# Posts by han

Total # Posts: 123

math
I buy 6 CDs for \$6.99. How much change do I get from \$50? Please does it mean one CD \$6.99 or 6 CDs total \$6.99? Cheers!

math
I bought 3 oranges for 29p and 2 drinks for 90p. How much did I spend altogether? Does it mean 29p for each organes or for all 3 oranges? cheers!

Math
suppose the distance(in feet) that an object travels in t seconds is given by the formula s(t)= 2t^3 + 45 - 5. find s(2), v(2) and a(2)

statistics
13/11

Geometry
The median of a trapezoid measures 18 centimeters the length of the bases could be?

Math
thank you

Math
What is the equation x = y + z solved for z?

chem
At 668K 1 mol each of CO and Cl2 are introduced into an evacuated 1.75 L flask. At equilibrium, the total pressure of the gaseous mixture is 32.4 atm. Calculate Kp. How to solve this ? Co+Cl2<>CoCl2

chemistry
Bromine gas is allowed to reach equilibrium according to the equation. Br2=2Br Kc=0.0011 at 1280°C Initial concentration of br2 is 0.063M and Br is 0.012M. How to calculate the concentration of these species at equilibrium. Please help me .

physics
A baseball has a mass of about 0.15 kg, and it is pitched towards home plate at a speed of about 60 m/s. If the bat exerts an average force of 8600 N for 2.4 ms, what is the final speed of the ball in m/s?

Math
Solve algebraically, 1/x=(x-34)/(2x^2).

Physics
because when I do that I get a different answer than there is

Physics
So you want me to split the two forces into North and East then add it

Physics
I don't completely understand

Physics
In a football game, a quarterback (G), hit simultaneously by two linebackers, experiences horizontal forces of 412 N [27.0° W of N] and 478 N [36.0° N of E]. Determine the net force of the quarterback.

Math
The answer says the ROC is -2737.8

Math
Determine the intensity of radiation andits rate of change on Earth, which is 1 AUfrom the Sun.

Math
Radiation from the Sunkeeps us all alive, but with the thinning of the ozone layer, it is important to limitexposure. The intensity of radiation is inverselyproportional to the square of the distance thatthe Sun’s rays travel.The formula I=k/d^2 models the ...

Math
without solving, describe two ways to show that 2, -1, 3, and -2 are the roots of the polynomial equation x^2-2x^3-7x^2+8x+12=0.

Math

Math
I tried it didn't work

Math
Solve by factoring x^3-4x^2-3x+18=0

Math
ok thanks :D

Math
ok thanks but how do you know if the roots are imaginary or not?

Math
Determine the real roots of the polynomial equation: (x^2+1)(x-4)=0

Physics
During baseball practice, you go up into the bleachers to retrieve a ball. You throw the ball back into the playing field at an angle of 42° above the horizontal, giving it an initial velocity of 15 m/s. If the ball is 5.3 m above the level of the playing field when you ...

Physics
An airplane dropping supplies to northern villages that are isolated by severe blizzards and cannot be reached by land vehicles. The airplane is flying at an altitude of 785m and at a constant horizontal velocity of 53.5 m/s. At what horizontal distance before the drop point ...

Physics
A city bus leaves the terminal and travels, with a few stops, along a straight route that takes it 12 km [E] ofits starting position in 24 min. In another 24 min, the bus turns around and retraces its path to the terminal. What is the average speed of the bus for the entire ...

Physics
route that takes it 12 km [E] of its starting position in 24 min. In another 24 min, the bus turns around and retraces its path to the terminal.

Chemical
Ok thanks a lot for your help I understand it now :D

Chemical
The molar enthalpy of solution for ammonium chloride is 14.8kJ/mol. What is the final temperature observed when 20.0g of ammonium chloride is added to 125mL water at 20.0'C?

Chemistry
ok thanks

Chemistry
For the following equation, write a thermochemical equation that includes an energy term within the equation: The formation of 1 mol of copper(II)chloride from its elements releases 220.1kJ of energy.

Chemistry
Ok thanks again for all your help :D

Chemistry
ok thanks a lot for your help but why did you put a question mark after the > in the equation you gave?

Chemistry
What do you mean?

Chemistry
Rewrite the following using a thermochemical equation with a deltaH value: a) The standard molar enthalpy of combustion for propane is -2220kJ/ mol.

Physics
Assuming the best high jump record from a standingposition in a school was 1.52 m, what initial velocity was needed for this jump? Neglect any sideways motion.

Physics
wait nvm

Physics
If I send you a link could you take a look at it?

Physics
A 45-t electric train accelerates uniformly from a station with the train’s motion depicted in the graph in Figure 2.(Recall that 1 t = 1.0 × 103 kg.)Determine the net force acting on the train during the uniform acceleration portion of the motion.

Physics
Alright thanks a lot mate :D

Physics
The Yukon Quest, an annual dog-sled race between Whitehorse in the Yukon and Fairbanks in Alaska, covers a gruelling distance of 1.61 × 103 km. Assuming that the average speed of the dog team that set a course record is 6.28 km/h, determine the best time for this race. ...

Math
I know

Math
Use partial factoring to determine the vertex of y=3x^2+5x-1.

Math
oh ok thanks a lot for your help :D

Math
angle theta is in the standard position and 0'=<theta=<180'. If cos theta = -2/3, find the exact value of sin theta* tan theta.

Math
thanks for you help :D

Math
The doubling period of a bacteria culture is 35 minutes and it starts with 1400 bacteria. How many bacteria will there be after 3 hours? Round your answer to the nearest tenth.

Maths
ok thanks a lot for your help :D

Maths
The average depth of the water in a port on a tidal river is 4 m. At low tide, the depth of the water is 2 m. One cycle is completed approx every 12 h. a) find an equation of the depth d(t) metres, with respect to the average depth, as a function of the time, t hours, after ...

Math
sorry it should be corrected to t

Math
Determine the number of triangles that could be drawn with the given measure. Then, find the measures of the other angles and the other side in each possible triangle. Round side lengths to the nearest tenth of a unit and angle measure to the nearest tenth of a degree, where ...

Math
Ok thanks a lot for your help steve :D

Math
How do you know what the period of this function is: y=2cos3(x+45')? Explain.

Math
ok thanks a lot for your help :D

Math
Determine the number of triangles that could be drawn with the given measure. Then, find the measures of the other angles and the other side in each possible triangle. Round side lengths to the nearest tenth of a unit and angle measure to the nearest tenth of a degree, where ...

Maths
but that wasn't the correct answer

Maths
Find the maximum or minimum value of function and the value of x when it occurs: -2x^2+5x+5.

Math
wait nvm thanks for your help :D

Math
so can you show me the correct way to do it?

Math
but the answer says that it's a max of 65/8 at x=5/4

Math
Find the maximum or minimum value of function and the value of x when it occurs: -2x^2+5x+5.

Chemistry
ok thanks :D

Chemistry
A sample of hydrogen gas is collected by water displacement at 20.0'C when the atmospheric pressure is 99.8kPa. What is the pressure of the dry hydrogen, if the partial pressure of water vapour is 2.33kPa at that temperature?

Chemistry
I figured it out thanks for your help :D

Chemistry
I got 1.7*10^4L but not sure if I was correct or not

Chemistry
A tank of chlorine gas contains 25.00 kg of pressurized liquid chlorine. If all the chlorine is released in its gaseous for at 17'C and 0.98atm, what volume does it occupy?

Math
If 5+x, 8, and 1+2x are consecutive terms in an arithmetic sequence, find x.

Math
A doctor prescribes 200 mg of medication on the first day of treatment. The dosages is halved on each successive day for one week. To the nearest milligram, what is the total amount of medication administered?

Math
Find the sum of the arithmetic series -12-9-6-...39.

Math
How do you get the values?

Math
A tractor-trailer worth \$84 000 depreciates 20% the first year and 10% each year thereafter. How much is it worth after 5 years?

Math
wait I understand thanks for your help :D

Math
why didn't you use this equation: 765=3(2)^n-1

Math
How many terms of the series 3+6+12+24+...add to 765?

Maths
like sorry for the sequence 1, 4, 16 how did you get 1?

Maths
I have one last question. How did you know a=1?

Maths
alright thanks :D

Maths
by the way did you multiply the equation by 10 to get rid of the decimal to get a whole number?

Maths

Maths
A geometric series has three terms. The sum of the three terms is 42. The third term is 3.2 times the sum of the other two. What are the terms?

Math
ok thanks

Math
A ball is thrown 16 m into the air. The ball falls, rebounds to half its previous height, and falls again. If the ball continues to rebound and fall in this manner, find the total distance the ball travels until it hits the ground for the sixth time.

Chemistry
ok thanks a lot for your help :D

Chemistry
so then would the answer be 2.07?

Chemistry
The temperature of a 2.25L sample of gas decreases from 45.0'C to 20.0'C. What is the new volume?

Math
thanks a lot for your help!

Math
Canada ranks fifth in the world in the production of gold. By the end of one year, one of Canada's mines had produced about 198 t of gold since it opened. if the annual production averaged 4.5 t, predict the total production by the end of next year and the year after that

Math
A Canadian zoo started with 16 whooping cranes and planned to hatch 20 chicks a year. A few birds were kept for breeding and the rest released into the wild. At the end of last year, a total of 136 cranes had spent some time in the zoo. If the pattern continues, how many ...

Physics
Hey thanks a lot but how did you know to put 8/(24)?

Physics
Find the equivalent resistance in 16 ohm and 8.0 ohm connected in parallel.

Physics
Find the equivalent resistance in 16 ohms and 8.0 ohms connected in parallel.

Math
Alright thanks a lot :D

Math
An exponential function with a base of 3 has been vertically stretched by a factor of 1.5 and reflected in the y-axis. Its asymptote is the line y=2. Its y-intercept is (0,3.5). Write an equation of the function and state its domain and range.

chemistry
Thanks :D

chemistry
can you please show me the proper way to do it?

chemistry
Yes but the answer was incorrect

chemistry
HCL acid is available as a stock solution with a concentration of 10 mol/L. If you need (9.0*10^-1) L of (2.50*10^0) mol/L hydrochloric acid, approximately how much distilled water will you need to make the dilution?

chemistry
Thank you for all your help it was much appreciated :D

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