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Posts by UN

Total # Posts: 47

Math
[x-48]/x<-8 x-48<-8x 9x<48 x<48/9

Math
f(4)=(5(4))+2)-1=21 g(2)=((5*2))+2)=12 f(4)-g(2)=21-12=9 ????

Physics
1.41 x 10^-9 cm (0.0141 nm) belongs on the border of the x-ray section of the electromagnetic spectrum. ????

Algebra
If the two equations are equal, then there are infinitely many solutions to the system of equations, since one of the equations is just another way of saying the first equation. ????

algebra
The formula for this would be: A=P x [(1+APR)^y-1]/APR where A is the final amount in the account, P is the annual contribution,APR is annual percentage rate, and y is the number of years. So, we have: A=15x[(1+.07)^7-1]/.07=$129.81 To this, we add the amount of $60, the ...

Math
1030000/95*4=2710 plants with 200mg left over. ????

Math
Let n be the number of checks written. Then, in order to be equal: 4.5+0.15n=9 will tell you the number of checks before costs are equal.

Math
11:30 a.m. + 2 hours=13:30 hours, or 1:30 p.m.

Math
Bal=P(1+r)^y where Bal is your balance, P is your principal, r is the interest rate per year, and y is the number of years. So: Bal=2550(1.03)^1.5 Bal=$2665.61 ????

finance
Find the final amount in the following retirement account, in which the rate of return on the account and the regular contribution change over time. $470 per month invested at 5%, compounded monthly, for 7 years; then $709 per month invested at 7%, compounded monthly, for 7 ...

Algebra
Let n and 16000-n be the amounts invested at 5% and 3%, respectively. Then: .05(n)=.03(16000-n) .08n=480 n=6000 .05n=300 .03(16000-n)=300 Both investments earn $300 apiece, making a grand total of $600 for the year. ????

Statistics
If the odds are 3 to 5 in favor, this means that the man will get the $200 3 times out of 3+5 times, or 3 out of 8, which is .375, or 37.5% of the time. ????

math
A certain disease has an incidence rate of 0.8%. If the false negative rate is 7% and the false positive rate is 3%, compute the probability that a person who tests positive actually has the disease. Show all work.

math
Excited about the success of celebrity stamps, post office officials were rumored to have put forth a plan to institute two new types of thermometers. On these new scales, E° represents degrees Elvis and M° represents degrees Madonna. If it is known that 40°E = 25&...

math
Account A and B each start out with $500. If Account A earns $50 each year and Account B earns 5% of its value each year, after how many years will Account B have more money than Account A? If necessary, round your answer to the nearest year.

Rate and Sped Algebra
1/2 + 1/x=1/1.2 1.2x+2.4=2x .8x=2.4 x=3 days working by yourself. ????

math
the biggest of 3 consecutive integers is half of the smaller number increased bey two find the numbers

math
yes the answer is 20

Maths calculus
2/27m^3 x=2/3

math math :(
Sorry about that. I miscalculated. For your question: x=[105000(.005666667)(1.00566666667)^360]/[(1.00566666667)^360 -1] x=684.521 as the mortgage payment. Then add 1/12(621+685)=108.83333, and you have $793.35 as the total monthly payment.

math math :(
For your question: x=[150000(.005666667)(1.00566666667)^360]/[(1.00566666667)^360 -1] x=977.88778 as the mortgage payment. Then add 1/12(621+685)=108.83333, and you have $1086.72 as the total monthly payment.

Geometry
the answer is 18/5=4/T 18T=20 T=10/9

chemistry
Rank from decreasing to increasing the effect the functional groups have on the melting point of compound x: -OH or -COOH i think its COOH<OH because OH is easier to hydrogen bond?

chem
A solution consisting of isobutyl bromide and isobutyl chloride is found to have a refractive index of 1.3931 at 20oC. The refractive indices at 20oC of isobutyl bromide and isobutyl chloride are 1.4368 and 1.3785, respectively. Determine the molar composition (in percent) of ...

chemistry
i inputed: -Log(5.20 x 10-4) ph=3.28 but its incorrect?

chemistry
okay, i got 2.8E-4 mols of NaOH and 8e-4 MOLS of acetic acid, so do i just plug in mols of hcl into -log(hcl)?

chemistry
What is the pH of the solution created by combining 2.80 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)? with 8.00 mL of the 0.10 M HC2H3O2(aq)? mL of NaOH pH w/HCl pH w/HC2H3O2 2.80 ? ? okay, so i tried m1v1=m2v2 and when i got m2 i would input it in -log(H+) to...

chem
thats not the ansr, need a check

chem
i got 1,8,1,1,4,1 but the second coeffient(one) and the last coeffient(one) are incorrect. im not sure what goes for ____Fe(2+) and ___Fe(3+)

chem
Balance the equation: Note: If a chemical species coefficient is "1" then "1" needs to be entered in the field before that species. ___MnO4(–) + __H(+) + ___Fe2 + __Mn(2+) + ___H2O + ____Fe(3+)

chem
need the check pls

chem
on this one i got:2,16,2,2,8,4 but it say that the second(2)which is the coefficent for C204(2-) and the 4 on the co2 is wrong ? what might be the problem?

chem
Balance the equation: Note: If a chemical species coefficient is "1" then "1" needs to be entered in the field before that species. __MnO4(–) + __H(+) + __C2O4(2–) __Mn(2+) + __H2O + __CO2 i need a check pls

Chemistry
i see what my problem is, thanks i got it.

Chemistry
iam confused with the ice table could you show me because my answer .0002 is incorrect thanks.

Chemistry
The standard solution of FeSCN2+ (prepared by combining 9.00 mL of 0.200 M Fe(NO3)3 w/1.00 mL of 0.0020 M KSCN) has an absorbance of 0.510. If a trial's absorbance is measured to be 0.250 and its initial concentration of SCN– was 0.00050 M, the equilibrium ...

Chemistry
A standard solution of FeSCN2+ is prepared by combining 9.00 mL of 0.200 M Fe(NO3)3 w/1.00 mL of 0.0020 M KSCN. The equilibrium concentration of FeSCN2+ ([FeSCN2+]std) for this standard solution is assumed to be__?__M

Chemistry
thanks but i figured how to do this

Chemistry
The concentration and volume of reagents combined in each trial are listed in the table below: Trial 00020 M 00020 M H2O(mL) Fe(NO3)3mL) KSCN (mL) 1 5 2 3 2 5 3 2 3 5 4 1 4 5 5 0 Initially (right after combining and before any reaction occurs) the concentration of SCN– in...

chemistry
____?____g of glucose C6H12O6 must be dissolved in 400 g of water to give a solution that is 0.258 m(molality).

Chemistry
A solution is made by mixing 35.0 mL of toluene C6H5CH3 d=0867gmL with 125.0 mL of benzene C6H6 D=0874gmL. Assuming that the volumes add upon mixing, the molarity (M) and molality (m) of the toluene are? Find M and m

chem
thanks i got

chem
An aspirin tablet weighing 0.650 g has been analyzed and contains 68.2 % ASA (180.16 g/mol) by mass. A student dissolved the tablet in hot NaOH and the cooled solution was diluted with DI water to the mark in a 250 mL volumetric flask. Exactly 3.00 mL of the solution was ...

chem
An aspirin tablet weighing 0.650 g has been analyzed and contains 68.2 % ASA (180.16 g/mol) by mass. A student dissolved the tablet in hot NaOH and the cooled solution was diluted with DI water to the mark in a 250 mL volumetric flask. Exactly 3.00 mL of the solution was ...

chemistry
Determine the ionization energy of a hydrogen atom (in kJ/mol) if the electron is in its ground state. (Hints: Use the Rydberg equation, remember E=hc for a single H atom, and R=109678x10–2nm )

chemistry
You transfer a 2M stock solution of Y into a container using a slightly wet pipet containing water drops. The concentration of the transferred solution Y has a ? (lower, higher, or same) concentration than(as) 2M.

chemistry
o prepare a 200 mL of aqueous stock solution X, you transferred 50 mL of a known concentration solution into a 200 mL volumetric flask. If you realize that the volumetric flask was contaminated with water droplets after you cleanly transferred the known concentration solution...

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