1. statistics

A researcher at a major hospital wishes to estimate the proportion of the adult population of the U.S. that has high blood pressure. How large a sample is needed in order to be 99% confident that the sample proportion will not differ from the tgrue

2. Physics

A block of mass m is placed in a smooth-bored spring gun at the bottom of the incline so that it compresses the spring by an amount x_c. The spring has spring constant k. The incline makes an angle theta with the horizontal and the coefficient of kinetic

3. chemistry

addition of a strong acid would increase the solubility of which of the following salts AgCl CaSO4 CdS CaCO3 PbBr2 CaHPO4 Cd(OH)2 AuCl

4. physics

4. What is the electric potential at the surface of a gold atom’s nucleus, which is assumed to be spherical? The radius of a gold nucleus is 6.6 x 10-15 meters and the atomic number of gold is 79.

5. science

how many half-lives have passed if 87.5% of a substance has decomposed? how many if 99.999% has decomposed?

6. Physics

In a "worst-case" design scenario, a 2000-{\rm kg} elevator with broken cables is falling at 4.00 {\rm m/s} when it first contacts a cushioning spring at the bottom of the shaft. The spring is supposed to stop the elevator, compressing 2.00 {\rm m} as it

7. physics

A car travels between the 100 meter and 250 meter highway markers in 10 second. The average speed of the car during this interval is...

8. Statistics

Assume that male and female births are equally likely and that the birth of any child does not affect the probability of the gender of any other children. Find the probability of exactly eight in ten births.

9. chemistry

If the solubility of NaCl at 25 degrees Celsius is 36.2 g/100 g H2O, what mass of NaCl can be dissolved in 200.0 g of H2O?

I have a question about the short story "Son" by John Updike. I have research this and read it but find it very confusing-I have two answers totally eliminated and would just like some input-Thank you so much Is "Son told in a.order from the contemporary

11. physics

1. How far apart must two protons be if the electrical force of repulsion acting on either one is equal to its weight?

12. Chemistry

Approximately how much water should be added to 10.0 mL of 12.0 M HCl so that it has the same pH as .90 M acetic acid(Ka= 1.8 x 10^-5)?

13. Chemistry

At 20 C (approximately room temperature) the average velocity of N2 molecules in air is 1050 mph. What is the velocity of a molecule of N2? What is the kinetic energy of a N2 molecule with this velocity? What is the kinetic energy of a mole of N2? I know

14. chemistry

how many grams of lithium sulfate will be formed when 25 grams of sulfuric acid react with an excess of lithium hydroxide in the following reaction

15. chemistry

Calculate the standared enthalpy of formation of solid Mg(OH)2 given the following data: 2Mg(s) + O29(g) →2MgO(s) ∆H = -1203.6kJ Mg(OH)2(s) →MgO(s) + H2O(l) ∆H= +37.1kJ 2H2(g) +O2(g) →2H2O(l) ∆H = -571.7kJ

A paper cup has the shape of a cone with height 8cm and radius 3cm at the top. Water is being poured into the cup at the rate of 2cm3/s. How fast is the water level rising when the water is 6cm deep?

17. Science

Which are the keystone species from the chaparral biome

A 1.94 kg solid sphere (radius = 0.105 m) is released from rest at the top of a ramp and allowed to roll without slipping. The ramp is 0.710 m high and 5.17 m long. When the sphere reaches the bottom of the ramp, what is its total kinetic energy?

19. Math

The circular rug is placed on a square floor. The rug touches all four walls. How much of the floor space is not covered by the rug? The square floor is 14 feet for length and width.

20. Math

1st grade math worksheet says Write some names for 12, what does this mean?

108. Chem

a) An ethylene glycol solution contains 21.1 g of ethylene glycol in 86.0 ml of water. compute the freezing point of the solution. b) Compute the boiling point of the solution.

109. Physics

Derive an expression for the gain Vout/Vin. Express your answer in the form of A+jB. A basic non inverting operational amplifier with a capacitor connected in series with the resistor at the bottom.

110. Alg 1

Graph -4x+y>-6 5y

111. Calculus

A boat is pulled into a dock by a rope attached to the bow of the boat an passing through the pulley on the deck that is 1m high than the bow of the boat ,if the rope is pulled im at the rate of 0.8m/s how fast does the boat approach the deck when it is

112. Calculus (double check )

Find the centroid of the area bonded by the parabola y =4-x^2 and the x-axis? A.(0,1.6)

113. economics

Eric borrowed 515 dollars today and has agreed to pay back in equal monthly installments over 6 years. The bank charges Eric 4.94% per year, compounded monthly. What is the amount that Eric will owe the bank at the end of month 20 (that is, after the 20-th

114. English - Native speakers

Hello! Why don't we say possessive pronouns in English for the following words: my, your, his, her, its, our, your, their. Why do we say possessive adjectives? It doesn't make sense to me since my mother tongue is not English. Can you maybe explain this to

115. yes

Using your current work organization (or an organization of interest) as the subject matter, research the elements of business and prepare an APA formatted paper that:

116. Physics

Three resistors (14.4 Ω, 21.7 Ω, 14.1 Ω) are connected in parallel across 98 V. What is the total resistance for this circuit? What is the voltage drop across the 21.7 Ω resistor? What current is flowing in the 14.1 Ω resistor? What is the total

117. Physics

What current would flow in an ordinary 115 V household circuit, if a 1430 W hair drier and a 1000 W microwave oven were operating simultaneously on this line?How much current would the hair drier and microwave from the previous question draw, if they were

118. political science

Please help Thank you Examining and criticizing the policies and proposals of the majority party is a function of ? The majority party Foreign governments The minority party Government bureaucrats The judicial branch The power an interest group exerts is

119. econ

A bumper crop of farm products causes: 1) only a slight decline in the price of farm products because the demand for farm products is income inelastic. 2) a large decline in the price of farm products because the demand for farm products is price

120. English

1. Wilma was able to walk again at age twelve. 2. Wilma was able to walk again at the age of twelve. 3. Wilma was able to walk again at twelve. 4. Wilma was able to walk again aged twelve. (Which ones are correct? Could we use other expressions?)

121. psychology

during the what phase of a problem solving, means-ends analysis is a very common heuristc.

122. psychology

in an instance of what recovery a conditioned response that has be extinguished reappears when a person is exposed to a related stimulus

123. physics

Suppose you notice 6.3 ocean waves pass by a buoy in 26.3 seconds. What is the frequency of the ocean waves?

124. geometry

The diagonals of a rhombus are in 2:1. If the perimeter of the rhombus is 120cm, find the length of the diagonals.

125. math

what is the length of side AB in triangle ABC with AB=AC, BC=8, and median CD=9

126. marketing

Name 3 things a marketing department of a firm does?

127. Etymology

I am doing a project on Fascinating Etymology Stories and was wondering if you guys know of any good websites with interesting stories of the origin of words, preferrably not words that came from a persons name. Thanks:)

128. English

Can you please check if everything is correct now? I made the chages you told me. I have one more doubt in n. 3: Can I used "bored with" instead of bored by? 1)She was really upset about her uncle’s death. 2)She was embarrassed about the way her father

129. Economics

a. If the face value of a coin exceeds the cost of coinage, the resulting revenue to the issuer of the coin is known as

130. English

Can you check these sentences for me, please? I really need to know if they are possible because I need to meet some American teachers tomorrow. 1)How do you call the teacher who is at the head of the English Department in a high school? 2) She has

131. stats

if the true proportion of californians who are unemployed is 11%, what is the probability that a sample of 100 californians are unemployed?

132. Law - understanding terms

I have this worksheet which asks me "historical barriers to achieving equality right" and the other coloumn asks "contemporary barriers to achieving equality rights" What is the difference between them.. is it the historical one is the history in the late

133. science

How do you calculate the atomic mass of magnesium? 79% magnesium-24, 10% magnesium-25, 11% magnesium-26

134. Multiplying and Dividing Rational Expressions

solve 81x9/y4* x2/36x5y

135. Chemistry

Calculate the pH of a 25 mL distilled water sample after the addition of 2 mL of HCl Calculate the pH of a 25 mL distilled water sample after the addition of 2 mL of NaOH

136. science

What is the density of coconut oil?

137. English

I realized I left out a paragraph for you to check. Thank you. In particular, can you say a bike shop, enthusiastic about? 1) Johnny has got a headache and he can’t train. Storm is training for the triathlon alone. 2) Her times are fast but she finds

138. Social

Is government regulation necessary in all aspects of business, why or why not? Are there some policies which make more sense than others? - I know that government regulation isn't always necessary to run a business and some people are capable are able to

139. math

How many ways can we select a group of 4 people from a class of 27? Please explain

6.4/84

30 - 19 1/3

142. math

To purchase your first home, you may be required to borrow funds from a bank. You have just graduated from college, and your dream is to own your first home. Before you begin looking for your dream home, you need to learn more about funding options and the

INTRODUCTION Imagine yourself seven years from now. You are approximately 22 years old, and are looking to start a career after you have taken the previous four years for post-secondary education, travel, and some work. You are moving out of your parents

144. math

What are the first and third quartiles of the box and whisker plot above? 0 15 110 225

145. chemistry

what effect would each of the errors decribed below have on the concentration of potassium hydrogen phthalate... 1) so of the solids potassium hydrogen phthalate will spilled when transfering into the beaker... 2) not enough water was added to bring the

146. finance

If you expect the inflation premium to be 2%, the default risk premium to be 1%, and the real interest rate to be 4%, then what interest rate would you expect to observe in the marketplace on short-Term Treasury Securities?

147. math

Kate drove from Amesville to Barstow at an average speed of 60 km per hour. Tyler drove the same route at an average speed of 80 km per hour. 1. If the distance from Amesville to Barstow is 40 km, how much less time did it take Tyler to make this trip than

148. math

Ben can complete 3 math problems in 21 minutes. If he continues working at the same rate, how long will it take Ben to complete 16 math problems? thanks .

149. Geometry

If the diagonal of a square has a length of 10 suare root of 2 cm, find the area of the square and the perimeter of the square.

150. math

You have just received advertisements from 2 companies in your area: Greener Lawns and Lawns for Less. Greener Lawns charges an initial fee of $200, plus$50 per hour for labor costs. Lawns for Less charge an initial fee of $300, plus$25 per hour for

151. math

system of equations can result in 3 possibilities: consistent, inconsistent, and dependent. Discuss each of these types of solution that can be generated, and describe the graph of each possibility.

152. Math

One summer, Jared earned $26 each time he mowed the lawn. He mowed the lawn a total of 13 times that summer. He had to fix his lawn mower one time during the summer, which cost him$32.42. Which number sentence could be used to find M, Jared's profit for

181. English

Can you please tell me if the tense choice is correct in this paragraph? Tahnk you. Two verbs in brackets. 1) Time is personified through the use of a capital letter in line 9, through the use of verbs referring to human action (line 10: beding, come) and

182. precalc

How do I calculate the number of images in a particular iteration for a transformation?

183. Math

The combinated permeter of a circle and a squar is 16 find the dimensions of the circle and the square that produces a minimum total area?

184. Further maths

Under differential calculus using the product rule find the derivative of (2x+3)^3(4x^2-1)^2

185. math

what is the nearest tenth of a centim eter in 4 inches

186. Math

I have more than 9 but less than 16 marbles. There are half as many red as blue. There are two more green than blue. There is an odd number of yellow. What do I have

187. Algebra2

Operations with fractions...3/5+4/5

188. etymology

how did wrigley come up the orbit. not the actually product but i need to know the orgin of the product name orbit. thanks:)

189. Math

Solve for x: -2x + 12 ≥ 18

210. English

Two very last doubts. Do you say "the Augustan or The Augustans were interested in real life". He admitted it had been him who ate all the cake./He admitted eating all the cake. Are they both correct?

6/5 / 1/5

212. Algebra

(7+2t),(49-4t^2),(7-2t) find the LCM

213. Science

Explain why the vacuum ball does not separate.

214. math

convert to a mixed number 20/9

215. stats

What are the steps to solve P(x>k)=.025 when the mean is 500, standard deviation is 100

216. math

6.8 in fraction notation

217. English

I forgot to include the other sonnet (N. 116). I find it hard to rephrase the last couplet. 1)Sonnets 116 is about love in its most ideal form. True love is to be based on mutual trust and understanding. 2) True love doesn’t change when the situation

218. Economics - anyone have any thoughts on this?

A)Who has more monopoly power---Wal-Mart or the concessionaire who has acquired the franchise to sell beer, hot dogs, colas, candy, etc., at a Washington Redskins football game? Explain. B)Who has more monopsony power---Wal-Mart or teams in the National

219. AP Spanish

Compare and contrast The Rising by Bruce Springsteen and Thursday from La Oreja de VanGogh.? I know the songs are about the September 11 tragedy in the U.S and the March 11 tragedy in Spain. Include comments and views of the role of each song.

A 12.1 g CD with a radius of 6.16 cm rotates with an angular speed of 31.1 rad/s. What is its kinetic energy?

221. MacroEconomics

Testing procedures required by the US Food and Drug Administration raise the cost and price of drugs. Should we eliminate such requirements in order to ease inflationary pressures?

222. math

Find the values of c so that the intersection of y=-x+6 and y=x/3+c lies strictly in the first quadrant (not on a coordinate axis).

14/51 * 3/4

224. Marketing

Clustering techniques applied to segmenting markets?

225. history

do the usa and china leaders cooperate to solve problems such as finance, trade,tyrants, and/or military actions?

226. pre calc

Find the critical number of the function. g(t) = | 6t - 9 | t =

227. tina

40-2q+.03q^2=40-q-.01q^2 .04q=1 q=25 this is what i keep getting but I am suppose to be getting 50 what am I doing wrong?