1. precalculus

Outside temperature over a day can be modelled as a sinusoidal function. Suppose you know the temperature is 80 degrees at midnight and the high and low temperature during the day are 90 and 70 degrees, respectively. Assuming t is the number of hours since

2. Scatter plots

Which of the following types of information is NOT suited for display on a scatter plot? 1. relationship between age and number of books read in a year 2. relationship between height and shoe size 3. relationship between calories consumed and body weight

3. Chemistry 140A

A gas cylinder containing 6.38 mol of neon has a pressure of 491 mm Hg at 295 K. If 3.22 mol of helium is added to this cylinder, at constant temperature and volume, what will be the pressure in the cylinder?

1. Given the altitude of lakes in feet: –12, –9, –14, –39, –49, –49, –18, –43, find the mean, median, mode, and range. (1 point) mean = –28.5, median = –29.1, mode = –49, range = 40 mean = –29.1, median = –49, mode = –28.5,

5. Physics

A test rocket is launched vertically from ground level (y=0m), at time t=0.0 s. The rocket engine provides constant upward acceleration during the burn phase. At the instant of engine burnout, the rocket has risen to 97 m and acquired a velocity of 40 m/s.

6. physics

Jesse travels 3.0 meters east and then turns and travels 4.0 meters north. The trip requires 35 seconds. What is his velocity?

7. Soc. Studies-Ms. Sue

What was the first territory to shed blood in a civil war over slavery? A.Texas B.Kansas C.Missouri D.South Carolina I know there was blood shed in Kansas-but there is info that South Carolina was the first territory that had blood shed??? Can you help me?

8. statistics

The National AIDS Behavioral Surveys interviewed a sample of adults in the cities where AIDS is most common. This sample included 782 heterosexuals who reported having more than one sexual partner in the past year. We can consider this an SRS of size 782

9. statistics

About 24% of all homes purchased on 2004 were considered investment properties. a random sample of 800 homes sold in 2004 is obtained. What is the probability that at most 200 homes are used as an investment property?

64. algebra 1

the population of a city can be modeled using the equation p=40,000x(9/10)^x. one year the population was 23620. what was the following population a year later.

65. Biochemistry

Volume of reaction flask is 2ml. There are 273 nanomoles of molecular oxygen (O2)/ml of reaction volume at 25*C. What is the amount of atomic oxygen (nanomoles) in the reaction flask?

66. math

TOM bought a rectangular piece of land that was 3 miles long and 2 miles wide .Half of the land could be farmed .How many square miles could not be farmed?

67. Science

7. Which of the following changes gives no evidence that a chemical reaction has taken place? A cube of solid forms a puddle of liquid. A certain liquid is added to a solid, and bubbles of gas form. Two liquids are mixed, and a precipitate forms. Heating a

68. Geometry

When you use the distance formula, you are building a _____ triangle whose hypotenuse goes between two given points. A.right B.equilateral C.acute D.None of these

69. Math

How would you go about making 250ml of a 20X stock solution of NaCl to dilute later to a final concentration of 50mM? I know that the molecular weight of NaCl is 58.44 but I am not sure where to start. I need to figure out the amount of NaCl and water

109. chemistry

i am going crazy trying to figure this out. i just completed an experiment with heats of fusion and vaporization but for some reason i cant answer and explain this question would 20.0g of steam at 100 degree celsius be enough to melt 20.0g of ice at 0

Need help to explain to my daughter: A horsepower is the power needed to lift 33,000 pounds 1 foot in 1 minute. It is equivalent to 746 watts. Express 525 watts as a portion of a horsepower both as a fraction and a decimal rounded to the nearest

111. English

1. Research skills are fundamental to: A. academic writing. B. all types of writing. C. education, literature, business, and other industries. D. libraries. is it B

112. math trigonometry

There is a small circle and a big circle. A small circle has a radius of 1.5. What is the area of the big circle?

113. algebra

is 5x + 2y = 8 look like horizontal, vertical, slanted right upwards,slanted right downwards?

114. Soc. Studies

How did the 1860 election contribute to the breakup of the Union? A.by electing a president many believed would not protect Southern rights B.by electing a pro-slavery president whom the North would not tolerate C.by allowing freed slaves to vote D.by

115. Collage Physics

An elevator with a man inside, of gross mass 500KG, starts moving upwards with a costant acceleration and acquires a velocity os 2m/s after travelling a distance os 3m.Find the pull in the cables during the accelerated motion. If the elevator, before

116. social studies

Were there any key events in Millard Fillmore's life that shaped their dream for the United States?

117. Math

Calculate the morality of a solution made by mixing 250ml of 0.75M H2SO4 with 400ml of 2.5MH2SO4

118. science

at a construction site a crane lifts a block of mass,m,vertically upwards through a height of 70 m at constant speed by means of a strong cable.The block experiences a force of magnitude 8 N as a result of air friction as it is lifted vertically upwards.

119. Algebra

a and b are digits such that \overline{120ab} is a multiple of 3, 5 and 7. What is the value of \overline{ab} ?

120. grammar

I [ran] around the track four times at the previous football game. OR I [have run] around the track four times at the previous football game?

122. Math

log(x-2) +log8 (x-4) =log6 (x-1)

123. Form a polynomial f(x)

Form a polynomial f(x) with the real coefficients having the given degree and zeros. Degree 5; Zeros: -3; -i; -6+i f(x)=a( )

124. chemistry

How many grams of ZnCl2 will be produced from 48 grams of zinc and 30 grams of HCL

125. Use the intermediate value

Use the intermediate value theorem to show that the polynomial function has a zero in the given interval. f(x)=4x^3+6x^2-7x+1; [-4,-2] f(-4)=

126. Statistics

Use this information to calculate the mean and standard deviation of this random variable. P(x)- .25, .05, .55, .15

127. College Algebra! help!

Form a polynomial f(x) with the real coefficients having the given degree and zeros. Degree 5; Zeros: -4; -i; -2+i f(x)=a( )

128. chemistry

i am going crazy trying to figure this out. i just completed an experiment with heats of fusion and vaporization but for some reason i cant answer and explain this question would 20.0g of steam at 100 degree celsius be enough to melt 20.0g of ice at 0

please help with this problem Your dad is taking Biology as part of the veterinarian program at the local community college. This semester he will spend a total of 40 hours in the biology lab, and he will take notes in class 6 hours per week. Define a

130. History 203

What is the purpose of studying American history? What do we gain from doing so?

131. Statistics

A pharmaceutical company claims its new medication relieves painful symptoms caused by tension headaches within 15 minutes. To investigate this claim, a local health clinic conducts a study of 45 patients who suffer from chronic tension headaches. Each

217. math

and what would 0.1875 be as a fraction?

218. Find the complex zeros

Find the complex zeros of the polynomial function. Write f in the factored form. f(x)=x^3-3x^2+7x-5 f(x)=

232. math

-(-2)^0*(-2)^3*(-2)^-4/(-2)^3

233. multivariable calculus

Consider the surface given by the equation: 2x2 - 3z2 - 4x -4y - 12z + 2 = 0 (a) Write in standard form ) (b) Determine and classify the traces with planes parallel to the xy-, xz- and yz- planes. (c) Hence classify the surface.

237. Life orientation

Discribe the life style of cancer and explain 5(more) factors that contribute to the cancer

238. physics

How to calculate the series AC coupling capacitance? Is there an equation for this? Thank you for any help

239. maths

An iron rod when cut into pieces each of 30 cm length, a piece of 7 cm is left out. However, if each piece is of 28 cm length, a piece of 5 cm is left out. What is the length of the shortest such rod?

240. Algebra

As x ranges over all real values, what is the minimum value of f(x)=|x-123|+|x-456| + |x-789|

241. English

"The song of Wandering Aengus" is a (n) ________poem. A: epic B: allegorical C: dramatic D: prose Answer : C ?

242. Calculus

What is the connection between improper integrals, Riemann sums, and the integral test?

243. English

For the speaker in "Local Sensibilities,"pineapples represent: A: His favorite food. B: A Thanksgiveing ham. C: tourists D: work. Answer: B ?

244. math

find the area of a table top with 7/8 of a foot length and 3/5 of a foot wide.

245. English

The tone of "A smile" is ? A: Hopeful B: Cheerful. C: tense D: light Answer : D In "Boast Not , Proud English," the writer is protesting against: A: Prejudice B: Blasphemy C: Religion D: tolerance Answer: C ? In "Birches," Frost compares the broken ice

246. Physics

A 5.50-kg ball, moving to the right at a velocity of +2.35 m/s on a frictionless table, collides head-on with a stationary 7.60-kg ball. Find the final velocities of the balls if the collision meet the following conditions. (a) elastic 5.5-kg ball =

247. Science

When hot magma rises toward the crust the process is called what

248. Algebra

Consider all 2 digit numbers N such that the last 2 digits of N^2 are N itself. What is the sum of all these 2 digit numbers?

249. math

solve the polynomial inequality and graph the solution set on a real number line. set in interval notation. x^3+2x^2-4x-8>0 I have been staring at this problem for the last 15 minutes because I just don't understand it, somebody please help me?

250. algebra 1

which equation models an exponential decay y=1/4x500^x 1/3y=6x100^x y=0.5x8^x y=23x(1/2)^x y=0.004x2^x i think it is d

251. Geometry

Two points are chosen uniformly at random on the unit circle and joined to make a chord C_1. This process is repeated 3 more times to get chords C_2, C_3, C_4. The probability that no pair of chords intersect can be expressed as \frac{a}{b} where a and b

252. Pre-calculus

Convert from DMS to Radians 1)61degree 24' 2) 75degree 30' Convert from Radians to Degrees 1) 2 2) 1.3 Please Help me, just tell me how to solve them and do it in the calculator.

253. Geometry

Two points are chosen uniformly at random on the unit circle and joined to make a chord C_1. This process is repeated 3 more times to get chords C_2, C_3, C_4. The probability that no pair of chords intersect can be expressed as \frac{a}{b} where a and b

254. Math

6 quarters, 4 dimes, 3 nickels, 10 pennies. what is the probability you will get at least one of each coin in change of 1 dollar

255. Geometry

ABC is an isosceles triangle where AB = AC and BC = 60. D is a point on BC such that the perpendicular distance from D to AB and AC is 16 and 32, respectively. What is the length of AB?

256. calculus 1

differentiate x(x-3)^2 do I product and chain rule?

257. science

should'nt i use the equation mgh+half mv^2before=mgh+half mv^2aftr?

258. science

should'nt i use the equation mgh+half mv^2before=mgh+half mv^2aftr?.

259. Algebra

Given f(x) = (x-1)(x-2) + (x-2)(x-5) + (x - 3)(x-8), what are the sum of the roots of f(x)?