1. Algebra ASAP

The half-life of krypton-91 ^(91Kr) is 10 seconds. At time t = 0 a heavy canister contains 6 g of this radioactive gas. (a) Find a function m(t) = m02^−t/h that models the amount of ^(91)Kr remaining in the canister after t seconds. m(t) = (b) Find a

2. Urgent math

The initial size of a culture of bacteria is 1000. After one hour the bacteria count is 4000. (a) Find a function n(t) = n0ert that models the population after t hours. n(t) = b)Find the population after 1.5 hours. (Round your answer to the nearest whole

3. math

A grocer wishes to blend two different coffee brands because he wants to make a blend of 480 pounds to sell at \$2.68 a pound. If he uses a brand of coffee worth \$2.50 a pound with another brand worth \$2.80 a pound, how many pounds of each does he use?

4. Urgent math

population growth model. Can anybody please help me out in trying to solve this problem? It's my homework and I don't seem to understand what I am getting. The count in a culture of bacteria was 400 after 2 hours and 25,600 after 6 hours. (a) What is the

5. Chemistry

Water is sprayed on oranges during a frosty night. If an average of 11.8 g of water freezes on each orange how much heat is released. Can you please help me set this problem up. I don know what formula to use? thank you

6. Equilibrium

An equilibrium mixture at 852 K is found to contain 3.61*10^-3 mol/L of SO2, 6.11*10^-4 mol/L of O2, and 1.01*10^-2 mol/L of SO3. Calculate the equilibrium constant Keq, for the reaction where SO2 and O2 are reactants and SO3 is the product. Equation would

7. physics

A projectile is fired from a cliff 300 m high with an initial velocity of 400 m/s. If the firing angle is 30 degrees from the horizontal, compute the horizontal range of the projectile.

8. calc

Use the graph of f(t) = 2t + 4 on the interval [−4, 6] to write the function F(x), where f of x equals the integral from 2 to x of f of t dt.

9. calc

Use the graph of f(t) = 2t + 4 on the interval [−4, 6] to write the function F(x), where f of x equals the integral from 2 to x of f of t dt.

10. Chemistry

1.00g of oxygen combine with 0.126 g of hydrogen to form H2O. 1.00 g of nitrogen combie with 0.216 g of hydrogen to form ammonia. Predict the weight of oxygen required to combine with 1.00 g nitrogen to form an oxide.i m a student

11. Chemistry

The percent is confusing me, can you please help me set this equation up. How much heat is liberated when 5.00 kg of coal is burned if the coal is 96.2% carbon by mass and the other materials in the coal do not react? (delta)H comb of carbon is -394kJ/mol

12. Physics

A lighted candle is placed 38 cm in front of a diverging lens. The light passes through the diverging lens and on to a converging lens of focal length 10 cm that is 5 cm from the diverging lens. The final image is real, inverted, and 19 cm beyond the

13. Algebra ASAP

Suppose that \$17,000 is invested in a savings account paying 5.1% interest per year. (a) Write the formula for the amount A in the account after t years if interest is compounded monthly. A(t) = (b) Find the amount in the account after 3 years if interest

14. College Algebra

This exercise uses the radioactive decay model. A wooden artifact from an ancient tomb contains 80% of the carbon-14 that is present in living trees. How long ago was the artifact made? (The half-life of carbon-14 is 5730 years. Round your answer to the

15. Urgent math

please help The fox population in a certain region has a relative growth rate of 7% per year. It is estimated that the population in 2005 was 19,000. (a) Find a function n(t) = n0ert that models the population t years after 2005. n(t) = (b) Use the

16. College Algebra

This exercise deals with logarithmic scales. Earthquake A had a magnitude of 8.2 on the Richter scale. At the same time an earthquake B with magnitude 4.8 caused only minor damage. How many times more intense was earthquake A than earthquake B? (Round your

17. Physics

Force of 2.25N is acting on charge 15x10^-4C at any point. Find the Electric Field Intensity at that point.

18. Physics

A convex mirror (f1 = −6.30 cm) and a concave mirror (f2 = 9.50 cm) are facing each other and are separated by a distance of 24.0 cm. An object is placed between the mirrors and is 12 cm from each mirror. Consider the light from the object that reflects

19. life science

Investigation to determine whether expired air contains carbon dioxide how should state the method,step by step for the experiment

20. Math

jack and jerry can complete a job together in 4 hours. if jack require 6 hours to do the job alone, how many hours will it take jerry to do the job alone. A.12 B.10 C.8 D.6 E.4

21. Trigonometry

A segment of height 3 inches (distance from center ofchord to center of arc) has an arc of .4 radian.find the area of a segment.

22. Math

Julia spent 1/3 of her birthday money. Then she lost 1/2 of the rest. She now has \$10.00 dollars left.how much did she get for her birthday.

23. Math

Sara is making cookies and the recipe calls for 2 1/2 (2.5) cups of sugar to make two dozen cookies. How many cups of sugar will she need to make five dozen cookies? Express the answer as a mixed fraction and as a decimal

24. Chemistry

1.00g of oxygen combine with 0.126 g of hydrogen to form H2O. 1.00 g of nitrogen combie with 0.216 g of hydrogen to form ammonia. Predict the weight of oxygen required to combine with 1.00 g nitrogen to form an oxide.

25. HISTORY,GEOGRAPHY,MATHS LIT,LIFE ORIENTATION,...

OK HEY,,,IM LOST I DON'T KNOW WHAT TO DO NEXT YEAR BECAUSE IM CURRENTLY DOING MY LAST YEAR AT HIGH SCHOOL SO HELP ME,,WHAT MUST I DO?

26. physics

a stone projected horizontally from the top of a tower with a speed of 4m/s lands on the level ground at a horizontal distance 25m from the foot of the tower. calculate the height[g=10m/s2]. is it u squared divided by 2g

27. Urgent math

g(x) = log3(x + 3) state its domain, range, and asymptote. i am having trouble with this can somebody help me?

28. Chemistry

Can you please help me with this problem, I am so confused, and I do not know how to set it up, what equation to use, and what do i need to convert. 1 Transportation Ethanol is being used as an additive to gasoline. The combustion of 1 mol of ethanol

29. Physics

charges of -6nC and 4nC are 3m apart.(a)Determine the force they exert on each other.(b) the net electric field intensity at a point midway between them.

30. English

Archetypes frequently appear in literature with - a- contradictory themes b- general themes c- universal themes d- specific themes my answer is D

31. Urgent math

i need help with these two homework problems Use the Laws of Logarithms to combine the expression into a single logarithm log2 5 − 5 log2 x + 1/2 log2(x + 1) Solve the logarithmic equation for x log2(x + 2) + log2(x − 1) = 2

32. chemistry

Could you please tell me the objective, theory and mechanism,result, precautions and applications of following experiment : reaction of 4-aminotoluene and o-vanillin(preparation of azomethine)

33. life orientation

List and discuss any four factors that could threaten or limit the core functions of the media

34. Precaculculus

Suppose you are told that log(2)=0.3562 and log(3)=0.5646. All of them with the base of 'a'. Find: i) log(6) ii) log(9) Solutions i) log(6)= log (3)(2) = log 3 + log 2 = 0.5646 + 0.3562 = 0.9208 ii)log(9)= log 3^2 = 2 log 3 = 2 (0.5646) = 1.1292

35. Geometry

What is the Midpoint of CD given the coordinates C(-4,8) and D(8,-4)?

36. Life science

Why are thesa fossils important discoveries?

37. Leshikishiki

Research on processes of campaigns and protests

38. Equilibrium

The following reaction has an equilibrium constant (Keq) of 160. 2 NO2(g) 2 NO(g) + O2(g) What will be the reaction quotient (Q) and in which direction will the reaction proceed if the partial pressure of NO2 is 5.0*10^-4 atm, NO is 0.080 atm, and O2 is

39. Equilibrium

An aqueous solution of carbonic acid reacts to reach equilibrium as described below. H2CO3(aq) + H2O(l) HCO3^-(aq) + H3O^+(aq) The solution contains the following solute concentrations: Carbonic Acid: 3.3*10^-2 mol/L HCO3^-: 1.19*10^-4 mol/L H3O^+:

40. JNV

An isotope has a 12.4 hrs half-life. If it has an activity of 30mCi at noon today, what was its activity at 3 pm yesterday?

41. life science

At high altitude the atmospheric pressure is lower and the air is less dense than at low altitude.this means that at high altitude there is less oxygen available for gaseous exchange thus gas exchange becomes less efficient. what conclusion can be

42. Chemistry

Given the following reaction: 3 H2(g) + N2(g) 2NH3(g) + heat If the following changes were to occur what direction shift will it have (left or right) And what will be the reason of the shift Changes/Stress on system: Adding NH3 Decreasing the pressure

43. Chemistry

Given the following reaction: 3 H2(g) + N2(g) 2NH3(g) + heat If the following changes were to occur what direction shift will it have (left or right) And what will be the reason of the shift Changes/Stress on system: Adding NH3 Decreasing the pressure

44. Chemistry

Any student is welcome to use this for extra practice and anyone is welcomed to amswed the question. Here is a couple of practice problems a) 2 N2O(g) + O2(g)  4 NO(g) B) H2(g) + CO2(g)  H2O(g) + CO(g) C) 4 HCl(g) + O2(g)  2 Cl2(g) + 2

45. math

I watched 1000 ants build an anthill in 5 hours. Working at the same rate, 2500 ants could have built the anthill in ? hours? A. 1 B. 2 C. 3 D. 4 I made a proportion of 1000/5=2500/x, and got 12.5, but that's not a choice. HELPS!

46. physics

In Example 5.8 in the text book, we investigated the apparent weight of a fish in an elevator. Now consider a 72.0 kg man standing on a spring scale in an elevator. Starting from rest, the elevator ascends, attaining its maximum speed of 1.20 m/s in 0.80

If you have several calls coming in at one time, you should: A. ask someone else to help you. B. answer each call as soon as possible, saying, "Good Morning, Mr. Smith's office, will you hold, please?" C. handle one call at a time. D. answer each call by

48. College Algebra

4 + 5^6x = 8 (a) Find the exact solution of the exponential equation in terms of logarithms. x = (b) Use a calculator to find an approximation to the solution rounded to six decimal places. x = can any body help me out here please?

49. pre-cal

Change of Base Formula logb x = loga x/loga b to evaluate log14 41. (Round your answer to three decimal places.) i need a step by step preview please

50. math

Solve using suitable property [name the property] 1]428 x[-23]+[-428]x(-223) 2] 105 x(-37)

51. english

. A sinking fund is the accumulated amount to be realized at some future date (the end of the term) when a fixed number of periodic payments are paid into an account earning interest at the rate of i per period

52. maths

decimals, exponent

53. Algebra

Solve the exponential by expressing each side as a power of the same base and then equating exponents. 5^x-2/4=squaroots 5 please help. Thanks!

54. Filidi senior secondary school

Please analyse the following statement "The media do not tell us what to think but they tell us what to think about ".

55. history

the war powers resolution is possibly unconstituional because of what

56. NURSING ASAP

Is nursing considered a a science major because I'm taking this course called "CHEM 1001 Chemistry and the World Around Us?" and I studying nursing in college. Please be honest. Thank you! :)

58. Math

The supplement of an angle measures 11 times its complement. Then the measure of the angle is... A. 9 degrees B. 81 degrees C. 90 degrees D. 99 degrees E. 100 degrees

59. Urgent chemistry

Given the following reaction: 3 H2(g) + N2(g) 2NH3(g) + heat If the following changes were to occur what direction shift will it have (left or right) And what will be the reason of the shift Changes/Stress on system: Decreasing the pressure Adding heat

60. Life orientation

What is the following statement mean? In terms of media. "media do not tell us what to think but they tell us what to think about"

61. math

3^200/3^50 a. 4 b. 150 c. 3^4 d. 3^150

62. Algebra

5(a - 7) + 7= 2(a - 5) 5a -2a= 3a 14 - 5 = 9 Am I doing it right? a = 27

63. accounting

A doctor's office paid \$18,000 on insurance for a full year. What will be the balance of the prepaid expense after 8 months?

64. english

How can animated jungle animals, sea creatures, fairies, cars and other non-human characters can be used to represent race?

65. math

WHAT ARE THE QUESTION IN BUSMATH?

66. Differential Equations

Solve x(dy/dx)=(y^2)/(1-y log x).

67. Math

Suppose that a certain material has a half life of 25 years, and there are A(t)=10(1/2)^t/25 grams remaining after t years. find: i) initial amount i) Amount after 80 years Solutions i) A(0)=10(1/2)^(0/25) =10(1/2)^0 =10(1) =10 ii)A(80)=10(1/2)^(80/25)

68. ENN103F

How can animated jungle animals, sea creatures, fairies, cars and other non-human characters can be used to represent race

69. physics

In a gas two waves of length 1m and 1.10m have a frequency difference of 10/3 Hz, the velocity of sound is ? a) 166m/s b) 332m/s c) 83m/s d) 336.7m/s

70. English

Is a clause a part of speech? My answer is no.

71. kgothala s school life orintation

meaning of campain with responsibility

72. probability

the set s={x|x2+4x-5=0}

73. math

If a line whose x- and y- intercepts are equal does not pass through the origin, then its slope must be A. 0 B. 1 C. -1 D. undefined I'm thinking it's 0, I don't know though.

74. math

The result of adding a number to itself is usually unequal to the result of multiplying the number by itself. For how many different numbers are these results equal? A none B. one C. two D. four

75. Chemistry

1)During an endothermic reaction, total energy A. decreases. B. increases. C. stays the same. D. cannot be determined. 2)The enthalpy of formation of an element is A. negative. B. positive. C. zero. D. negative or positive, depending on which element. i

76. math

If a line whose x- and y- intercepts are equal does not pass through the origin, then its slope must be A. 0 B. 1 C. -1 D. undefined I'm thinking it's 0, I don't know though.

77. ENN 103F

HOW CAN ANIMATED JUNGLE ANIMALS, SEA CREATURES, FAIRIES, CARS AND OTHER NON-HUMAN CHARACTERS BE USED TO REPRESENT RACE?

78. ENN 103F

explain dr charles da costa's theory on racial stereotyping