02/10/21

If you roll a fair 6 sided die 5 times, rolling a 4 is considered to be a success, what are the chances of rolling exactly 3 successes?
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02/10/21

Find cosθ, secθ, and cotθ, where θ is the angle shown in the figure.
cosθ =secθ =cotθ =the hypotenuse side is 9the other side is 4the base is emptythe θ is at the bottom between the hypotenuse and baseGive exact values, not decimal approximations. 
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02/09/21

Please Help!!! A spring force is given by the formula F=2x-15x^2, where F is in N and x is in m. What is the change in potential energy wen the spring is stretched 1m from it's equilibrium position.
A spring force is given by the formula F=2x-15x2, where F is in N and x is in m. What is the change in potential energy wen the spring is stretched 1m from it's equilibrium position.
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02/06/21

Evaluate lim x→0 √(x+ 2) − √(2) / x. Do not draw a graph or make a table of values.
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02/06/21

A solution is made using 103.9 g of phenol (MM = 94.11 g/mol) and 70.0 g of acetone (MM = 58.08 g/mol). What is the mole fraction of the phenol in the solution?
A solution is made using 103.9 g of phenol (MM = 94.11 g/mol) and 70.0 g of acetone (MM = 58.08 g/mol). What is the mole fraction of the phenol in the solution?
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02/06/21

CHEMISTRY HELP Consider the reaction. A(aq)↽−−⇀2B(aq) KC=7.81×10^−6 at 500 K
Consider the reaction.A(aq)↽−−⇀2B(aq)𝐾c=7.81×10−6 at 500 KIf a 5.40 M sample of A is heated to 500 K, what is the concentration of B at equilibrium?
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02/06/21

How many terms of the series 25+19+13 +… are required to make the sum −20?
How many terms of the series 25+19+13 +… are required to make the sum −20?
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02/06/21

Electric Potential Energy
Charges A, B, and C each with charge +q are arranged in an equilateral triangle with length d. If all the charges are let go and they fly off to infinity, what is the speed that each of the charges... more
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02/05/21

Average rate of change

Find the average rate of change of g(x)=6x4+9/x3 on the interval [-3, 1].
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02/03/21

A bacterium culture initially contains 2000 bacteria and doubles in size every half hour. Find the size of the population after: a) 3 hours b) 80 minutes
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02/02/21

What are the IMFs?
What are the intermolecular forces between H2O and NH3?
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02/02/21

Given f(x) = { x^3 - 1, x ≤ -1....(Please help)
Given f(x) = { x^3 - 1 x ≤ -12mx^2 - 5kx + 1, -1 < x < 2,(1 - 4x)/x + 5 x≥ 2 }Find the values of m and k such that f is continuous.
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02/02/21

A bag contains 5 green marbles, 3 blue marbles, 2 red marbles, 4 purple marbles, and 1 black marble. What is the probability that you draw a black OR purple marble?

represent your answer as a percent rounded to the nearest tenth if necessary. 
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01/26/21

chemistry homework question
Using the standard enthalpies of formation, what is the standard enthalpy of reaction? CO(g) + H2O(g) ⟶ CO2(g) + H2(g)
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01/26/21

You roll a fair six sided die twice.

Find the probability of rolling a 3 the first time and a number greater than 1 the second time
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01/26/21

Calculus Question
Show that the dot product in Rn distributes over vector addition. For vectors v, w, and z one has v*(w+z)= v*w+v*z
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01/16/21

need help please
how many grams are present in 7.62 x 10^21 molecules of sulfur hexafouriode gas at STP?
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01/15/21

A non-conducting disc of radius R carries a surface charge density σ = 0.5 r μC/m2 on one face. Calculate the total charge on the disc in terms of R?
A non-conducting disc of radius R carries a surface charge densityσ = 0.5 r μC/m2 on one face.Calculate the total charge on the disc in terms of R?
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01/14/21

Chemistry Equilibrium (Can Someone Answer This)
Consider the reaction 2NOCl(g) —> 2NO(g) + Cl2(g). At 25oC, a particular experiment showed the equilibrium pressures to be PCl2 = 3.00 E-3 atm PNO(g) = 1.25 E-3 atm PNOCl(g) = 1.20... more
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01/14/21

Read the Description
Be sure to indicate all non-zero formal charges in the structure. Draw the Lewis Structure of NO43-, including lone pair electrons, with the formal charges minimized. Please help me. I have... more
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01/13/21

If F′(x)=x3−9 and F(1)=1, what is F(x)?
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01/13/21

need help with this
A blue ball is thrown upward with a velocity of 9 m/s upward from the top of a high cliff. At the same time, a red ball is dropped from the same spot. The red ball is observed to hit the ground... more
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01/13/21

Find the angle between the two vectors: u = cos 5π/6 i + sin 5π/6 j and v=cos π/4 i + sin π/4 j
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01/13/21

Need help on this problem

The first word spoken on the surface of the Moon after Apollo 15 landed on July 30, 1971, was “Bam!” this was James Irwin’s involuntary reaction to their rather bone-jarring touchdown. “We hit... more
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01/13/21

Molecular Formula Notes Check

Consider:Acetylene, a gas used in welding torches, has the empirical formula of CH and a molar mass of 26.04 g/mol. The ratio for this problem is (two decimal places):   g/mol  g/mol The... more
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