# janice

Most popular questions and responses by janice
1. ## Algebra

Under ideal conditions, a population of e. coli bacteria can double every 20 minutes. This behavior can be modeled by the exponential function: N(t)=N(lower case 0)(2^0.05t) If the initial number of e. coli bacteria is 5, how many bacteria will be present

2. ## Algebra

Farmer Ed has 9,000 meters of​ fencing, and wants to enclose a rectangular plot that borders on a river. If Farmer Ed does not fence the side along the​ river, what is the largest area that can be​ enclosed?

3. ## Probability

A salesperson contacts eight potential customers per day. From past experience, we know that the probability of a potentail customer making a purchase is 0.10. a) What is the probability the salesperson will make at least two sales in a day? -Do you use

4. ## Algebra

The CarryItAll​ mini-van, a popular vehicle among soccer​ moms, obeys the demand equation ppequals=negative StartFraction 1 Over 40 EndFraction x plus 19 comma 000−140x+19,000. The cost of producing xx vans is given by the function Upper C left

5. ## Probability

A department store has determined that 25% of all their sales are credit sales. A random sample of 75 sales is selected and the proportion of credit sales in the sample is computed. a) What is the probability that the same proportion will be greater than

6. ## Algebra

A golf ball is struck by a​ 60-degree golf club at an initial velocity of 84 feet per second. The height of the golf ball in feet is given by the quadratic function h(x)= 16 x^2/(42)^2+72.7/42x where x is the horizontal distance of the golf ball from the

7. ## math

How many 50 centimeter pieces of ribbon can Casey cut from a roll of 60 meters long?

8. ## health

Which of the following is true in regard to limited data sets? A.Patients must authorize the use of limited data sets. B. Those who receive limited data sets can pass them on witout restrictions. C. Limited data sets cant include a patiemts city, state,

9. ## Algebra

what is the interest rate necessary for an investment to quadruple after 5 years of continuous compound interest? I keep getting r=11%

10. ## Algebra

A club currently has 300 members who pay $400 per month for membership dues. The​ club's board members want to increase monthly revenue by lowering the monthly dues in hopes of attracting new members. A market research study has shown that for each$ 1

11. ## Physics

A plane intends to north with a speed of 250 m/s relative to the ground through a high altitude cross wind of 50 m/s coming from the east. Determine the bearing that the plane should take( relative to due north), A) the planes speed with respect to the air

12. ## trig

A plane is flying with an airspeed of 150 miles per hour and heading 155°. The wind currents are running at 25 miles per hour at 160° clockwise from due north. Use vectors to find the true course and ground speed of the plane.

13. ## Science

What is the length of an aluminum rod at 65 C if its length at 15 C is 1.2 meters? I will be happy to critique your thinking. New length= oldlength(1+alpha*(65-15)) where alpha is the coefficent of linear expansion of aluminum 1.201386 meters

14. ## algebra

A rancher has 4 comma 7004,700 feet of fencing available to enclose a rectangular area bordering a river. He wants to separate his cows and horses by dividing the enclosure into two equal areas. If no fencing is required along the​ river, find the length

15. ## trig

A ship is headed due north at a constant 20 miles per hour. Because of the ocean current, the true course of the ship is 15°. If the currents are a constant 18 miles per hour, in what direction are the currents running? (Enter your answers as a

16. ## Probability 2

Between 11 P.M. and midnight on Thursday night, Mystery Pizza gets an average of 4.2 telephone orders per hour. Find the probability that, a. at least 30 minutes will elapse before the next telephone order b. less than 15 minutes will elapse c. between 15

17. ## Algebra

The price p and the quantity x sold of a small​ flat-screen television set obeys the demand equation below. ​a) How much should be charged for the television set if there are 80 television sets in​ stock? ​b) What quantity x will maximize​

18. ## Social Studies

Please check my answers :) 1.Which statement about ethnic groups in Southwest Asia is accurate? A. Arabs are the majority in every country in the region. B. Arabs are the largest ethnic group in the region.**** C. Kurds make up the largest ethnic group on

19. ## Math

Write fact families for the numbers in 30 and 31.how are the fact families different

21. ## trig

A plane has an airspeed of 190 miles per hour and a heading of 24.0°. The ground speed of the plane is 214 miles per hour, and its true course is in the direction of 40.0°. Find the speed and direction of the air currents, assuming they are constants.

22. ## math

If 3 different digits represent 3 different letters and each time a letter appears it represents the same digit how do i find the sum of the 3 digits represented? p is not zero. pm pm pm +pm ____ ap

23. ## trig

A 52-foot wire running from the top of a tent pole to the ground makes an angle of 57° with the ground. If the length of the tent pole is 44 feet, how far is it from the bottom of the tent pole to the point where the wire is fastened to the ground? (The

24. ## physics

a) In raising a 4800 N piano with a pulley system, the workers note that for every 2 m of rope pulled down, the piano rises 0.3 m. Ideally, how much force is required to lift the piano? (b) If the workers actually pull with 2500 N of force to lift the

59. ## algebra

Jim wants to build a rectangular parking lot along a busy street but only has 1 comma 9001,900 feet of fencing available. If no fencing is required along the​ street, find the maximum area of the parking lot.

60. ## Calculus 2

∫ tan^2 (x) sec^4 (x) dx ∫ [tan^2 (t) + tan^4 (t)] dt ∫ [1-tan^2 (x)] / [sec^2 (x)] dx Trigonometric integral Please show steps so I can understand!

61. ## Physics

A jet plane lands with a velocity of 100 m/s and can accelerate at a maximum rate of -5.0 m/s2 as it come to rest. Can this plane land at an airport where the runway is 0.80 km long?

62. ## math

Suppose that 25% of all wise people are nice and half of all the nice people are wise. Suppose further that 25% of all the people are neither wise nor nice. What percent of all the people are both wise and nice?

63. ## Algebra

Form a third degree polynomial function with real coefficients such that 2+i and -5 are zeros. f(x)= ?

64. ## Physics

How will mechanical energy affect different points of oscillation on a vertical spring? Well i know that mechanical energy is PE and KE...So when the spring is compressed the mechanical energy will equal the PE and when extended or stretched it will equal

65. ## Chemistry-confused

All alkalis produce hydroxide ions when dissolved in water. How do we write the chemical equation for aqueous ammonia? I see some textbooks write it as ammonia gas dissolving in water to form ammonium ions and hydroxide ions. NH3(g)+ H2O(l) ==> NH4+(aq) +

66. ## algebra

tell whether x and y show direct variation and explain reasoning

67. ## Physics

if a car is moving around a circular track at a constant speed of 55 mi/h, is there a net force acting on the car?

68. ## Statistics

A recent article in a computer magazine suggested that the mean time to fully learn a new software program is 40 hours. A sample of 100 first-time users of a new statistics program revealed the mean time to learn it was 39 hours with the standard deviation

69. ## Chem

A gas has density of 1.977 g/dm3 at STP (a) what is its molecular mass? (b) what is its density at 77¢XC and 0.95 atm pressure? (c)If the gas is an oxide and has the formula XO2, what is the atomic mass of X

70. ## trig

Find all solutions to the following triangle. (Round your answers for angles A, C, A', and C' to the nearest whole number. Round your answers for sides c and c' to two decimal places. If either triangle is not possible, enter NONE in each corresponding

71. ## chemistry

consider the reaction between copper metal and chlorine gas producing solid copper(1) chloride. when 16.2g of copper is reacted in an excess of chlorine, how many grams of copper(1) chloride will be produced

72. ## Math

A juice concentrate containing 65% solids is added to a single-strength juice solution(containing 15% solid), in order to generate a final product which contains 45% solids. Calculate the amounts required for the concentrate and for the single strength

73. ## physics

A weight lifter lits a 1250 pound barbell 2 meters in 3 seconds. How much power was used to lift the barbell

74. ## Science

A sliver bar 0.125 meter long is subjected to a temperature change from 200C to 100C.What will the length of the bar after the temperature change? See the aluminum question. I will be happy to critique your work and thinking. A silver bar 0.125 meter long

75. ## Quantitative Statistic

Pennsylvania Refining Company is studying the relationship between the pump price of gasoline and the number of gallons sold. For a sample of 20 stations last Tuesday, the correlation was .78.   At the .01 significance level, is the correlation in the

76. ## physics

Consider the line passing through the center of the cue ball as the x axis. At the point of collision with the solid ball on the table, a line passing through the centers of the cue ball and the solid ball form a 45° angle with the X axis. Assume no

99. ## Finite Math

: Four cards are drawn without replacement from a well shuffled standard deck of cards. Let X be the number of aces drawn. 12. What are the possible values of the random variable X? Write them in increasing order as a set using roster (or list) notation.

Playing game of chance and pay 300 by rolling a fair die one time if you rome a 2 and receive $1300 if you roll a 4 or six you receive$900 if you ore a 3 5 or 9 receive nothing. find expected value for this game. based on value is it a good game to play?