
constraint: S+T<=30 constraint: 8S+6T<=220 so, where do these lines intersect? 6S+6T=180 8S+6T=220 or 2S=40 ;S=20 and T=10 so the test points the boundary points (O,30)(220/8,0)(20,10) so figure profit for each point P=700S+600T P1=18,000 P2=19250 P3=20,000 check my work

Geography
The lifeguard represents the US (read the life preserver)

science
moment=q1*q2*distanceapart

Physics
Nuts to this problem. If one is moving across the river, the v=25m/s. If a current is at 90 degrees to the direction across the river, the time to get across is still 4 min. Now they may be moving downstream at some rate, but that does not affect how long it takes to get ...

Ela
correct

phaundi
Efficiency= MA/VA= 10/12 workinput*efficiencey=workout workinput*10/12=80*9.8*6 solve for work input.

physics
you will need the specific heat contents, ca, for ethyl alcohol. Heat= mass*ca*changeinTemp =.8kg*ca*(78.3-15)

pre-algebra 1
16/20=a/8 a= 16*8/20=.....128/20=6.4 about 6 I am wondering if the problem should have read 16 and 20 and the other triangle is 8 and a. That gives a=10

Physics
yes, in fact it will float higher. Think about Archimedes principle. Floating higher displaces less liquid

English
Q: why do you say poverty is anti women? A: Poverty is sexist, poverty affects women much more than men, and he gives examples. Childbirth, 1 in every 50 women die in childbirth due to weakness and lack of medical care; the number one cause of women's death in the world is...

Algebra
and another way to consider it. there are six folks for position A, and then 5 to consider for B. So 30 ways to get AB. But BA is the same group, so 30/2 is the number of different member groups.

Algebra
what is 6!/(2!4!)

math
what distance does it fall in 5 seconds? h=1/2 *9.8*25 how far horizontally did it go? tan 37=distanc/h distance= h*tan37 velocity= distance/5sec

Biology
enzyme helicase, what does it do? recosider d, and be a lawyer on how it is worded: Each double-stranded DNA helix is made of one new strand of DNA and one original strand of DNA.

algebra-math
14x-7y=21 x+7=19 ok, I will check your explanation of steps for solving.

physics
this makes no sense to me.

Physics
a) forcedownward= mg-200*.707 = 70*9.8-200*.707=545N b) force downward=mg+200*.707=827N

mechanics
I assume m1 is on the incline. summing forces on the rope then toward m2 m2*g-m1*sinTheta*g=(m1+m2)a if no friction m2*g-m1*sinTheta-m1*mu*cosTheta= (m1+m2)a with friction.

mechanics
dthanks

logic
https://curiosity.com/topics/can-you-solve-the-matches-grid-puzzle-curiosity/ there are a number of solutions. Do it.

Algebra
what is 7*6?

Physics College
sum moments about the pivot W*3.76/2-345(3.76/2-.25)=0 solve for Weight W

Algebra
if a is the favorite, there are five choices for b. Yet instead of a, there are six choices for first, and five for second. number votes: 6*5=30

Physics
sum moments about the boy, located at x from the end where he is going. 250*x=(650-250)*(5-x) solve for x

math
what does this mean? 4 squared -2(3x5+1) what does 3x5 mean?

math
again, what you have written makes zero sense.

Physics
momentum is conserved. so initial momentum is zero. So 2*V1+2*V2+2*V3=0 you are given v1, v2. so add them. Then if their sum is L i+Mj, then v3 must be -Li-Mj m/s and magnitude is sqrt(L^2+M^2)

math
a. find the slope of the line x+9y=-37, you should get -1/9 as above. b. now write the standard equation with that slope y=-x/9 + b put the point in, and solve for b.

math
parallel to x+9y=-37 or y=-1/9 x + ... so the slope is -1/9 to be parallel. y= -x/9 + b put in (-5,-7) and you have b, and the line equation is solved.

math
what is arctan(7/24) W of N?

chemistry
http://dev.physicslab.org/Document.aspx?doctype=3&filename=AtomicNuclear_ChadwickNeutron.xml

Albert Academy
It demonstrated the central small nucleus, rather than a large distributed area of positive charges.

Maths
words= rate*time words= 3200/60min * 15 min

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