If A=125e^-kt and A=200 when t=3, find the value of k.

99,882 results
1. Math

Find the interest rate. All rates are annual interest rates. 1. Principle \$400 rate 5% time 1 year A. \$10 B. \$20 C. \$40 D. \$200*** 2. Principle \$1000 rate 8.5% time 3 year A. 255*** B. 170 C. 22.5 D. 17 3. Principle \$200 rate 9% time 1/2 year A. 9 B. 18***

2. math

Which of the below data sets has the lowest standard deviation? You do not need to calculate the exact standard deviations to answer this question. 0, 1, 2, 3, 4, 5, 6 0, 25, 50, 100, 125, 150, 1000 0, 1, 3, 3, 3, 5, 6 0, 0, 0, 100, 200, 200, 200

3. physics =)

A 0.200 kg plastic ball moves with a velocity of 0.30 m/s. It collides with a second plastic ball of mass 0.100 kg, which is moving along the same line at a speed of 0.10 m/s. After the collision, both balls continue moving in the same, original direction.

4. statistics

A researcher is interested in estimating the average salary of teachers in a large urban school district. She wants to be 95% confident that her estimate is correct. If the standard deviation is \$1050 (σ = 1050), how large of a sample is needed to be

Which expression can be used to find the surface area of the following triangular prism? Options: A) 48+48+120+160+200 B) 24+200 C) 24+24+120+160+200 D) 24+24+200+120+120

6. math

The average number of calories in a 1.5 ounce chocolate bar is 225. Suppose that the distribution of calories is approximately normal with standard deviation =10. Find the probability that a randomly selected chocolate bar will have a) Between 200 and 220

7. math

You have been asked to build a ramp for Dan’s Daredevil Motorcycle Jump. The dimensions you are given are indicated below. Find the height and incline in feet. Round to the nearest foot One side is 200 ft.The angle between the hypotenuse and the side of

8. Math

Find the values of the 30th and 90th percentiles of the data. 129, 113, 200, 100, 105, 132, 100, 176, 146, 152 answer: 30th percentile = 113 90th percentile = 200 thank you.

9. Math

Find 30% of 70. a. 40 b. 21 *** c. 2.1 d. 0.4 Find 20% of 55. a. 22 b. 11 *** c. 35 d. 30 Find 12% of 200. a. 22 b. 24 *** c. 34 d. 40 What is the best estimate of 42% of 756? a. 320 *** b. 240 c. 400 d. 420 Find 11% of 400. a. 46 b. 40.6 c. 50.6 *** d. 56

10. Math

Hi I'm trying to do my graph and the numbers go from 50 100 150 200 250 300 there is a point missing between 200 and 250. How do I find the number between 200 and 250?

11. Math

To save money, you put \$200 in your bank account each week. After saving for 4 weeks, you have \$1,700\$ dollars in your account. Which equation models your savings account balance at the end of each week? A.) y-4=200(x-1700) B.) y-1700=200(x-4) C.)

12. statistics

The Boeing 757-200 ER airliner carries 200 passengers and has doors with a height of 72 inches. Heights of men are normally distributed with a mean of 69.0 inches and a standard deviation of 2.8 inches. If half of the 200 passengers are men, find the

13. Trigonometry

A wheel is rotating at 200 revolutions per minute .find the angular speed in radians per second. 200 rpm =200*2pi radians/1 minute (1 rotation = 2pi radians) = 400pi radians/60 seconds =20/3 radians/second You can follow the same procedure for the other

14. Pre-Algebra

A fair number cube, numbered 1 though 6 is rolled 200 times. About how many times can it be expected to on the number 4? I tried to do 200 divided by 6 which is 33.3333333333 and then I did 100 divided by 6, so then I tried to use a ratio, but I could find

15. Math

This question has two parts. Danielle's phone plan charges her \$30 per month for the first 200 minutes and then \$0.10 per minute for each subsequent minute. 1. Which of the following functions takes an input of any whole number value of x is greater than

16. Ap Chemistry

A 100.0 mL aliquot of 0.200 M aqueous potassium hydroxide is mixed with 100.0 mL of 0.200 mL of 0.200 M aqueous magnesium nitrate.

17. Math

1.(A)(i)Show that 2+4+6+8+..+2n=n(n+1). (ii)Find the sum of the first 200 even numbers. (iii)Find the sum of the first 200 odd numbers. (B)(i)Use the formula at the beginning of the question to find the sum of the first 2n natural numbers. (ii)Find a

18. Statistics

Question : The length of time(in hundreds of hours) for the failure of a transistor is a random variable Y with distribution function ; F(Y) = { 0 : if y=0 } Find the probability that the transistor operates for at least 200 hours. Skip to main content

19. A.P. Chemistry

You have solutions of 0.200 M HNO2 and 0.200 M KNO2 (Ka for HNO2 = 4.00  10-4). A buffer of pH 3.000 is needed. What volumes of HNO2 and KNO2 are required to make 1 liter of buffered solution? How does the henderson hasslebache equation help find the

20. math

please check this. 1. What is a reasonable distance between two cities? A.200 km* B.200 m C.200 cm D.200 mm 2. 6,501.5 km = ? m = 6,501,500 m. 3.Find the perimeter of the rectangle with length 97 inches and width 17 inches.228 in.* 211 in. 1,649 in. 114

21. maths

The enrollment of Kennedy High School dropped from 1200 to 1000 over a three-year period. What the percent of decrease during this time? A. 20 B 16 2/3 C. 25 D. 200 E. 2 My answer is 1200-1000=200 200/1200= 1/6 ( some wrong )

22. math

The perimeter of a rectangle is 200 m, and its area is 1875 m^2. Find its dimensions. i did: 2x+2y=200 2x/2=200/2-2y/2 x=100 -y (100-y)*y = 1875 y^2-100+1875=0 y^2 - 25y-75y +1875=0 y(y-25)-75(y-25)=0 (y-25)(y-75)=0 length= 75 width = 25

23. chemistry

Given this data in a study on how the rate of a reaction was affected by the concentration of the reactants Initial Rate, RUN #(A, M) (B, M) (C, M) (mol L-1 s-1 1 0.200 0.100 0.600 5.00 2 0.200 0.400 0.400 80.0 3 0.600 0.100 0.200 15.0 4 0.200 0.100 0.200

24. Statistics

A study in a particular state found that only 5% of the voters have Doctoral degrees. In a random sample of 200 voters, let x be the number who have doctoral degrees. 6) Find the mean of x. 7) Find the standard deviation of x. 8) Find the z-score for x >

25. math, calculus

Suppose that the total cost to produce 200 units of a consumer item is C(200) = \$3,789 and that the marginal cost at this production level is C'(200) = 16 dollars per unit made. Use this information to estimate the total cost C(205).

26. pre-calculus

the spread of oil leaking from a tanker is in the shape of a circle. If the radius r (in feet) of the spread after t hours is r(t)= 200 square root of t, find the area A of the oil slick as a function of the time t. You know that the area of a circle is

27. Math

You have been asked to build a ramp for Dan’s Daredevil Motorcycle Jump. The dimensions you are given are indicated below. Find the height and incline in feet. Round to the nearest foot One side is 200 ft.The angle between the hypotenuse and the side of

28. Math

The of the 45 numbers is 9.the average of the first 20 is 10 and the average of the last 24 is 8.find the 21st number. I have solved please check this. 9=x/45 ,so x=415. 10=x/20, x=200 and 8=x/24, x=192 So,415-(200+192)=23.answer Is this way and answer

29. Finance

What is the present value of the following payments? The interest rate is 8.5%. \$200 \$200 \$200 \$200 \$200+\$1,000 I--------I-------I-------I-------I-------I 0 1 2 3 4 5

30. Math

The quantity demanded for a certain brand of MP3 players is 200 units when the price is set at \$90. The quantity demanded is 1,200 units when the unit is \$40. Find the demand equation. For this problem, I set the points as (demand quantity, price). So my

31. Chemistry(Thank you for helping)

1) Given this data in a study on how the rate of a reaction was affected by the concentration of the reactants Initial Rate, RUN # (A), M (B), M (C), M mol L-1 s-1 1 0.200 0.100 0.600 5.00 2 0.200 0.400 0.400 80.0 3 0.600 0.100 0.200 15.0 4 0.200 0.100

32. math

The demand equation for the BWS Bluetooth wireless loudspeaker is p=-0.05x+200 where x is the quantity demanded per month and p is the unit price in dollars. Sketch the graph of the demand curve. How can I start? What points could I plot? So I am thinking

33. College engineering

A prismatic bar has length L = 2m and a circular cross-section with diameter d = 50 mm. A tensile load is applied which causes thhe bar to extend by ∂ = 1.4 mm. a) Find the normal strain. b)If the elastic modulus is 200 GPa, find the applied aal tensile

34. 9th grade algebra (recursive formula)

Can you explain how to find a sub 1 in the following problem? 1. Given 2 terms in an arithmetic sequence, find the recursive formula. a sub 18 = 3362 , a sub 38 = 7362 Steps: a. Find difference: (7632 - 3362)/(38 - 18) = 4000/20 = 200 b. plug into

35. Physics

A projectile is launched with 200kg m/s of momentum and 1000 J of kinetic energy. What is the mass of the projectile. The answer is said to be 20 kg but I can't get it. I tried this but it didn't work: p=mv=200 m=200/v I plugged that into this equation:

36. English

The price of each share is adjusted to \$25 = \$5000 / 200. The market capitalization is 200 × \$25 = \$5000, the same as before the split. --------------------------------------------------------- How do we read "/200"? 1. slash two hundred 2. per two

37. physics

The most massive of the shikansen are the series 200 trains, yet they are among the fastest. Series 200 trains can reach speeds of 275 km/h. If a 16-car series 200 trains has a maximum kinetic energy of 2.78 x 10^9 J, what is its mass?

38. physics

A steel bar of length L=2 m, with modulus E=200 GPa and constant cross sectional area A=200 mm2 is constrained between two walls at its two ends A and B. A distributed axial load, fx(x)=−p0(1−3x2L), with p0=200 kN/m, is applied to the bar only in the

Find the values of the 30th and 90th percentiles of the data. 129, 113, 200, 100, 105, 132, 100, 176, 146, 152 answer: 30th percentile = 113 90th percentile = 200 thank you

40. Math, Trig/Pre Calc

You have been asked to build a ramp for Dan’s Daredevil Motorcycle Jump. The dimensions you are given are indicated below. Find the height and incline in feet. Round to the nearest foot One side is 200 ft.The angle between the hypotenuse and the side of

41. Calculus

If A=125e^-kt and A=200 when t=3, find the value of k.

42. Algebra 2

Use Cramer's rule to find the number of items the company must sell each week to break even. y= 20x + 200 y= 25x D= |20 -1|. -20 - (-25) . |25 -1| D= 5 Dx= |200 -1|. -200 - 0 . |0 -1| Dx= -200 Dy= |20 200|. 0 - 5000 . |25 0 | Dy= -5000 x= Dx/D x= -200/5 x=

43. Statistics

Question : The length of time(in hundreds The length of time(in hundreds of hours) for the failure of a transistor is a random variable Y with distribution function ; F(Y) = { 0 : if y=0 } Find the probability that the transistor operates for at least 200

44. algebra

The total revenue R in dollars from selling tops for P dollars each is given by R= p(200-9) where p< or = 200. a) Find R when P = \$200 Find P when R = \$7500

45. College Algebra

The total revenue R in dollars from selling tops for P dollars each is given by R= P(200-p) where P < or = 200. Find R when P = \$200 Find P when R = \$7500

46. Math

What is 17% of 200? .17 x 200 = 34 What is the number 200 increased by 17%? 200 x 1.17 = 234 What is the number 200 decreased by 17%? The only way I knew to do this is based on the first question - since that answer was 34, I subtracted 34 from 200 and the

47. Pre-Algebra

Will make brainiest t the first two people that answer correctly with explanation a cart loaded with 12 boxes weighs a total of 200 lbs. the empty cart weighs 25 lbs. each box weighs x amount of lbs. which equation can be used to find the weight of one box

48. college algebra

One positive number is one-fifth of another number. The difference between the two numbers is 200, find the numbers. Im not sure how to approach this problem x-1/5 = x+200 ? I also keep wanting to divided 200/5 .. Please help Im all over the place not sure

49. Calc

The time interval T, in minutes, between patient arrivals in an emergency room is a random variable with exponential density function p(t) = 0:125e^-.125t. What is the average time between patient arrivals? What is the probability of two patients arriving

50. chemistry

Given this data in a study on how the rate of a reaction was affected by the concentration of the reactants Initial Rate, RUN # A], M [B, M C], M mol L-1 s-1 1 0.200 0.100 0.600 5.00 2 0.200 0.400 0.400 80.0 3 0.600 0.100 0.200 15.0 4 0.200 0.100 0.200

51. Algebra

Square lot. Sam has a lot that he thought was a square, 200 feet by 200 feet. When he had it surveyed, he discovered that one side was x feet longer than he thought and that the other side was x feet shorter than he thought. a). Find a polynomial A(x) that

52. Precalculus

From a point on ground level, you measure the angle of elevation to the top of a moutain to be 38 degrees. Then you walk 200 m fartheraway from the mountain and find that the angle of elevation is now 20 degrees. Find the height of the mountain. Round the

53. Math Triand HELP

A cart loaded with 12 boxes weighs a total of 200 pounds. • The empty cart weighs 25 pounds. • Each box weighs x pounds. Which equation can be used to find the weight of one box? A 12x + 25 = 200 B 12 + 25x = 200 C 12x + 25x = 200 D 12 + 25 + x = 200

54. horizontal asymptote

Find the horizontal asymptotes of the function's graph y = 200 / (1+10e^(0.5x)) If you let x --> minus infinty the exponential tends to zero and the function approaches 200. If x --> infinity then the exponential becomes infinite and therefore the limit is

55. Math

Here is the problem: Find the missing parts of 1/200. Here are my answers: Percent= 1/2% Fraction= 1/200 Decimal= .005. Is this correct?

56. pre algebra

14 is what percent of 200 100/200 =x/14 read as 100% is to 200 as x% is to 14 solve for x by cross multiplying x=7 check it .07 times 200 = 14 vola!

57. math

Determine whether each pair of fractions is proportional.. 5/12 = 8/20 find each unit rate 657,200 libary books/5,200 students

58. Math 116

Q1) there are two plans available, but they only have 38 homes available. write an equation that illustrates the situation. use x and y to denote plan 1 and plan 2. A1) X+Y=38 Q2)Plan 1 sells for \$175,000 and plan 2 sells for \$200,000. All available houses

59. linear programing.

plant warehouse SUPPLY __________1______2______3_______________ 5 8 6 1 250 3 2 3 2 200 5 3 4 3 200 demand 200 300 150 / oh oh..help please how to do this transportation cost problem thank you very much

60. Chemistry

How many grams of iron at 200.0 c must be placed in 200.0 g of water at 18.0 c so that the temp of both will be 30.0 c ? Okay so the SH of iron = .106 This is what I have set up.. Not sure if I'm going at this the right way.. (.106) (m) (170.0) = (1.0)

61. math

Hello, I am working on exponential equations of best fit. I have a table numbered from 1-7 with corresponding numbers. I put that into my calculator and came up with the exponential equation of best fit as y = 8.46(1.42)^x Now it wants to know how long it

62. Accounting

Sales Revenue: \$71,200 Cost of Goods Sold: (a) Gross Profit: \$30,000 Operating Expenses: (b) Net Income: \$12,100 Find the missing amounts. This is what I got: a) \$41,200 b) \$17,900 I am pretty sure I am doing this right. But before I move on with my

63. statistics

the weight of a watermelon is a random normal variable X with a mean of 200 and a variance of 50 Someone selects watermelons that weight in range of 200-k and 200+k with a probability of 60% what is the value of k?

64. Math

My son's homework asks us to find the product by factoring the tens. The problem is 6 x 2, 6 x 20 and 6 x 200. I see how to do 6 x 2 (memory factor) and the 6 x 20 would be (6 x 2) and (1 x 10) then 12 x 10 = 120 but how does he show his work for 6 x 200

65. Finance

You purchase a machine for \$50,000, depreciated straight-line to a salvage value of \$20,000 over its 6 year life. If the machine is sold at the end of the 6th year for \$27,000, what is the after-tax cash flow from the sale, assuming your tax rate is 40%?

66. math

If 1+2+3+...+200=x, what is (1+2+3+...+200)-(2+4+6+...+200)? (solution pls... tnx)

67. Physics

Water flowing through a 2.8 cm-diameter pipe can fill a 200 L bathtub in 5.8 min. Flow rate Q = volume/time = speed * cross section area Q=200/5.8=speed*.028....i get 1231.52 or Q=(200/348)=speed*.028...i get 20.52 both are wrong so what do i do? then i

68. English

1. We can live to be 200. 2. We can live to be 200 years old. 3. We can live up to 200. 4. We can live up to 200 years. 5. We can live to 200. 6. We can live to 200 years. 7. We can live up to 200 years old. 8. We can live to 200 years old.

69. chemistry

find the specific heat of lead using 200 g of pb at o degrees celcius and placing it in 200 g of water at 60 degrees celcius

70. Physics again sorry

A solenoid of 200 loops of wire that cover a length of 0.1 m. The solenoid carries a current of 4.0 A. What is the strength of the magnetic field inside the solenoid? In this instance do I assume that this time r is 200 x 0.1? Or is it still just 0.1 and I

71. Algebra

A homeowner wants to enclose a rectangular piece of land beside a river. He must put a fence on 3 sides of the field (the river forms the fourth side). The field has length L (which runs parallel to the river) and width W. The homeowner has 200 yards of

72. algebra

how would i find least common multiple of 20, 50 and 3 ? okay well you take the 50 and times it by ever number 50--> is it divisbile by 3 NO so not the least common multiple 50x2=100 --> is it divisible by 3 NO, so not the least common multiple 50x3=150

73. Math, Algebra II

Help would be great, it is for a "test" to see what we know, so it is not worth anything but I still would like to see if I can make changes to it before I submit it. :D 3.) Select the equation that has infinitely many real solutions. (these are all

74. another problem for checking - algebra

P dollars is invested at annual interest rate r for 1 year. If the interest is compounded semiannually, then the polynomial P(q + r/2)^2 represents the value of the investment after 1 year. Rewrite w/o parenthesis and eval if P= \$200 and r = 10% P(1 +

75. Algebra 2

Are these correct...Please help 1. The cost, in millions of dollars, to remove x % of pollution in a lake modeled by a. What is the cost to remove 75% of the pollutant? C=6,000/(200-2X) C=6,000/(200-2*.75)) C=6,000/(200-1.5) C=6,000/198.5 C=30.23 Million

76. Algebra II repost

Solve: -x^4 + 200 = 102x^2 -x^4-102x^2+200=0 (-x^2)^2-102(x^2)+200=0 (x^2-51)(x^2+51)(x-20)(x-10) I'm stuck at this point

77. Physics

Find the average velocity (in m/s) of an object that starts 200 meters north of town and is 1200 meters north of town after 200 seconds.

78. Statistics

How do I plug this into the Binomial Probability Formula? prob(lost) = 5/1000 = 1/200 prob(not lost) = 199/200 prob( 2 of 22 are lost) = C(22,2) (1/200)^2 (199/200)^20 = .005224..

79. Chemistry

What combination of volumes (ml) of C2H4 and O2 are required to obtain 400ml of CO2? All volumes are measured at STP. 1. 100,300 2. 200,600 3. 200,200 4. 300,300

80. Physics

Water flowing through a 2.8 cm-diameter pipe can fill a 200 L bathtub in 5.8 min. Flow rate Q = volume/time = speed * cross section area Q=200/5.8=speed*.028....i get 1231.52 or Q=(200/348)=speed*.028...i get 20.52 both are wrong so what do i do?

81. Chemistry

So my chem professor had a slide with a question that follows: If you combine 100 ml of 0.10 M HCl and 100 ml of 0.10 M NaOH, and find that the temperature goes up 0.67 degrees K  What is ΔH° for the reac/on: OH(aq)- + H+(aq)->H2O(l)(c H2O= 4.18 J/°C

82. Reserach Statistics in CRJU

A data set has n=10 pairs of X and Y values. This data has SSx=10, SSy= 20 and SP=10. Compute the Pearson correlation and explain r=sp/√ssx ssy = 10/√10*20= 10/√200 Simplify 200 under radical= 200 as 10^2⋅2. √(〖10〗^2 )×2= 10/10√2 or

83. physics

There are roughly 8000 wildfires in Canada each year. To help fight the fires, planes are used to drop water and fire retardants on the flames. One such plane flies horizontally over a fire at a speed of 60 m/s and drops a giant water balloon to help

84. Calculus

Find two numbers such that the sum of the first plus three times the second is 600 and their product is a maximum. x + 3y=600 xy is a max. This is the problem statement. let U be the function equal to xy. U=xy = y(600-3y) Now, maximize U (take derivative,

85. maths

A car hire company makes the following charges: •A one-off charge of £20: •A charge of £25 for each day that the car is hired. •A charge of 10p for each mile that car is driven. Write down a formula that gives the total cost (£C) of hiring a car

86. engineering science

a bale of weight 200 newtons hanged at the end of a rope.find the acceleration of the bale if the tension in the rope is 200 newtons,150 newtons,300 newtons.

87. Physic

A steel bar of length L=2 m, with modulus E=200 GPa and constant cross sectional area A=200 mm2 is constrained between two walls at its two ends A and B. A distributed axial load, fx(x)=−p0(1−3x2L), with p0=200 kN/m, is applied to the bar only in the

88. math

A stock that sold for \$240 per share before a week began had the following gains and losses in share price over the course of that week. Monday ( - 2 3/4 ), Tuesday ( - 3 1/8 ), Wednesday ( + 1 1/8 ), Thursday ( + 5 ), Friday ( - 2 1/4 ). Suppose an

89. Math

1. you deposit \$200 into a savings account with interest compounded. annually, the expression 200(1+R)^ 2, where R is the interest rate, gives the account balance after 2 years. Expand this expression and simplify. Find the account balance if R=0.04.

90. Genetics

Genes: Brown = B Big eyes = E Small ears = S Frizzy hair = F These 4 phenotypes B, E, S, F are dominant. Recessive alleles = b, e, s, f Assume that all 4 genes are present on the same chromosome and 1) Be/bE and be/be resulted in 400 Be/bE, 300 be/be, 200

91. Finance (after-tax cost)

Assuming a tax rate of 50%, the after-tax cost of a \$200,000 dividend payment is? A. \$200,000 B. \$100,000 C. \$-100,000 D. none of the above O.K., given a \$200,000 after-tax dividend payment and a 50% tax bracket. That means the company had at least

92. pharma medicines

a dose of beclomethasone inhalant is 200mcg twice a day. the commercial inhaler delivers 50mcg per inhalation and contains 200 inhalations.how many inhalers should be dispensed to a patient if a 60-day supply is prescribed? At 50 mcg per inhalation, 200

93. calc

Suppose the marginal cost is C′(x) = e^−0.3x , where x is measured in units of 200 items and the cost is measured in units of \$10,000. Find the cost corresponding to the production interval [200, 1,000]. Round to the nearest dollar.

94. math

Find the given percent of each number.Show your work. a.25% of 120 b.80% of 120 c.120% of 80 d.70% of 150 e.150% of 200 f.200% of 150

95. algebra

1. The cost, in millions of dollars, to remove x % of pollution in a lake modeled by C=6000/(200-2x). a. What is the cost to remove 75% of the pollutant? C=6000/(200-2(.75)) C=6000/(200-1.5) C=6000/198.5 C=30.2 Is this correct? This is stumping me to: For

42 is 200 percent of what number? So I put 42 over 100 is equal to 200 over x? Is this right? Can someone explain? Thank you -Allyson

97. algebra

the number of people the school can hold is at most 200. how can i present this in inequality is this correct x=

98. CONTEMPORARY MATH

HOW DID THEY GET THIS ANSWER? PHYSICAL INVENTORY OF PICTURE FRAME WAS TAKEN AT TARGET THEY FOUND THERE WAS 700 WAS REMAINING WHAT WAS THE INVENTORY PRICING? IT GOES ON TO GIVE THE STRATEGY JAN 1 BEGIN INVEN. 400 UNITS @ \$5.00 = \$2000.00 APRIL 9 PURCHASE

99. math,probability

I only need someone to check my answers for two questions. 1) In a survey of 1000 people about emergency living expense savings .... the following results were retained (basically the number of months the person could live on savings): Group 1 2 3 4 Time

100. Reiny

Solve: -x^4 + 200 = 102x^2 I know the last line was wrong I just took a guess on factoring it out. I just knew how to do the first 2 lines. The problem has no typos it is -x, its crazy but that's how it is in my book. how does that change the answer? "Your