# jill

Popular questions and responses by jill
1. ## chem

3.0 mol sample of KClO3 was decomposed according to the equation 2KClO3 = 2KCl + 3 O2 How many moles of O2 are formed assuming 100% yield? is it 3 moles? I don't want to work through the details of this problem completely. Tell me what you don't understand

2. ## Chemistry

A technician mixes a solution containing silver nitrate with a solution containing sodium chromate. 2.89 g of precipitate is produced (assume silver chromate). Calculate the mass of silver nitrate present in the first solution. Make sure you have the

3. ## statistics

A large number of applicants for admission to graduate study in business are given an aptitude test with a resulting mean score of 460 with a standard deviation of 80. The top 2.5 percent of the applicants would have a score of at what? A. 606 B. 617 C.

4. ## Physics

Consider a coin which is tossed straight up into the air. After it is released it moves upward, reaches its highest point and falls back down again. Air resistance can be neglected. What force acts upon the coin while it moves upward after it is released?

5. ## Physics

The portion of string between the bridge and upper end of the fingerboard (the part of the string that is free to vibrate) of a certain musical instrument is 60.0 cm long [.6m] and has a mass of 2.23 g [.00223kg]. The string sounds an A4 note (440 Hz) when

6. ## Statistics

The Graduate Record Examination (GRE) has a combined verbal and quantitative mean of 1000 and a standard deviation of 200. Scores range from 200 to 1600 and are approximately normally distributed. For each of the following problems: 1. Draw a rough sketch,

7. ## math

What is the height of a triangle whose base is 9.4 centimeters and whose area is 132.54 square centimeters?

8. ## Microeconomics

Correcting for negative externalities - Regulation versus tradablepermits Suppose the government wants to reduce the total pollution emitted by three local firms. Currently, each firm is creating 4 units of pollution in the area, for a total of 12

Which of the following are trigonometric identities? (Can be more then one answer) tanx cosx cscx = 1 secx-cosx/secs=sin^2x 1-tanxtany=cos(x+y)/cosxcosy 4cosx sinx = 2cosx + 1 - 2sinx Find all solutions to the equation cosx cos(3x) - sinx sin(3x) = 0 on

10. ## math

Find the product of (2a + 3b)(2a − 3b). A. 4a2 − 6b2 B. 2a2 − 3b2 C. 4a2 + 12ab − 9b2 D. 4a2 − 9b2 plz help

11. ## physics

A book of mass 7 kg rests on a plank. You tilt one end of the plank and slowly increase the angle of the tilt. The coefficient of static friction between the book and the plank is 0.40. What is the maximum angle of tilt for which the book will remain

12. ## geometry

A 24 foot ladder forms a 76 degree angle with the ground. The top of the ladder rests against the building. To the nearest inch how high up the building does the ladder reach?

13. ## geometry

the area of a triangle is 27 square feet. its height is three times the length of its base. find the height and base of the triangle. i am unsure of how to set it up, please help

14. ## chemistry

Barium carbonate and nitric acid: BaCO3 (s) + 2HNO3 (aq.) --> Ba2+ (aq.) + 2(NO3-) (aq.) + CO2 (g) + H2O (l) If 25.0mLs of 0.150M nitric acid was used, how many grams of barium carbonate would be required for complete reaction?

15. ## Physics

The intensity of sunlight reaching the earth is 1360 W/m^2 Part A: Assuming all the sunlight is absorbed, what is the radiation-pressure force on the earth? Give your answer in newtons. Part B: Give your answer as a percentage of the sun's gravitational

16. ## precal

Find f(x) and g(x) such that h(x)=(fog)(x) h(x)=x^2-9 / x^2+9

17. ## geometry

Constructing Perpendicular Lines same as last time, i need an exact example of these instructions, if someone could share it with me, it would be greatly appreciated Draw a line and a point on the line. Label the point K. With the point end of the compass

18. ## Algebra

Points A(3,5) and B(7,10) are the endpoints of a diameter of a circle graphed in a coordinate plane. How many square units are in the area of the circle? Express your answer in terms of pi.

19. ## physics

A flatbed truck is supported by its four drive wheels, and is moving with an acceleration of 7.4 m/s2. For what value of the coefficient of static friction between the truck bed and a cabinet will the cabinet slip along the bed surface?

20. ## trigonometry

graph y=-3sec(2x-pi/3)proved the period vertical translation and the phase shift

21. ## Chemistry

Assuming that temperature remains constant, calculate the final volume Pressure of a sample of 45 L of gas is increased and the gas goes from 100 kPa to 125 kPa;

22. ## physics

on the surface of earth, a spacecraft has a mass of 2.00x10^4 kilograms. What is the mass of the spacecraft at a distance of one earth radius above earths surface?

23. ## literary

Hi, I don't seem to understand Stephen King's "Why we crave horror movies" Give three examples of figurative language (in this case, a metapor) King uses. For each, explain what two things are being compared and state why you think this is an effective

24. ## Math

Two dice are rolled. Find the odds that the score on the dice is either 7 or 12

25. ## statistics

10th grade New York public school students taking a standardized English test produced test scores that were normally distributed with a mean of 85 and a standard deviation of 4. Let x be a random variable that represents the test score of a student.

26. ## Math

When two-fifths of a number is increased by 15 the result is 27. What is the number?

27. ## Chemistry

Explain clearly which out of the following combinations of solutes would result in the formation of a buffer solution? A) NH3 and HCl in a 2:1 molar ratio B) HCl and NaOH in a 1:2 molar ratio C) NH3 and NH4Cl in a 2:1 molar ratio D) NaOH and CH3COOH in a

79. ## math

Suppose h(x)=1/\sqrt x for x>0. Does h have an inverse? If so, find h^-1(4).

80. ## algebra

Suppose g(x)=4x^2+8x+13. Does g have an inverse? If so, find g^{-1}(25)

88. ## algebra

A video store charges a monthly fee of 7.50, but the charge to rent each movie is only 1.00 per movie. Another store has no membership fee, but it costs 2.50 to rent each movie. How many movies need to be rented each month for the total fees to be the same

89. ## Solve the polynomial inequality

Solve the polynomial inequality and graph the solution set on a real number line. Express the solution set in interval notation. x^3+x^2+4x+4

90. ## physics

A sled is accelerating down a hill at a rate of 1 m/s2 . If the mass of the sled is suddenly cut in half and the net force on the sled is doubled, what is the acceleration of the sled?

91. ## Statistics

If you roll a fair die 100 times and 35 of the rolls result in a six, what would be the probability of the outcome of a 2, P(2)? P(2) = 0.02 P(2) = 2 P(2) = 35 P(2) = 0.35

92. ## Statistics

Suppose the correlation between two variables is -0.57. If each of the y-values is multiplied by -1, which of the following is true about the new scatterplot? It slopes up to the right, and the correlation is -0.57 It slopes up to the right, and the

93. ## physics

When a parachute opens, the air exerts a large drag force on it. This upward force is initially greater than the weight of the sky diver and, thus, slows him down. Suppose the weight of the sky diver is 950 N and the drag force has a magnitude of 1100 N.

94. ## finance

You buy an 8% annual coupon bond from CARRIS Inc. that has a 25 year maturity and a required return of 12%. The par value is \$1,000. You sell the bond five years later when the required return is 10%. What is the beginning price of the bond when it is

95. ## Quantitative Chemical Analysis

assume an unknown sample to be 15% copper, weigh enough dried ore sample to use approximatele 35-45mL of .09M S2O3-. How many grams do I need to measure out to use 40.00mL of the thiosulfate solution?

96. ## Geometry

Similar ratio and ratio perimeter for two regular octagons with area=18in squared and 50in squared. 9:25, 3:5 or 9:25, 9:25

97. ## math

two billion,six hundred million in expanded notation using powers of 10 (2x 10^11) + (6x10^8) would that be correct??

What is a vital process performed by proteins embedded in cell membranes?