Questions and answers by

Jin

Questions (91)

A state used to have a flat tax rate on individual income taxes. Recently the state implemented a progressive tax structured on
1. 0 answers
2. 507 views
Hey i was wondering if you guys can help me with a question.Which of the following choices is true about models used in science?
1. 1 answer
2. 427 views
Evaluate the expression (3²)²+ 1
1. 1 answer
2. 442 views
I need to write a real life word problem for X + 13 = -34
1. 3 answers
2. 408 views
Is "words are eaten" personification?
1. 3 answers
2. 404 views
Two tourists went on a hike at dawn. One went from a to b and another one went from b to a. They met at noon but did not stop
1. 0 answers
2. 503 views
According to the CDC, 25 % of college students get the flu every year.(a) If 7 college students are selected at random? What is
1. 2 answers
2. 588 views
Suppose that 20 workers were required in 2010 to produce 120,000 bushels of wheat on a 1,000-acre farm.a. What is the average
1. 0 answers
2. 794 views
Draw a picture that represents 3x50=150?
1. 6 answers
2. 1,526 views
An orange rolls across a table with a speed of 0.5 m/s and falls off the edge. If it lands 3 m from the edge of the table, from
1. 4 answers
2. 8,504 views
I'm working on substitution organic chemistry problems and I just had a question.There's an equation in which a molecule is
1. 0 answers
2. 540 views
The activation energy, Ea, for a zeroth-order reaction, X-->products, is most readily obtained from the slope of a plot of:
1. 1 answer
2. 685 views
A reaction has a first order rate constant of (6.25x10^-5 1/s) at T=298.15K and (0.0000538 1/s) at T=338.15K.What is the value
1. 1 answer
2. 423 views
According to the mechanism below, what is the correct expression for the rate consumption of A?In the mechanism, M is a molecule
1. 0 answers
2. 428 views
The decomposition reaction, x-->products, is second-order with rate constant k=0.0183 L/(s)(mol).How long will it take for the
1. 1 answer
2. 880 views
A ball is thrown into the air with an upward velocity of 28 ft/s. Its height (h) in feet after t seconds is given by the
1. 2 answers
2. 5,153 views
find all values of x for which function is differentiable.y=lnx^2 why is the answer= for all x doesn't equal 0?
1. 1 answer
2. 960 views
find the derivative y= csc^-1 (secx)0 less than or equal to x less than or equal to 2¤Ð what did i do wrong? - 1/ secx
1. 0 answers
2. 903 views
f(x)=8x^3+1x^2–8x+2/–7x^2–4x+9Find the equation of the non-vertical asymptote. y = Does f(x) intersect its non-vertical
1. 1 answer
2. 540 views
Consider the functionf(x)=–3x3–1x2+1x+1Find the average slope of this function on the interval (–2–1). By the Mean Value
1. 1 answer
2. 688 views
what is the derivative off(x)=6sin2x I put 12cosx...
1. 1 answer
2. 367 views
How do you find the derivative of square root of five /t^5?how do you find the derivative of square root of five /t^5 I know
1. 1 answer
2. 532 views
If a ball is thrown vertically upward from the roof of 32 foot building with a velocity of 80 ft/sec, its height after t seconds
1. 1 answer
2. 762 views
If f(x)=(x^2+3x+4)^2how do you find the derivative I tried doing 2 (2x+3)..
1. 1 answer
2. 375 views
how do you find the derivative ofsquare root of 5 /t^5
1. 3 answers
2. 420 views
how do you find sin7x/4x when lim x goes to 0the answer is 7/4
1. 2 answers
2. 823 views
how doessecx(tanx + tan^2x- sec^2x) simplified to sec x (tanx -1)?
1. 1 answer
2. 1,009 views
how do you find the derivative of square root of x
1. 1 answer
2. 338 views
I don't know howy-1=-1/3(x-3) is simplifes to x+3y-6=0
1. 1 answer
2. 345 views
In the theory of relativity, the mass of a particle with velocity v ism=mo/(square root ((1- v^ 2)/ c^2)) where mo is the mass
1. 2 answers
2. 1,254 views
how do you factor our a cube?x^3 +8
1. 2 answers
2. 334 views
evaluate the limitas lim h goes to 0 ((2+h)^3 - 8)/h the answer is twelve but I don't know how to factor out the cube
1. 1 answer
2. 402 views
evaluate the limitas lim goes to -1 (x^2 +2x +1)/ (x^4 -1) the answer is zero but i don't know how to get it
1. 1 answer
2. 508 views
if f(x)isgreater or equal to 10x–42 but less than or equal to x2+2x–26 determine limx4f(x) = What theorem did you use to
1. 4 answers
2. 510 views
If a ball is thrown straight up into the air with an initial velocity of 95 ft/s, it height in feet after t second is given by
1. 2 answers
2. 6,412 views
if f(x)isgreater or equal to 10x–42 but less than or equal to x2+2x–26 determine limx4f(x) = What theorem did you use to
1. 0 answers
2. 463 views
An open box is to be made from a flat piece of material 18 inches long and 2 inches wide by cutting equal squares of length
1. 2 answers
2. 2,690 views
find the domain of functionf(x)= (5x + 4)/(x^2 + 3x + 2) is the answer.. x can't be -2 or -1?
1. 2 answers
2. 577 views
Rates of chemical reactions usually depend on temperature and pressure. However, half-life of all radioactive elements is
1. 1 answer
2. 538 views
how do you solve this?The candy indistry converts sucrose (C11H22O11,table sugar),a crystalline material, to invert sugar, a
1. 0 answers
2. 469 views
Which of the following salts would show an appreciable pH-dependent solubility?a. AgCl b. Mg(OH)2 c. BaF d. both b and c e. all
1. 1 answer
2. 683 views
A salt that could decrease the ionization of HCOl in soln is probablya. NaOH b. NaCl c. NaOCl d. NaH e. none of these how would
1. 1 answer
2. 1,192 views
In titration of a 0.10M soln of Na2Co3 with HCL which of the following will be present in the largest concentration at the first
1. 1 answer
2. 606 views
Which of the following when added to 100.0mL of a 0.100M soln of NH4Cl would produce a buffer soln?a.100.0mL of 0.100 M HCl soln
1. 1 answer
2. 790 views
why is it that [H2O] is NOT included in the rate law, even though it is a reactant?
1. 1 answer
2. 480 views
why is it that [H2O] is NOT included in the rate law, even though it is a reactant?
1. 0 answers
2. 365 views
Faraday¡¯s Law of Electrolysis• Practice Problem. • What is the oxidation state of the osmium atom in an unknown salt if
1. 1 answer
2. 927 views
To have a color, the transition metal complexshould have an electron in a d-orbital, and an unoccupied spot in a higher energy
1. 1 answer
2. 503 views
Determine the oxidation state of each transition metal in the following cmpds. (a) Na2MoO4 (b) KAuCl4 (c) MgWO4 and (d) Ni(CO)4
1. 2 answers
2. 1,648 views
How do you know if these solutions are acidic, basic, or nearly neutral?a. NH4NO2 b. Cr(NO3)3
1. 2 answers
2. 6,534 views
The values of Ksp for AgBr and AgCl, are 7.7x10^-13 and 1.6 x 10^-10. A solution containing a mixture of 2.0x10^-2 M Br and 2.0
1. 1 answer
2. 1,057 views
7.50gram quantity of a diprotic acid was dissolved in water and made up to exactly 250ml. If 25ml of this solution were
1. 3 answers
2. 561 views
I had this on a test, not sure how to do itExplain, using balanced chemical reactions with the smallest integer coefficients,
1. 1 answer
2. 940 views
Discuss the spontaneity of an electrochemical reaction in terms of its standard emf (E¨¬cell)
1. 3 answers
2. 2,379 views
Explain, with balanced ionic equations, whya. CuI2 dissolves in ammonia solution b. AgBr dissolves in NaCN solution, c. HgCl2
1. 1 answer
2. 1,511 views
Solid NaI is slowly added to a soln that is 0.010M in Cu+ and 0.010M in Ag+.a. Which compound will begin to precipitate first?
1. 2 answers
2. 1,106 views
Write balanced equations and solubility product expressions for the solubility equlibria of the following compounds:a. CuBr b.
1. 2 answers
2. 3,814 views
The amount of indicator used in an acid-base titration must be small. why??
1. 1 answer
2. 827 views
How do you solve this problem?In a certain industrial process involving a heterogeneous catalyst, the volume of the catalyst (in
1. 1 answer
2. 1,981 views
the chapter is about chemical kineticsReaction mechanisms: What does it mean by mechanism of a reaction? What is an elementary
1. 1 answer
2. 516 views
how do you solve this problem?consider the reaction A->B the rate of the reaction is 1.6 x 10^-2 M/s when the concentration of A
1. 1 answer
2. 1,295 views
Determine the overall orders of the reactions to which the following rate laws apply:a) rate= k[NO2]^2 b) rate = k c) k
1. 1 answer
2. 792 views
how do you solve thisWhat is the pH of the solution created by combining 2.60 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10
1. 1 answer
2. 467 views
how do you solve this?What is the pH of the solution created by combining 12.30 mL of the 0.10 M NaOH(aq) with 8.00 mL of the
1. 0 answers
2. 449 views
Which reactants in the reactions beloware acting as Br©ªnsted-Lowry bases? NH4 +(aq) + OH−(aq) <-> NH3(aq) + H2O(l) H2PO4
1. 1 answer
2. 773 views
The pKa for hydrochloric acid is −6.0.What is the concentration of HCl(aq) we would expect to find in a 1 M solution of
1. 0 answers
2. 504 views
for SCN-if S-C has a bond order of 1, S=C and C=N have bond orders of 2, and C triple bond N hasa bond order of 3, ... Do the
1. 1 answer
2. 3,002 views
how do you know which bonds have a more pie bonding character than the other bond?and how do you know if it point to one
1. 1 answer
2. 480 views
how do you know which resonance structure is more stable according to the energy?does higher energy mean more stable?
1. 1 answer
2. 442 views
The Fe(ox)33– complex ion creates an emerald green solution when dissolved.The observed solution color of the complex
1. 4 answers
2. 687 views
Wile E. Coyote is holding a “HEAVY DUTY ACME ANVIL” on a cliff that is 40.0 meters high. The Roadrunner (beep-beep), who is
1. 4 answers
2. 4,970 views
A skier leaves the end of a ramp with a velocity of 25.3 m/s and lands 50.3 m from the base of the ramp. How high is the end of
1. 1 answer
2. 599 views
In Figure (a), a block of mass m lies on a horizontal frictionless surface and is attached to one end of a horizontal spring
1. 3 answers
2. 4,848 views
How does discounted cash flow differ from the other valuation methods?
1. 0 answers
2. 439 views
How does the frequency of interest compounding, regardless of the rate of interest or period of accumulation, affect the future
1. 0 answers
2. 469 views
Would you expect the dissolved oxygen concentration of water samples taken from a lake at 7 am to be higher or lower than
1. 4 answers
2. 1,235 views
What effect does water loss (through heavy perpiration) have on a person's endocrine system?
1. 1 answer
2. 555 views
I had to observe slides of onion root tip to study plant mitosis. And the question I have to answer asks,if your observations
1. 2 answers
2. 992 views
why does pH of the matrix increase when electrons flow along the electron transport chains of mitochondria?
1. 1 answer
2. 683 views
Topic being the linearization (finding the equation of the tangent lines), how do you determine if it's overestimate or
1. 0 answers
2. 419 views
I know how to find the interval of convergence, but I don't understand when to check for convergence at the endpoints (to see if
1. 0 answers
2. 504 views
If you have a geometric alternating series, and you prove that the series is converging by doing geometric series test, and NOT
1. 0 answers
2. 657 views
Find the volume of the solid whose base is the region bounded by the graphs of y=x^3,x=1, and the x-axis, and whose cross
1. 0 answers
2. 490 views
Need help in unscrambling this phrase:MTLEFKOTRYETEEMCISRTRAE for what subject?Is this for What subject is this for? capilpsean
1. 5 answers
2. 1,276 views
I am finding the second derivative of (x^2)(y^3) = 12x(y^3) + (x^2)(y')(3y^2) = 0 And I simplified the answer to y'= (-2y)/(3x)
1. 0 answers
2. 704 views
How would you define balanced sentences?Could you give me some examples? Thanks! Balance in writing sentences is generally
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2. 631 views
what is the derivative of sin(x^(1/2)) and (sin(x))^(1/2)?Is there a difference? Thanks! Yes, there is a difference. Use the
1. 0 answers
2. 383 views
I'm having trouble understanding what kind of sentences these are:Compound? Compound-complex? Declarative? Interrogative?
1. 0 answers
2. 514 views
Are there any connections between evolution and environmental science-- if there is, what is it?Thanks! Weren't many lakes back
1. 0 answers
2. 447 views
I know how environmental science branches off to various sciences-how does astronomy (to be specific, the discovery that Pluto's
1. 1 answer
2. 671 views
For 1980 through 1990, the average weekly earnings (in dollars)for workers in the United States can be modeled by E= 14.5t +
1. 1 answer
2. 2,003 views