1. math

A certain antibioyic reducesthe number of bacteria in your body by 10% each dose a) if four doses of the antibiotic are taken, what percent of the original bacterial population is left. b) biologists have determined that when a person has a bacterial

2. Physics

An attack helicopter is equipped with a 20- mm cannon that ﬁres 198 g shells in the forward direction with a muzzle speed of 711 m/s. The fully loaded helicopter has a mass of 4810 kg. A burst of 75.3 shells is ﬁred in a 6.27 s interval. What is the

3. maths

Robin says , 'If Jai gives me Rs. 40, he will have half as much as Atul , but if Atul gives me Rs. 20, then the three of us will all have the same amount. ' What is the total amount of money that Robin, Jai and Atul have between them ?? please explain

4. physics

In a particular crash test, an automobile of mass 1369 kg collides with a wall and bounces back oﬀ the wall. The x components of the initial and ﬁnal speeds of the automobile are 10 m/s and 1.9 m/s, respectively. If the collision lasts for 0.18 s,

5. Math

Weatherwise is a magazine published by the American Meteorological Society. One issue gives a rating system used to classify Nor'easter storms that frequently hit New England and can cause much damage near the ocean. A severe storm has an average peak wave

6. GEOMETRY HELPPPPP MEEEE PLEASSEEEEE!!!

Find the lengths of the diagonals of this trapezoid. trapezoid on a graph with points (-a,0), (-b,c), (b,c), (a,0) negative a and b are on the left side (a is on bottom and b is on top) and positive a and b are on the right side (a is on bottom and b is on

7. physics

A bobcat jumps with a speed of 5m/s at an angle of 55 degrees. How long does the bobcat stay in the air?

8. Math

In the accompanying diagram, abcd is a rectangle with ab as a diameter of semicircle o. Diagonal bd is drawn in rectangle abcd. The length of bd exceeds the length of ab by 1, and ad=5. Please help thank you

9. math

IN THE FIGURE,^ACP=40 DEGREE AND ^BPD=120 DEGREE.THEN FND ^CBD

10. science

A boy standing on top a building with a height of 500m throws a ball vertically upwards. The balls take 40s to reach to the ground. Neglecting the height of the boy throwing the ball, determine the velocity of the ball.

11. maths --plse help me..

In a parallelogram ABCD, diagonals AC & BD intersect at O. E, F, G, & H be the midpoints of sides AO, DO, CO & BO. Find the ratio of (EF+GH+HG+EH) TO (AB+BC+CD+AD).

12. entrepreneur

Explain the reasons that a small business might fail and explain the factors/characteristics that contribute toward small business success.

13. chemistry

(c) Calculate the degree of polymerization n of polystyrene with a molecular weight of 3.091×106 g/mol.

14. chemistry

(c) What is the value of the degree of polymerization n of isotactic PB with a molecular weight of 3.091×105 g/mol?

15. maths

There are three mixtures of equal capacity and all are completely filled with acid and water mixtures in diferent ratios. The ratio of acid to water in the first container is 2:3 ,in second 3:7 and third 4:11. If the mixtures of all the containers are

16. Math

If 20% of a number is equal to 3x, then the number is. Please help thank you

17. Astronomy

At opposition, Saturn is observed to subtend an angular radius of 9.16 arcseconds (not including the rings). Use this and the conversion factors in our Table of Constants to find the radius of Saturn in km, rounded to three significant digits.

18. Math

The math problem is set up as a fraction in parenthesis 6 over 4. Evaluate the expression (6/4)

19. Math

From a survey of 200 college students, a marketing research company found that 130 students owned iPhones, 70 owned cars, and 60 owned both cars and iPhones. (a) How many students owned either a car or an iPhone (but not both)? _______students (b) How many

20. maths --plse help me..

a circle enclose a rectangle of side 6cm and 8cm. what is the perimeter of the circle?

21. maths

ABCD ia a parallelogram whose diagonals intersecting at E. AC is produced to F such that CF=AE. Prove that ar(BDF)=ar(parallelogram ABCD)

22. survey of sciences

1. Explain what happens to the G-force as the speed of the centrifuge increases.

23. Astronomy

We observe that oppositions of Saturn repeat every 378 days. Use this information to find the sidereal period of Saturn. Express your answer in years and round to two significant digits.

24. Astronomy

The volume of a ball is given in terms of its radius by V=4π3R3. Use this to find the average density of Saturn, i.e. the mass per unit volume. Use Earth’s mass in kg from the Table of Constants to express your answer in kgm3. Note for comparison that

25. Astronomy

Consider the same asteroid initially in the asteroid belt at a distance 3 AU from the Sun, and 2 AU from Earth, which collides with Earth. As it falls towards Earth, it acquires kinetic energy (neglect its initial motion) both by being accelerated towards

26. Music

How are the sounds turned into notes? A) By increasing the amount of air blown into the blow hole B) By decreasing the amount of air blown into the blow hole C) By changing the position of the mouth on the blow hole. D)By pressing the keys My answer is D

27. Math 116

five times a number decreased by twice the same number

28. maths stats

For each day of the 5-day working week Tom can choose any one of 6 newspapers to read at the lunchtime. (i) How many different choices are possible in a week? (ii) If Tom wants to read a different title each day, then how many different choices are

29. Math

The diameter of an atom is 2.3 x 10^ -8 centimeters. How many atoms can fit in a space .003 centimeters long, without exceeding it? Please help, thank you

30. statistics

a research wanted to test a new diabetes drug: what level of significance would she use in testing?

31. maths

Express sin 2x cos 4x as a sum of trigonometric functions.

32. math

The probability of event A is 5/8. The probability of event B is 2/5. Explain why A and B cannot be mutually exclusive events.

33. Astronomy

Saturn’s Moon Janus is observed to orbit the planet with period 0.695 days, grazing the planet with an orbital radius only 2.64 times the radius of the planet itself. Use this information to find the mass of Saturn. Express your answer as a multiple of

34. Astronomy

Consider an asteroid of radius 2 km and density 2,500 kgm3 impacting the Earth. When it collides with the surface its kinetic energy is, to a large extent, dumped into the environment, some as heat vaporizing rock and some as mechanical energy throwing

35. Astronomy

Suppose the Moon is at a (center-to-center) distance D from Earth. Find an exact expression for the magnitude of the tidal force applied by Earth to our rock of mass m in terms of D, m, the mass of Earth Me (input as M_e), and the lunar radius Rm (input as

36. Math

Evaluate the following expression. (Note, I'm not sure how to write this in mathematical form)but the P is slightly raised above both numbers. 210 P 1 = ______

37. Urgent Math

f(x)=(x+2)^3-4. The point (-2, -4) is which of the following? A) An absolute maximum B) An absolute minimum C) A critical point but not an extremum. D) Not a critical point E) None of these I think the answer is C, am I right?

38. English

Hello. I will really appreciate some help. 1)Is it correct to use -ing form in the sentence: "The aim of the group is creating a new strategy" or is it "the creation" or only "to create"? 2)Do you think it's OK to use the word "target" instead of "aim" in

39. Math

Find the standard divisor for the given population and number of representative seats. Assume the population is equal to 190,000 and the number of seats is 8. d = ______

40. Math

Suppose the modified quota is 7.47. Fill in the blanks, and round your answers to two decimal places. (a) Find the lower quota. (b) Find the upper quota. (c) Find the arithmetic mean of the lower and upper quotas. (d) Find the geometric mean of the lower

41. Calculus

Use the graph of f(x)=x^2/(x^2-4) to determine on which of the following intervals Rolle's Theorem applies. A) [0, 3] B) [-3, 3] C) [-3/2, 3/2] D) [-2, 2] E) None of these

42. Algebra

Suppose the modified quota is 2.77. Fill in the blanks, and round your answers to two decimal places. (a) Find the lower quota. (b) Find the upper quota. (c) Find the arithmetic mean of the lower and upper quotas. (d) Find the geometric mean of the lower

43. Physics

A(n) 15 g bullet is ﬁred into a(n) 116 g block of wood at rest on a horizontal surface and stays inside. After impact, the block slides 15 m before coming to rest. The acceleration of gravity is 9.8 m/s 2 . If the coeﬃcient of friction between the

44. statistics

a. Compute the mean, median, and mode. b. Compute the variance, standard deviation, range, coefficient of variation, and Z scores. Are there any outliers? Explain. c. Are the data skewed? If so, how? d. Based on the results of (a) through (c), what

45. Math

Suppose the modified quota is 7.47. Fill in the blanks, and round your answers to two decimal places. (a) Find the lower quota. (b) Find the upper quota. (c) Find the arithmetic mean of the lower and upper quotas. (d) Find the geometric mean of the lower

46. Math

3sqrt(23) * 7sqrt(10) * sqrt(45)

47. maths --plse help me..

if the no. of bacteria doubles everyday and on the 16th day , a jug becomes full . then on which day was it half filled?

48. Science

A student weighs 36.4kg suppose his entire body is made of electrons. How many electrons are present in his body. What would be charge in his body.

49. Astronomy

Darwin proposed that the Moon formed far closer to Earth than it is now. Let’s see just how close it could possibly be to Earth and survive. In particular, in the next 4 problems you will find the distance from Earth at which the tidal force due to Earth

50. math

Suppose an insurance agent offers you a policy that will provide you with a yearly income of \$190,000 in 30 years. What is the comparable annual salary today, assuming an inflation rate of 3%?. (Round your answer to the nearest cent.)

51. music

What is the diameter of the head joint of the flute?

52. Math

Find the probability whose odds against are given in the problem. Odds against are 5 to 7. Answer is ________.

53. Math

Use the definition of logarithm to simplify each expression. (a) log6b (6b) (b) log9b ((9b)^5) (c) log10b ((10b)^-8)

54. math

47 lbs=kgs give answer in decimal form