# Rachel

Newest questions and responses by Rachel-
## Math

What is the unknown digit that will make this problem true 3.59>3.5

*asked on October 18, 2018* -
## Physics

Three vectors are shown in the figure. Their magnitudes are given in arbitrary units. Determine the sum of the three vectors. Give the resultant in terms of (a) magnitude and (b) the angle within the positive x axis.

*asked on September 24, 2018* -
## Math

If it is 5° outside and the temperature will drop 17° in the next Six hours, how cold will it get?

*asked on September 7, 2018* -
## Algebra 2

the lengths of the sides of a triangle are in the radio 5 : 6 : 7. if the perimeter is less than 54 cm , what is the length of the longest side?

*asked on August 23, 2018* -
## math

Your current cell phone company charges $30 per month for unlimited texting. Another company charges $20 per month for the first 500 texts plus 5 cents each for any additional text. Should you keep your current current service or switch to the other?

*asked on August 9, 2018* -
## Math

Can someone help me on how to do this without a calculator. It would really help me out thanks The problem is below An item on sale costs 65% of the original price. The original price was $15 .

*asked on April 23, 2018* -
## chem

Based on the ratio of mean moles of O2/mol KClO3 what is the chemical equation for the reaction that occurred? Why? Is this conclusion in accord with the mass of the solid product that you obtained? Explain

*asked on April 8, 2018* -
## Math

Sales of a video game released in the year 2000 took off at first, but then steadily slowed as time moved on. The table below shows the number of games sold, in thousands, from the years 2000–2010. Year 2000 2001 2002 2003 2004 2005 Number Sold

*asked on April 5, 2018* -
## Math

Determine the expotential growth equation from the following table? Year 2007: 1.6 million subscribers Year 2008: 2.7 Year 2009: 4.4 Year 2010: 6.4 Year 2011: 8.9 Year 2012: 13.1 Year 2013: 19.3 Year 2014: 28.2 Year 2015: 38.2 Year 2016: 48.7 A. What is

*asked on April 5, 2018* -
## chem

A researcher studying the nutritional value of a new candy places a 3.50-gram sample of the candy inside a bomb calorimeter and combusts it in excess oxygen. The observed temperature increase is 2.23 °C. If the heat capacity of the calorimeter is 31.30

*asked on March 21, 2018* -
## chem

If the heat of combustion for a specific compound is -1160.0 kJ/mol and its molar mass is 90.75 g/mol, how many grams of this compound must you burn to release 823.00 kJ of heat?

*asked on March 21, 2018* -
## chem

A 8.00-L container holds a mixture of two gases at 23 °C. The partial pressures of gas A and gas B, respectively, are 0.349 atm and 0.819 atm. If 0.210 mol of a third gas is added with no change in volume or temperature, what will the total pressure

*asked on March 8, 2018* -
## chem

1.45 g of an unknown gas at 53 °C and 1.10 atm is stored in a 1.85-L flask. What is the density of the gas what is the molar mass of the gas

*asked on March 8, 2018* -
## Chem

How many molecules are there in an ideal gas with a volume of 1.99 L at STP?

*asked on March 8, 2018* -
## Chem

If 2.41 moles of an ideal gas has a pressure of 4.65 atm, and a volume of 27.33 L, what is the temperature of the sample in degrees Celsius?

*asked on March 7, 2018* -
## chem

If 63.5 moles of an ideal gas is at 4.03 atm at 51.80 °C, what is the volume of the gas?

*asked on March 7, 2018* -
## Chem

If 86.5 mol of an ideal gas occupies 13.5 L at 79.00 °C, what is the pressure of the gas?

*asked on March 7, 2018* -
## Chem

A sealed container holding 0.0255 L of an ideal gas at 0.989 atm and 71 °C is placed into a refrigerator and cooled to 45 °C with no change in volume. Calculate the final pressure of the gas.

*asked on March 7, 2018* -
## chem

A flexible container at an initial volume of 4.11 L contains 7.51 mol of gas. More gas is then added to the container until it reaches a final volume of 15.9 L. Assuming the pressure and temperature of the gas remain constant, calculate the number of moles

*asked on March 7, 2018* -
## Chem

A sample of an ideal gas has a volume of 3.20 L at 14.80 °C and 1.50 atm. What is the volume of the gas at 21.80 °C and 0.989 atm?

*asked on March 7, 2018* -
## Chem

A balloon is inflated to a volume of 7.0 L on a day when the atmospheric pressure is 765 mmHg. The next day, as a storm front arrives, the atmospheric pressure drops to 725 mmHg. Assuming the temperature remains constant, what is the new volume of the

*asked on March 7, 2018* -
## chem

A hot air balloon is filled with 1.51 × 106 L of an ideal gas on a cool morning (11 °C). The air is heated to 103 °C. What is the volume of the air in the balloon after it is heated? Assume that none of the gas escapes from the balloon.

*asked on March 7, 2018* -
## Chem

Complete and balance the molecular equation, including phases, for the reaction of aqueous sodium sulfate, Na2SO4, and aqueous barium nitrate, Ba(NO3)2. I don't know how to do this please help

*asked on March 1, 2018* -
## CHEM

A reaction of 48.5 g of Na and 53.7 g of Br2 yields 55.4 g of NaBr. What is the percent yield? 2Na+Br2 2NaBr

*asked on February 20, 2018* -
## chem

determine how many grams of N2 are produced from the reaction of 8.75 g of H2O2 and 5.43 g of N2H4. 2H2O2+N2H4 4H2O+N2 g N2?

*asked on February 20, 2018* -
## chem

If 6.64 moles of C5H12 reacts with excess O2, how many moles of CO2 will be produced in the following combustion reaction? Can plz explain how to do it Thank You

*asked on February 12, 2018* -
## math

Solve the following system of equations: 4x+y–2z=10 2x–y+2z=–9 x+y+z=6

*asked on December 17, 2017* -
## math

A rectangular playground is to be fenced off and divided in two by another fence parallel to one side of the playground. Five hundred and forty feet of fencing is used. Find the dimensions of the playground that maximize the total enclosed area. What is

*asked on December 10, 2017* -
## math

Determine whether QS || PT . Justify your answer. PQ = 18, QR = 6, RS = 12, ST = 36

*asked on December 9, 2017* -
## math

Find x so that QS || PT PQ = 8, QR = 5, RS = 15, ST = x + 3

*asked on December 9, 2017* -
## Math

A company makes batteries with an average life span of 300 hours with a standard deviation of 75 hours. Assuming the distribution is approximated by a normal curve fine the probability that the battery will last . Less than 250 hours b. Between 225 and 375

*asked on November 23, 2017* -
## Geometry

Complete two column proof. Given: x/6+2=15 Prove: x=78 x/6+2=15 A:______ x/6=13 B:______ x=78 C:_______ A:a. Given b. Subtraction Property of Equality c. Division Property of Equality B:a. Given b. Addition Property of Equality c. Multiplication Property

*asked on November 15, 2017* -
## Math (please help)

im not sure if my question posted before because it isn't showing up when I look for it In /\PRS, segment PT is an altitude and segment PX is a median. Find RS if RX = x + 7 and SX = 3x – 11 for this one I figured out that RS=4x+-4...but I think I

*asked on November 10, 2017* -
## math

Matching: The segments used in reference to the triangle vs. concurrent point. Write the correct letter by the word. 1. Altitudes 2. Angle bisectors 3. Medians 4. Perpendicular Bisectors A. Centroid B. Circumcenter C. Incenter D. Orthocenter

*asked on November 10, 2017* -
## math

In PRS, segment PT is an altitude and segment PX is a median. Find RS if RX = x + 7 and SX = 3x – 11 Find RT if RT = x – 6 and mPTR = 8x - 6

*asked on November 10, 2017* -
## math

In ABC, segment BF is the angle bisector of ABC, Segments AE, BF, and CD are medians, and P is the centroid. Find x if DP = 4x – 3 and CP = 30. Find y if AP = y and EP = 18

*asked on November 10, 2017* -
## math

In ABC, segment BF is the angle bisector of angle ABC, Segments AE, BF, and CD are medians, and P is the centroid.

*asked on November 10, 2017* -
## math

In a random sample of 200 students who were asked their favorite color, it was found that twenty more students liked blue than purple and eight fewer liked green than blue. Find the number of students who chose each color as their favorite.

*asked on November 6, 2017* -
## Math

Given: measure of angle D=~ measure of angle F ; line GE bisects angle DEF Prove: line DG=~ line FG =~ is the congruent sign

*asked on October 27, 2017* -
## Chemistry

The Haber process developed to produce fertilizer from nitrogen and hydrogen, is governed by the following unbalanced reaction: a N2 + b H2 -> c NH3 . If 10.5 kg of NH3 product is required, how many kg of hydrogen are required if nitrogen is in excess?

*asked on October 24, 2017* -
## math

Given the function f(x) = x2– 3x + 3, find the following: f(-2) = _________ f(5) = _______

*asked on October 20, 2017* -
## math

Give the domain and range of the following functions: f(x) = 1⁄4x – 7 g(x) = 3x2+ 2

*asked on October 20, 2017* -
## Science

Scientific _____ involves knowledge and understanding necessary for evaluating information, making personal decisions, and taking part in public affairs. Please help!!

*asked on October 20, 2017* -
## math

Find the midpoint of the line segment with endpoints (3, 10) and (–1, –16)

*asked on October 12, 2017* -
## math

Find the slope of the line that goes through the points (-6, 3) and (2, 3).

*asked on October 12, 2017* -
## Maths

A baker uses 3/5 of a bag of flour to make 6 muffins. How many bags of flour will he need to make 48 muffins?

*asked on October 2, 2017* -
## math

Segments MN, LT, PQ, and OR all intersect at point S. If m∠LSO = m∠PSN , prove m∠LSP = m∠OSN . write a two column proof

*asked on September 30, 2017* -
## Logic

Is this an imperative, declaritive, interrogative or exclamatory 1.God exist answer: exclamatory 2.What are you up to? answer: interrogative 3. Some dentist have clean teeth answer: imperative

*asked on August 31, 2017* -
## math

A square 4 inches on a side is cut up into smaller squares 1 inche on a side. What is the maximum number of such squares that can be formed?

*asked on July 18, 2017* -
## physics

Block A (mass = 3 kg), moving at +5 meters per second, collides with stationary block B (mass = 4 kg). Block A comes to a sudden stop, while block B starts moving. What will be the approximate final speed of block B?

*asked on June 5, 2017* -
## Maths

Four decimal numbers are given below. Which THREE numbers, when added together, would result in a whole number? 0.9,0.45,0.65,0.3 0.9=9/10 0.45=45/100(9/20) 0.65=65/100(13/20) 0.3=3/10 Can you plz help me!!! Thanks

*asked on June 3, 2017* -
## Geometry

TV screens are measured on the diagonal. If we have a TV-cabinet that is 72 inches long and 64 inches high, how large a TV could we put in the space (leave 2-inches on all sides for the edging of the TV)? Round your answer to the nearest tenth.

*asked on June 2, 2017* -
## Algebra 2

Write a polynomial function f of least degree that has rational coefficients, a leading coefficient of 1, and the given zeros 2, 2i, and 4-sqrt 6

*asked on June 1, 2017* -
## Geometry

A flat screen television is advertised as being 59 inches on its diagonal. If the TV is 13 inches tall, then how wide is the screen?

*asked on May 30, 2017* -
## Maths

A tile layer is laying tiles on a square wall of sides 2metres. If each tile measures 20cm by 20cm,calculate: 1. The number of tile required to tile the entire wall. 2. The cost of the tiles if they are sold at $2.00 each.

*asked on May 27, 2017* -
## Maths

Judy made a rectangular shaped figure of dimensions 20cm by 5cm with a piece of clay . She then took the same amount of clay and made a square figure. If the thickness of the square is the same as that of the rectangle, calculate the length of one side of

*asked on May 27, 2017* -
## Math

A square field has a side of 50 meters.How many times must an athlete jog around this field to cover a distance of 3 kilometers? Area = S x S = 50 × 50 =2500 meters .... I'm stuck

*asked on May 27, 2017* -
## science

How would you separate a mixture of small beads, sand, iron filings, salt, and water, using a magnet, filter funnel, filter paper, bunsen burner and a tripod with a bunsen burner? I thought of Filtration, Evaporation, Distillation, Magnetism, and even

*asked on May 13, 2017* -
## Geography

Why did the original farms on the Prairies turn out to be too small? What happened as a result of this?

*asked on May 10, 2017* -
## chem

How many moles of O2 are contained in 5.25 L at 26 degrees Celsius and 1.2 atm?

*asked on April 27, 2017* -
## Pre calc

Please help me proof the identity. This isn't even math to me, I can not understand it so please show all work. God bless A)1-cos2x/sin2x=tanx B) sin4x/sinx=4cosxcos2x

*asked on April 13, 2017* -
## Pre calc

sin(θ − ϕ); tan(θ) = 5/12 θ in Quadrant III, sin(ϕ) = − sqaure root 10/10 ϕ in Quadrant IV I tried this numerous times can somone please help me

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

Assume you are performing the calibration step and you begin with 70 g of water at 20*C and 70 g of water at 80*C. After adding the two portions of water into your calorimeter setup and following the procedure outlined in the experiment, you determine the

*asked on April 5, 2017* -
## precal Please Help

1-cos (2A)/2sin A+ SIN (2A)= tan (A/2) I need to verify the identity I have no idea how to do that and I have a test please explain!!!

*asked on April 3, 2017* -
## Calculus

A manufacturer needs to produce a cylindrical can with a volume (capacity) of 1000cm cubed. The top and the bottom of the container are made of material that costs $0.05 per square cm, while the side of the container is made of material costing $0.03 per

*asked on March 30, 2017* -
## pre calc

To measure the height of the cloud cover at an airport, a worker shines a spotlight upward at an angle 75° from the horizontal. An observer D = 600 m away measures the angle of elevation to the spot of light to be 45°. Find the height h of the cloud

*asked on March 28, 2017* -
## A.P Chemistry

For a certain reaction ∆H is 54 kJ/mol and ∆S is 128 J/mol · K. This reaction can become spontaneous only above some temperature. What is this temperature? Answer in units of ◦C.

*asked on March 20, 2017* -
## Math

Find the magnitude and direction angle of p = 42i + 35j

*asked on March 19, 2017* -
## Math

Find the exact value of the trig function below. cos a/2 if cosa = - 31/49 (assume cos a/2 is negative)

*asked on March 19, 2017* -
## math

The annual cost of a gym membership can be represented by the function C(t)=300-5t, where t is the number of years that one has belonged to the gym. If Jeffrey has been a member for 5 years, what is the total amount of money that he has paid to the gym

*asked on February 27, 2017* -
## math

There are 4 romantic novels and 6 adventurous novels on a book shelf. Without looking, Carmen chooses two novels out of the shelf. What is the probability that she chooses 2 romantic novels?

*asked on February 26, 2017* -
## math

The probability that Jeff will be accepted to Green Valley College is 3/4, and the probability that Justin will be accepted to Blue Ridge College is 2/5. What is the probability that Justin will be accepted and Jeff will not?

*asked on February 26, 2017* -
## math

If 8^x = 12, then 24^x = ? Estimate your answer to one decimal place.

*asked on February 25, 2017* -
## math

If 8.2^p = 10.5^q, then p/q = ? Estimate your answer to two decimal places.

*asked on February 25, 2017* -
## math

If 16x^2 - 24x + k = 0 has two roots (a double root) equal to 3/4, 4 = ?

*asked on February 25, 2017* -
## math

For his troops' popcorn fundraiser sale, Mike sold caramel corn for $10, buttered microwave popcorn for $8, and lightly buttered popcorn for $7. By the end of the fundraiser, he had sold 400 items and made $3,272. If he sold twice as many lightly buttered

*asked on February 23, 2017* -
## physics

a force of 372 N is used to move a piano with a maass of 532 kg up a ramp 14 m long. what is the vertical height of the ramp

*asked on February 13, 2017* -
## math

If g(x)=x+3 h(x)=9-x^2, what is the maximum of h(g(x))?

*asked on February 9, 2017* -
## Math

If cscØ = 4/3, find sinØ + sinØ cot^2 Ø

*asked on February 9, 2017* -
## Math

If g(x)=x+3 h(x)=9-x^2, what is the maximum of h(g(x))?

*asked on February 7, 2017* -
## Calculus

Find the magnitude and direction angle of p=42i+35j

*asked on February 4, 2017* -
## Math

A line has parametric equations x=7t-2 and y=-4+3t. What is the slope of the line representing the direct relationship between x and y?

*asked on January 17, 2017* -
## Trigonometry

Find the magnitude and direction angle of v = -7i + 3j

*asked on January 17, 2017* -
## Math

Find the components of vector u with a magnitude of 10 and a direction angle of ∅=54° Help??

*asked on January 17, 2017* -
## Math

1/3 pitcher water + 2 apple juice - 1/3 carton milk =

*asked on January 3, 2017* -
## Math, Quadratic equaitons

A toy rocket is launched form a 3m platform, at 8.2m/s. The height of the rocket is modelled by the equation h=-4.0t^2+8.1t+3 where h is the height, in metres, above the ground and t is the time, in seconds. After how many seconds will the rocket rise to a

*asked on November 20, 2016* -
## Math

a recipe for 2 dozen cookies calls for 1 1/3 cups of flour.how much for would be needed to make five dozen cookies?

*asked on November 4, 2016* -
## Statisics

The closing price of Schnur Sporting Goods Inc. common stock is uniformly distributed between $23 and $37 per share. What is the probability that the stock price will be: More than $33? Less than or equal to $27?

*asked on November 3, 2016* -
## Algebra

Find the next three terms of the Arithmetic sequence, 3/4,1/2,1/4,1,..

*asked on November 2, 2016* -
## Math

I have a dash of sugar and I need to add flour with a 1:10 weight ratio of sugar to flour so how much flour do I need

*asked on October 28, 2016* -
## math

form a polynomial with a degree of 4 zeros 4,-3i,1 and multiplicity 2

*asked on October 20, 2016* -
## Physics

A shopper pushes a cart 50 m south down one aisle and then turns 90.0° west and moves 12 m. He then makes another 90.0° turn and moves 20 m. What is the largest possible displacement of the shopper?

*asked on October 18, 2016* -
## PRE-CAL

Factor the trigonometric expression. There is more than one correct form of the answer. cot^2 x + csc x − 19 NOT SURE WHETHER TO REPLACE THE COT WITH COS^2X/SIN^2X THEN CSCX TO 1/SINX?

*asked on October 18, 2016* -
## Science

Answer with solution, plz. 1. What is the concentration of the solution by volume when dissolved is used 30 grams & the water is 60 grams. 2. How much solvent in grams is present in a solution with a concentration by volume of 40% the solute of content is

*asked on October 3, 2016* -
## Math

Jim has $87. He spends $6 for socks and at least $32 for shoes. How much does he have left to spend on shirts? I know the answer is >49 I need to find the inequality equation. Thank you

*asked on September 28, 2016* -
## Chemistry

PLEASE HELP OR I WILL FAIL What would be the final temperature of the system if 16.6 g of lead at 138 ◦C is dropped into 23.4 g of water at 8.68 ◦C in an insulated container? The specific heat of lead is 0.128J/g◦C.

*asked on September 23, 2016* -
## AP Chemistry

(DrBob222 please help me) A sample of 1.97 grams of Z is dissolved into 500 grams of water which is in a styrofoam coffee cup. The temperature is monitored and is found to rise from 25.015◦C to 25.484◦C. What is ∆Hsolution for substance Z? Assume no

*asked on September 22, 2016* -
## PRE-CAL

Complete the table for the time t (in years) necessary for P dollars to triple when interest is compounded continuously at rate r. (Round your answers to two decimal places.) R=2% t=? tried to plug in as A=Pe^rt since continiously 3=e^.02t ? then take the

*asked on September 17, 2016* -
## PRE-CAL

Complete the table assuming continuously compounded interest. (Round your answers to two decimal places.) Initial Investment== ? Annual % Rate== ? Time to Double== 11YRS Amount After 10 Years== $1600 Using formula A=Pe^rt ?

*asked on September 17, 2016* -
## Social Studies

Another word for lines of latitude is what?

*asked on September 13, 2016*