# Danielle

Most popular questions and responses by Danielle-
## Math-

A ball is thrown vertically upward with an initial velocity of 96 feet per second. The distance s (in feet) of the ball from the ground after t seconds is s(t)=96t-16t^2 a.) at what time will the ball strike the ground b.) for what time t is the ball more

*asked on March 25, 2012* -
## math

Tyler is thinking of a number that is divisible by 2 and 3. By which of the following numbers must Tyler's number also be divisible? 6? 8? 9? 12?

*asked on January 6, 2015* -
## math

Manny makes dinner using 1 box of pasta and 1 jar of sauce. If pasta is sold in pckages of 6 boxes and sauce is sold in packages of 3 jars, what is the least number of dinners that Manny can make without any supplies left over?

*asked on December 9, 2014* -
## pre calculus

A taxi company charges $2.00 for the first mile (or part of a mile) and 20 cents for each succeeding tenth of a mile (or part). Express the cost C (in dollars) of a ride as a piecewise-defined function of the distance x traveled (in miles) for 0

*asked on March 27, 2014* -
## Chemistry

How many isomers does bromoethane (C2H5Br)??

*asked on April 14, 2011* -
## Algebra

1. What are the next two terms of the following sequence? 1, 5, 9... A. 27, 211 B. 10,11 C.12,15 D.13,17 2. Which of the following are examples of arithmetic sequences? Choose all that apply. A. -2,2,6,10 B. 1,3,9,27 C. 5,10,20,40 D. 5,1,-3,-7 3. What is

*asked on November 19, 2015* -
## algebra graphing

according to some students, what is the true purpose of homework?

*asked on April 9, 2013* -
## chemistry 2

You are instructed to create 800. mL of a 0.69 M phosphate buffer with a pH of 7.6. You have phosphoric acid and the sodium salts NaH2PO4, Na2HPO4, and Na3PO4 available. what is the molarity needed for the acid component of the buffer?What is the molarity

*asked on March 4, 2014* -
## Geometry

Given: ABCD is a parallelogram;

*asked on June 13, 2007* -
## Physics

a plane travels 5.0x10^2 m while being accelerated uniformly from rest at the rate of 5.0m/s^2. What final velocity does it attain?

*asked on May 7, 2011* -
## English

Hi, I'm in need of some help with the poem "Marvell's garden" by Phyllis Web. I'm stuck on what the tone of the poem? and having trouble interpreting the first two stanzas.

*asked on February 1, 2008* -
## Algebra

1. What is the slope of the line that passes through the points (-2, 5) and (1, 4)? A. -3 B. -2 C. -1/3 D. 1/3 2. A line has a slope -5/3. Through which two points could this line pass? A. (12, 13) and (17, 10) B. (16, 15) and (13, 10) C. (0, 7) and (3,

*asked on November 29, 2015* -
## math

you deposit $200 in an account earning 3.5% simple interest. How long will it take for the balance of the account to $221?

*asked on May 25, 2016* -
## Physics

The tops of the towers of the Golden Gate Bridge, in San Francisco, are 227m above the water. Suppose a worker drops a wrench from the top of a tower. If the average force of air resistance is 22% of the force of free fall, with what speed will the wrench

*asked on November 6, 2011* -
## Chemistry

A 0.22-caliber handgun fires a 27-g bullet at a velocity of 765 m/s. Calculate the de Broglie wavelength of the bullet. Is the wave nature of matter significant for bullets?

*asked on March 28, 2012* -
## Precalculus

If c= 16 and B= 67 degrees, find a.

*asked on August 17, 2010* -
## Child Development

1) The recording method that's most useful in discovering the causes or results of a child's behavior is A. rating scale. ￼B. time sampling. C. event sampling. D. checklist. 2) One way a teacher can help a child stand up for her rights is A. making other

*asked on December 4, 2014* -
## college chemistry

The equilibrium constant for the reaction Sr(s) + Mg2+(aq) Sr2+(aq) +Mg(s) is 3.69 x 10^17 at 25 C. Calculate Ecell for a cell made up of Sr/Sr2+ and Mg/Mg2+ half cells.

*asked on April 12, 2017* -
## Chemistry

What is the O-C-N bond angle in OCN-? Why is the answer 180 degrees?

*asked on April 20, 2010* -
## ALGEBRA 1

If x and 3x-10 represent the measure of the acute angles of a right tringle find the value of x. THANKS Let's take it step by step. A triangle has 3 angles in it. Those three angles, when added together, is 180. In a right triangle, one of the angles is 90

*asked on February 12, 2007* -
## simple algebra

Re arrange this to isolate A H=K+log(A/C) Thank you

*asked on January 17, 2018* -
## Calc

The marginal cost of manufacturing x yards of a certain fabric is C′(x)=3−0.01x+0.000006x2 (in dollars per yard). Find the increase in cost if the production level is raised from 3500 to 8500 yards. Increase in cost =

*asked on April 28, 2015* -
## Chemistry hw

predict a likely mode of decay for each of the following unstable nuclides. Explain why. 1.) Mo-109 2.) Fr-202 3.) Rn-196 4.) Sb-132 5.) P-27 6.) Ru-90

*asked on April 25, 2012* -
## Geometry

I really need some help please!!!!! Am I on the right tract? Given: ABCD is a parallelogram;

*asked on June 18, 2007* -
## Physics

As a moon follows its orbit around a planet, the maximum gravitational force exerted on the moon by the planet exceeds the minimum gravitational force by 28.2 %. Find the ratio rmax/rmin, where rmax is the moon's maximum distance from the center of the

*asked on October 15, 2012* -
## Math

I have two questions that I need help with. 1. Angle of Depression: A Global Positioning System satellite orbits 12,500 miles above Earth's surface. Find the angle of depression from the satellite to the horizon. Assume the radius of Earth is 4000 miles.

*asked on March 25, 2008* -
## homework college chem.

a sample of gas occupies a volume at 73. 1 mL. As it expands, it does 135.0 J of work on its surroundings at a constant pressure of 783 torr. what is the final volume of gas?

*asked on February 26, 2012* -
## pre calculus

Jack invests $1000 at a certain annual interest rate, and he invests another $2000 at an annual rate that is one-half percent higher. If he receives a total of $190 interest in 1 year, at what rate is the $1000 invested?

*asked on March 4, 2014* -
## chemistry

The bromination of acetone is acid-catalyzed. CH3COCH3 + Br2 CH3COCH2Br + H+ + Br - The rate of disappearance of bromine was measured for several different concentrations of acetone, bromine, and H+ ions at a certain temperature. [CH3COCH3] [Br2] [H+] rate

*asked on February 1, 2010* -
## Chemistry

The chemical 5-amino-2,3-dihydro-1,4-phthalazinedione, better known as luminol, is used by forensic scientists in analyzing crime scenes for the presence of washed-away blood. Luminol is so sensitive that it can detect blood that has been diluted 10,000

*asked on February 11, 2009* -
## Calculus

A manufacture has been selling 1300 television sets a week at $420 each. A market survey indicates that for each $16 rebate offered to a buyer, the number of sets sold will increase by 160 per week. a) Find the price p(x) of each television as a function

*asked on March 25, 2015* -
## Physics

2. Saturn has a radius of about 9.0 earth radii, and a mass 95 times the Earth’s mass. Estimate the gravitational field on the surface of Saturn compared to that on the Earth. Show your work. Answer: g= GM/r² G= 6.67 * 10^-11 Nm²/kg² ME= 5.98 * 10^24

*asked on December 10, 2015* -
## Math

A speaker has a collection of 62 jokes. He uses 3 jokes in each speech. Please help i got a is 37820 but really need help with part b (a) In how many ways can he select 3 jokes for a speech? How many speeches can he give without using a joke twice? (Round

*asked on October 7, 2013* -
## Epidemiology

Which of the following six study design types most appropriately characterizes the studies described below (#1-6)? DESIGN TYPES a. Cross-sectional b. Case-control c. Prospective cohort d. Retrospective (historical) cohort e. Clinical trial f. Community

*asked on April 6, 2008* -
## chemistry

what is the general formula for a hydrate?

*asked on October 3, 2010* -
## Chemistry

If you dilute 14.0mL of the stock solution to a final volume of 0.350L , what will be the concentration of the diluted solution? Before it, there was a question: How many milliliters of a stock solution of 5.60 M HNO3 would you have to use to prepare

*asked on September 27, 2014* -
## statistics

In the following problem, check that it is appropriate to use the normal approximation to the binomial. Then use the normal distribution to estimate the requested probabilities. More than a decade ago, high levels of lead in the blood put 89% of children

*asked on November 14, 2013* -
## math

The outside diameter of a pipe is 5 and 7/32 inches. The walls of the pipe are 5/32 inches thick. find the inside diameter

*asked on March 12, 2015* -
## chemistry

Identify the ions present in KClO4. The answer is K+ and ClO4- how do you know this?

*asked on September 8, 2010* -
## Calculus

A model for the food-price index (the price of a representative "basket" of foods) between 1984 and 1994 is given by the function I(t)=0.00009045t5+0.001438t4−0.06561t3+0.4598t2−.6270t+99.33 Where t is measured in years since midyear 1984, so

*asked on March 25, 2015* -
## Chemistry!

An excited hydrogen atom emits light with a frequency of 1.141x10^14 Hz to reach the energy level for which n=4. In what principle quantum level did the electron begin?

*asked on March 28, 2012* -
## food economics

what are the 3 other names by which animal proteins are called?

*asked on April 26, 2011* -
## Math

I need help with this questions. a). An overhead garage door has two springs, one on each side of the door. A force of 15 pounds is required to stretch each spring 1 foot. Because of a pulley system, the springs stretch only one-half the distance the door

*asked on April 1, 2008* -
## college algebra

Suppose that the Russian population is declining by 0.48% each year, and continues to decline at this rate every year. a.) what is the overall 'growth' factor (really a decline factor) for 40 years of population decline? As a percentage of the current

*asked on November 17, 2014* -
## Physics

A 0.150kg baseball is thrown upwards with an initial speed of 20.0 m/s. What is the force on the ball when it reaches half its maximum height? (Disregard air resistance.) What is the force on the ball when it reaches its peak? The force on the ball is

*asked on April 9, 2007* -
## Literature

Which of the following best describes the shift in the speaker's tone toward Naett? a. from affectionate to proud b. from worshipful to gloating c. from emotional to detached d. from sentimental to concerned

*asked on November 15, 2016* -
## applying stoichiometry

4.00kg nitrogen dioxide reacts with 1.00kg water to produce nitric acid and nitrogen monoxide. Determine the limiting reactant and the theoretical yield of nitric acid in grams. How many grams of excess reactant are present after the reaction is complete?

*asked on February 5, 2012* -
## home economics

what are the five branches of home economics?

*asked on September 8, 2016* -
## Physics

A stone is catapulted at time t = 0, with an initial velocity of magnitude 18.6 m/s and at an angle of 41.6° above the horizontal. What are the magnitudes of the (a) horizontal and (b) vertical components of its displacement from the catapult site at t =

*asked on April 19, 2015* -
## Chemistry

A 100.0 mL sample of a 0.200 molar aqueous solution of K2CrO4 was added to 100.0 mL of a 0.100 molar aqueous solution of BaCl2. The mixture was stirred and the precipitate was collected, dried carefully, and weighed. How many grams of precipitate should be

*asked on December 1, 2014* -
## Geometry

One right circular cone is set inside a larger circular cone. The cones share the same Axis, the same vertex, and the same height. Find the volume of the space between the cones of the diameter of the inside cone is 6in., the diameter of the outside cone

*asked on May 6, 2013* -
## precal 2

find values for b such that the triangle has no solution A=88 degree, a=315.6

*asked on July 29, 2011* -
## Math

Shiela spent $120 on a coat. She spent 2/3 of her remaining money on a dress. She's left with 1/5 of her money. How much he money did she have to begin with?

*asked on November 8, 2015* -
## algebra

from 1990 to 2000, the number of thousand visits by people to hawaii volcanoes national park increased by about 43.1 thousand visits. per year. In 2000, there were about 1529.6 thousand visits to the park. write an equation that gives the number of

*asked on December 11, 2011* -
## Chemistry

At 298K and 1bar pressure, the density of water is 1.00 g/cm^3 , Cpm = and 75.3 J/Kmol. The change in volume with temperature is given by delta V = ViB(deltaT), where B, the coefficient of thermal expansion, is 2.07 * 10^-4 K^-1. If the temperature of 350g

*asked on September 24, 2012* -
## Algebra

What is the slope of the line that passes through the pair of points (3,8) and (9,5)? A. -2 B. 2 C. 1/2 D. -1/2 What is the slope of the line that passes through the pair of points (-7/2, -3) and (-5, 5/2)? A. 6/22 B. -6/22 C. 22/6 D. -22/6 Write and

*asked on January 12, 2016* -
## trig

A road has a 10% grade (slope). To the nearest degree what is the angle of elevation of the road? should I use sin?

*asked on May 27, 2014* -
## Math

A golfer hits a tee shot on a 285m long straight golf hole. The ball is hooked (hit at an angle) 14degree to the left. The ball lands 183m from the tee. How far is the ball from the hole?

*asked on August 31, 2012* -
## physics

A ball of mass 0.440 kg moving east (+x direction) with a speed of 3.80 m/s collides head-on with a 0.600 kg ball at rest. If the collision is perfectly elastic, what will be the speed and direction of each ball after the collision?

*asked on July 11, 2012* -
## Physics

A particle with a charge of -60.0 nC is placed at the center of a nonconducting spherical shell of inner radius 20.0 cm and outer radius 33.0 cm. The spherical shell carries charge with a uniform density of -2.02 µC/m3. A proton moves in a circular orbit

*asked on April 14, 2011* -
## math

To secure a 500 meter radio tower against high winds, guy wires are attached to a ring that is 5 meters from the top of the tower. The wires form a 15 degree angle with the tower. Find the distance from the base of the tower to the guy wire anchor in the

*asked on May 22, 2014* -
## Statistics

According to Pew Research, the contact rate (probability of contacting a selected household) in 1997 was 69% and in 2003 was 76%. However, the cooperation rate (proability of someone at the contacted household agreeing to be interviewed) was 58% in 1997

*asked on February 25, 2008* -
## Chemistry

The chemical 5-amino-2,3-dihydro-1,4-phthalazinedione, better known as luminol, is used by forensic scientists in analyzing crime scenes for the presence of washed-away blood. Luminol is so sensitive that it can detect blood that has been diluted 10,000

*asked on February 11, 2009* -
## Chemistry

A professor orders 250 mL of house coffee at precisely 95°C. She then adds enough milk at 10°C to drop the temperature of the coffee to exactly 90° C. Calculate the amount of milk (in mL) the professor must add to reach this temperature. Assume that the

*asked on September 23, 2014* -
## physics

A motorcycle daredevil is attempting to jump across as many buses as possible (see the drawing). The takeoff ramp makes an angle θ = 16.8° above the horizontal, and the landing ramp is identical to the takeoff ramp. The buses are parked side by side, and

*asked on September 21, 2014* -
## Chemistry

what will be the final temperature if 2000g of copper at 95 degrees loses 10 kcal of heat?

*asked on October 19, 2011* -
## Algebra

Tim's scores the first five times he plays a video game are listed below. 4,526 4,599 4,672 4,745 4,818 Tim's scores follow a pattern. Which expression can be used to determine his score after he played the video game n times. A.) 73n + 4,453 B.) 73(n +

*asked on November 16, 2015* -
## Physics

You are asked to consult for the city's research hospital, where a group of doctors is investigating the bombardment of cancer tumors with high-energy ions. The ions are fired directly toward the center of the tumor at speeds of 5.6 ×106m/s. To cover the

*asked on September 13, 2015* -
## Math (pre calculus)

The population of a certain town grows from 10,000 in 1982 to 35,000 in 1995. At this rate, in what year will the population reach 300,000? Tip* Population growth formula: P = P(subzero)multiplied by e^(k)(t)

*asked on December 12, 2013* -
## Chemistry

What is the molar concentration of sodium in a 200ml solution prepared from 1.223g of sodium phosphate?

*asked on June 26, 2012* -
## Chemistry

Consider the reaction: N2O4(g) 2NO2(g) delta H^o =58.576kJ; Keq =0.87 at 55degrees celsius What is the effect of each of these changes upon the concentration of N2O4 at equilibrium? a)increasing the temperature b)increasing the volume c) adding more NO2(g)

*asked on April 2, 2012* -
## chemistry homework help!!

Calcium Hydride reacts with water to produce hydrogen gas: CaH2(s) + H2O (l)---> Ca(OH)2 (aq) + H2 This reaction is sometimes used to inflate life rafts, weather balloons, and the like, where a simple, compact means of generating H2 is desired. How many

*asked on February 16, 2012* -
## Geometry

Given: in triangle ABC, angle B= 120 degrees Prove: angle A does not= 60 degrees Plan: use indirect proof Assume temporarily that Measure angle A = 60. Then measure angle C=60, and measure angles A+B+C=180= 60+B+60=180. Therefore the temporary assumption

*asked on June 12, 2007* -
## Chemistry

If a 0.192 g sample of copper metal reacts with elemental sulfur to form 0.240 g of the sulfide product, (a) find the percent by mass of copper and sulfur in the product and (b) find the empirical formula of the copper sulfide

*asked on February 24, 2014* -
## physics

Spymaster Paul, flying a constant 215 km/h horizontally in a low flying helicopter, wants to drop secret documents into his contact's open car which is traveling 155 km/h on a level highway 78.0 m below. At what angle ( to the horizontal) should the car be

*asked on September 14, 2011* -
## Chemistry

For which of the following atoms is the 2+ ion paramagnetic? Sn Mg Zn Mn Ba The answer is Mn. How do you figure this question out?

*asked on April 21, 2010* -
## Epidemiology

Can someone please check this for me to see if I am on the right track thanks? In a population-based cohort study, an entire community was interviewed regarding smoking habits and then followed for one year. All lung cancer deaths were ascertained and the

*asked on April 12, 2008* -
## chemistry

What [Ag1+] is required to start precipitation of AgOH from a saturated solution of Mg(OH)2? Ksp = 2.4 ✕ 10-8 for AgOH and Ksp = 2.6 ✕ 10-11 for Mg(OH)2

*asked on February 9, 2014* -
## math- bc calc

a building is 36 ft tall. A pulley is attached to the top of the building. A rope is looped through the pulley. One end of the rope is attached to the lantern that hangs vertically parallel to the side of the building. The rope passes up vertically from

*asked on October 29, 2014* -
## Math

A landscaper is preparing a circular flowerbed. The bed has a 12-foot diameter. He will need 13plants per square yard. How many plants should he buy?

*asked on August 30, 2012* -
## Physics

Three huskies are pulling a dog sled. The mass of the driver, sled and supplies is 145 kg. Snowy is pulling with a force of 83 N and 15.5degrees to the left of forward. Buster is pulling with a force of 75 N at 9degrees right of forward and Prince is

*asked on March 11, 2012* -
## geometry and measurement

Lila wants to build a fence around her pool. The pool is 25 feet long by 15 feet wide. The fence is to be 10 feet from the edge of the pool. how many feet of fencing will she need?

*asked on May 5, 2015* -
## algebra

A model car is constructed with a scale of 1 : 15. If the actual car is 12 feet long, which proportion represents the length x of the model car?

*asked on March 26, 2013* -
## physics

While fishing, you get bored and start to swing a sinker weight around in a circle below you on a 0.24 m piece of fishing line. The weight makes a complete circle every 0.60 s. What is the angle that the fishing line makes with the vertical?

*asked on November 18, 2011* -
## chemistry

Automotive antifreeze consists of ethylene glycol, C2H6O2, a nonvolatile electrolyte. Calculate the boiling point and freezing point of a 25.0 mass percent of ethylene glycol in solution.

*asked on January 31, 2010* -
## Geometry

Can some one please check these for me.Thanks Angle DEF is similar to Angle HJK and the scale factor of angle DEF to anle HJK IS 5/2. If EF =15 FIND JK Here is what I came up with Am I correct 5/2 = EF/JK 5/2 =15/JK 5(JK)=30 JK=30/5 JK=6 Given: ABCD is a

*asked on June 14, 2007* -
## physics

A small, 300 g cart is moving at 1.90 m/s on an air track when it collides with a larger, 2.00 g cart at rest. After the collision, the small cart recoils at 0.820 m/s. What is the speed of the large cart after the collision?

*asked on November 4, 2010* -
## Public HEALTH

Different measures of disease are useful to evaluate and assess public health programs and needs in different situations. For each of the following situations indicate (1) which measure (from the list below) would best be used, and (2) explain why you

*asked on March 16, 2008* -
## Stats

Suppose the correlation between SAT Verbal scores and Math scores is 0.57 and that these scores are normally distributed. If a student's Verbal score places her at the 90th percentile, at what percentile would you predict her Math score to be?

*asked on January 24, 2008* -
## chemistry

Determine the mass of CuSO4.5H20 needed to make 250 mL of a .100M CuSO4.5H20 aqueous solution..

*asked on October 9, 2012* -
## Calculus

After Lee gives his little sister Kara a big push on a swing, her horizontal position as a function of time is given by the equation x(t)= 3cost(e^-0.05t), where x(t) is her horizontal displacement, in metres, from the lowest point of her swing, as a

*asked on April 21, 2010* -
## geometry

Raul is laying a cement concrete walkway in his backyard. He decides to put a turn of 30° from the horizontal in the walkway to go around a tree and flowerbed. Once he gets past the tree, he wants to continue the walkway in the same direction as before.

*asked on November 17, 2015* -
## math

I am a number between 60 and a 100. My ones digit is 2 less than my tens digit. I am a prime number. What am I? Explain.

*asked on December 9, 2014* -
## physics

A 5-kg box is released on a 30 degree incline and accelerates down the incline at 2.79 m/s^2. To the nearest tenth of a Newton, what is the friction force impeding its motion?

*asked on November 16, 2012* -
## Math

A kite has a string 100m long anchored to the ground. The string makes and angle with the ground of 65 degree. What is the horizontal distance of the kite from the anchor?

*asked on August 30, 2012* -
## math

Tyler buys a stereo system for $1200, and pays for it using a credit card. This particular card charges 1.5 percent monthly interest on the unpaid balance, and requires a minimum payment of $20 each month. Suppose that Tyler pays only the minimum amount

*asked on November 14, 2011* -
## algebra 2/trig

Tina can paint a room in 8 hours, but when she and her friend Emily work together, they can complete the job in 3 hours. How long would it take Emily to paint the room alone?

*asked on April 9, 2014* -
## Chemistry

A current of 2.34 A is delivered to an electrolytic cell for 85 minutes. How many grams of Au will be deposited from an aqueous solution of AuCl3?

*asked on April 28, 2013* -
## math hw (algebra)

On the sidewalk the distance from the dormitory to the cafeteria is 400 meters. By cutting across the lawn, the walking distance is shortened to 300 meters. how long is each part of the L shaped sidewalk?

*asked on April 25, 2013* -
## Math

A children's play area is triangular. The sides of the play area measure 90m, 225m and 255m respectively. Calculate the area of the play area.

*asked on August 31, 2012*