# Posts by rachel

Total # Posts: 1,592

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

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 the maximum? area?

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

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

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 hours c. More than ...

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 of Equality C:a. Given...

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 need an actual ...

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

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 m?PTR = 8x - 6

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

math
wait actually that question I posted before completing it...I will repost it

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

Math
Yes

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.

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

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?

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

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

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

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

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

Maths
Thank you!

Maths
Which works out at 4.8 bags?

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?

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

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

math
It's 16?

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?

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?

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

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.

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

Math
Fraction: M is 1/6. A is 1/4. T is 1/6. H is 1/12. E is 1/12. I is 1/12. C is 1/12. L is 1/12. Decimal: Both M and T are 0.166667, A is 0.25, and H,E,I,C,and L are all 0.083333 Percentage: M is 16.6%. T is 16.6%. A is 25%, H is 8.3 %. E is 8.3%. I is 8.3%. C is 8.3%. L is 8.3%

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?

Maths
Is it A=SxS 2mx2m=4m 1m=100cm =400/20=20tiles

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.

Maths
Plz help me understand this

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 the square figure ?

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

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 Sieving but only 4 of ...

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

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

Pre calc
Sorry steve not everyone is as smart as you. Thanks for your help tho

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

Pre calc

Pre calc
The answer I keep getting is -3 square root of 10 over 130

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

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 temperature of the ...

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!!!

Calculus
the problem is asking me to use optimization to find the minimum surface are and then determine how much it would cost to make it

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 square centimeter. ...

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 cover. (Round your ...

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.

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

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

civics
C. Major rule. The people were supposed to be able to have control over the laws that were made and how their country was ruled. Decisions were made based on the majority of opinion.

math
I meant to type that it seemed like it would cost at least 1,000

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 over the past 5 years. I...

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?

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?

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

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

math
That was my mistake. It was supposed to say k=?

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

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 microwave popcorn...

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

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

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

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

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

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?

Math
Thanks. All of this was right except it was southwest instead of northeast.

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

Math
Thank you

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

Math
Dunno

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

Language Arts

write teacher
Interesting Facts about Frederick Douglass Douglass was married to his first wife Anna for 44 years before she died. They had five children. John Brown tried to get Douglass to participate in the raid on Harpers Ferry, but Douglass thought it was a bad idea. He was once ...

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 height of 6m above ...

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?

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?

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

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

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

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?

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?

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 60 grams.

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

american government
Every school has a different cirriculum where they expect different answers. However, cheating is not right and you should be able to study your own answers. If you got a question, you cannot blame anyone but yourself cuz you tried to cheat. Duh. *rolls eyes* what an idiot

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.

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 heat is ...

PRE-CAL
ok this worked out great! thank you!

PRE-CAL
the table is just that r 2% 4% 6% 8% 10% 12% t ? ? ? ? ? ? i will try that out then Thank you

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 ln of both sides? (...

PRE-CAL
Thank you so much!

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 ?

Social Studies
Another word for lines of latitude is what?

Social studies
The degree of latitiude is always listed where It is a cross word

AP Chemistry
The reaction of 5.7 grams of fluorine with excess chlorine produced 7.6 grams of ClF3. What percent yield of ClF3 was obtained? Answer in units of %.

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