# 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**

ok thanks for your help:D

**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**

Thanks for your help :D

**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