# Posts by Jen

Total # Posts: 3,535

**Math**

First student bought art, math and history books for $72. a+m+h=72 Second student bought art, chemistry and history books for $80. a+c+h=80 Third student bought chemistry, math and history books for $61. c+m+h=61 Fourth student bought art, math and chemistry books for $57. a+m...

**Math**

55÷11+7x(2+14)

**Social studies**

5. What effect on the Columbian exchange does this image illustrate? (A). The population boom of domesticated animals that escaped into the wild. (B). The conversion of the physical environment.*** (C). The introduction of milk cows to the North Americans of the Midwest. (D). ...

**Social studies**

2. According to the map, how did people first arrive in North America? (A). They traveled by boat from Africa. (B). They sailed across the Atlantic ocean. (C). They migrated from South America to North America. (D). They walked or paddled from Asia to North America.*** 3. ...

**algebra**

Chris can be paid in one of two ways. Plan A is a salary of ?$380 per? month, plus a commission of 9?% of sales. Plan B is a salary of ?$656 per? month, plus a commission of 3?% of sales. For what amount of sales is Chris better off selecting plan? A?

**math**

zeros are real number? true or false

**math**

the seat of real number is the union of the set of irrational number true or false?

**math**

a wire whose length is at most 114cm,is bent to form a rectangle.If the length of the rectangle is 5cm longer than the width, what is the maximum area of the rectangle?

**math**

the largest among three positive consecutive odd numbers is greater than the sum of -4 and the product of 3 and the smallest number. Determine the three numbers. z>-4+3 is the equation I have made but I do not know what to do next.pls. help me. thank you.

**Chemistry **

A saturated solution of NH4Cl was made using 500g of water at 90 degrees. the solution was cooled to 50 degrees. what mass of NH4Cl was crystallized

**Macroeconomics(PLEASE HELP)**

4. Techniques of Production Resource Resource Prices Land $4 Labor $2 Capital $5 Entrepreneurial Ability $3 Possible ProductionTechniques I II III IV 4 6 8 9 6 7 9 9 5 4 3 2 1 1 1 2 a. Which technique is the most efficient? b. If the most efficient technique is used and ...

**The End of the Cold War**

Can someone help me

**The End of the Cold War**

1. Which is the best example of how Reagan dealt with the Soviet Union from a position of strength? A. development of the strategic defence initiative B. U.s withdrawl of the salt II treaty from senate approval C. Reagan condemning martial law of Poland D U.S support of the ...

**Math**

Ned answers to the Exponets and Divsions test

**Math**

1. x^9/X^2 x^11 X^7 7 X^5

**ChemistryPLEASE HELP! **

Is calculating the molar mass part of determing the ions for #1 and then the mol for #3

**Chemistry **

I'm not sure how to do these and when I looked it up, maybe there was a diff. vocab used. Please help! 1.) How do you do atom/ion inventory of : Cu3(PO4)2 A. _____ formula units Cu3(PO4)2 B. _____ atoms Cu C. _____ atoms P D. _____ atoms O E. _____ ions Cu2+ F. _____ ions ...

**English **

Would "“The chain that bound her here was of iron links..." be a hyperbole? If not, than what literacy device is this?

**Physics **

A billiard ball 0.62 kg moving at 8.2 m/a elastically strikes a bowling ball, 3.2 kg moving in opposite direction at 1.2 m/s Calculate final velocities The kinetic energy before the collision The kinetic energy after the collision

**stats.help!**

Each year, 64 college basketball teams compete in the NCAA tournament . Sandbox . com recently offered a prize of $10 million to anyone who could correctly pick the winner in each of the tournament games. A. How many games are required to get one championship team from the ...

**Math7/8**

ANNIKA HAS A SOCK FILLED WITH 3 RED MARBLES AND 5 GREEN MARBLES. WHAT IS THE PROBABILITY OF HER CHOOSING TWO RED MARBLES WITH AND WITHOUT REPLACEMENT?

**U.S History**

idekrightnow is correct 8/8

**Physics**

A ball is shot from the top of a building with an initial velocity of 20 m/s at an angle ? = 39° above the horizontal. If a nearby building is the same height and 55 m away, how far below the top of the building will the ball strike the nearby building?

**Finance**

Sheet Metals has an outstanding loan that calls for equal annual payments of $12,600.47 over the life of the loan. The original loan amount was $72,000 at an APR of 8.15 percent. How much of the third loan payment is interest? $5,868.00 $4,725.89 $4,896.48 $5,009.16 $4,687.53

**Finance**

I figured it out!

**Finance**

You want to purchase a new condominium that costs $287,500. Your plan is to pay 25 percent down in cash and finance the balance over 15 years at 3.75 percent. What will be your monthly mortgage payment including principal and interest? $1,568.07 $1,333.33 $1,708.16 $1,221.43 $...

**American Government**

@Writeacher? wth I didn't know you were the boss of this website, and that you limited each student to only two guesses? AHAHAHAHAHAHA

**american goverment check answers**

Anon is right once again, thanks b

**Algebra**

The arch of the bridge below is half an ellipse, a "semi-ellipse". The arch is 148m long and has a height of 48m at the center. The height of the arch is 10m at point p. What is the distance from p to the center?

**american goverment check answers**

Thx anon!

**Math**

the area of a rectangle is given by the expression (x^3+7x^2+11x+2) in^2. The length of the rectangle is given by the expression (x+2) in. What is an expression for the width of the rectangle?

**American Government**

CORRECT @answer check

**Chemistry (HELP AGAIN)**

You were finding (g) but the question is asking to CALCULATE THE MOLES OF HYDROGEN GAS PRODUCED which I'm really confused about because I don't know how to go about this question now knowing the chemical reaction that occured. I'm sorry but can you find the Moles. ...

**Chemistry(HELP) MathMate**

Thank you. Is there any chance that you could write it mathematically from your explanations. I have a hard time trying to decipher the work from standard form to numbers. I really appreciate the explanation though!

**Chemistry**

Also, In this experiment hydrogen gas is collected over water and can be referred to as a "wet" gas. Why is "wet" gas as an appropriate term for this? Is it because hydrogen gas is collected over water, which is wet?

**Chemistry! Help**

I don't understand how you would calculate the moles with a chemical equation given the 7.00 g of Magnesium.

**Chemistry**

A.) Write a balanced chemical Eq'n for a reaction between MAGNESIUM & HYDROCHLORIC ACID. Answer: Magnesium + Hydrochloric Acid Mg (s) + 2 HCL (ag) ---- MgCl2 (aq) H2(g) B.) Assuming 7.00 g of Magnesium completely react according to the above Eq'N, calculate the MOLES ...

**algebra**

Elimination method or substitution method. 1. 3/5x = 1/2y + 11 2. 3x + 8y + 13

**Science**

Each heating element has a resistance of 5 ?. The current passing through each element is 0.4. Calculate the total resistance of the six heating elements.

**math**

A restaurant offers seven different main courses,,eight types of drinks and four kind of desserts. How many different meal consisting of main course,a drink and a dessert does the restaurant offer?

**Math**

When calculating area, you always multiply. Area= Length X Width.

**Math**

Many times, the author of an assignment will include common mistakes as answer choices. You then need to check your answer by making sure it makes sense. If she buys more than twice as much as she did the first time, will the answer be greater than or less than the amount she ...

**Math**

Since the problem says "2 1/2 times" you are going to multiply. If you are getting the same answer dividing, you are dividing incorrectly. My guess is that you are not flipping the second fraction before multiplying when you are dividing (to divide fractions, you ...

**Math**

If your teacher wants to keep it in fractions... Convert 21 7/8 into an improper faction of 175/8 and 2 1/2 into 5/2. Multiply together and reduce/ convert to mixed fraction of 54 11/16.

**8th Grade Journalism**

1. Suggest- The principal received the exam results and announced over half of the students who took the exam failed the exam. 2. The administration recently conducted talks to determine... 3. A faulty ladder killed a construction worker last week... Basically- try to make the...

**chemistry**

The actual question is: A sample is analyzed to determine its iron content (as Fe2+0 via a redox titration with potassium chromate as the titrant. In the titration Fe2+ is oxidized to Fe3+ and CrO4(2-) is reduced to Cr3+. What is the percent by mass of iron in the sample if 0....

**chemistry**

Fe2+ is oxidized to Fe3+ and CrO4is reduced to Cr3+ using an unknown sample containing Fe2+ and 0.04322M K2CrO4 solution in a redox titration. I first need to balance the formula, but I don't know what to do with the potassium.

**Math**

I got 6 when solving for M but i dont know how to explain

**Math**

Im sorry Im new to this how do I solve for M 30+25M = 300-20M

**Math**

Two hot air balloons are in flight above a field. The first Balloon is 30 meters above the ground rising 25 meters per minute. The Second Balloon is 300 meters above the ground descending 20 meters per minute. When will the 2 balloons be at the same altitude? What would be the...

**anatomy**

True

**math 9**

Given Parallelogram ABCD with AB=(3x-5)cm, BC=(2y-7)cm, Cd=(x+7)cm, AD=(y+3)cm

**Chemistry**

How many electrons in an atom could have these sets of quantum numbers? n=2 n=5, l=3 n=6, l=1, ml=-1

**chemistry**

the word "proof" on alcoholic beverages is defined as twice the percentage by volume. How many ml of alcohol are in a one-liter bottle of 80-proof gin?

**chemistry**

how much solute are present in a solution that contains 100.0g of water, and is 9.0% by weight sodium bicarbonate?

**chemistry**

how many grams of potassium nitrate are needed to prepare 250.0ml of a 0.03M potassium nitrate solution?

**chemistry**

calculate what volume of sulfuric acid solution(specific gravity=1.07;and containing 10%sulfuric acid by mass)contains 18.50g of pure sulfuric acid at a temperature of 25 Celsius.

**chemistry**

what volume of a 0.20M potassium sulfate solution contains 57g potassium sulfate?

**chem 15**

The hardness of water (hardness count) is usually expressed as parts per million (by mass) of calcium carbonate. What is the molar concentration of calcium ions in a water sample with a hardness count of 175ppm?

**chem 15**

A bottle of a certain ceramic tile cleanser, which is essentially a solution of hydrogen chloride, contains 130 g of HCl and 750 g of water. What is the percent by mass of HCl in this cleanser?

**Statistics**

The Citiburg Parks Department has just installed 1100 new lightbulbs with an expected mean lifespan of 64 months and a lifespan standard deviation of 8 months. Assuming normally distributed bulb failure, how many bulbs will need to be replaced after 49 months? Round your ...

**Statistics**

The Townville Parks Department has just installed 1900 new lightbulbs with an expected mean lifespan of 75 months and a lifespan standard deviation of 12 months. Assuming normally distributed bulb failure, how many bulbs will need to be replaced after 53 months? Round your ...

**algebra**

find the x-intercepts, f(x)=-9x^2-48x-64

**Math**

How many 10-inch pieces can be cut from a 6-foot piece of shelving?

**math**

amara rode her bicycle 8 miles in 0.5 hours.what was the average rate that she rode her bicycle in miles per hour?

**Geometry**

A map has the scale 2.5 inches:.75 miles. The distance from east to west is 6 inches what is the distance in miles

**Calculus**

1. Use a graph to estimate the limit. Use radians unless degrees are indicated by θ°. (Round your answer to four decimal places.) lim θ → 0 θ/tan(7θ) 2. Assuming that limits as x → ∞ have the properties for limits as x → c, use ...

**Chemistry**

Write the net ionic equation for the equilibrium that is established when ammonium nitrate is dissolved in water. (Use H3O+ instead of H+)

**Physics**

A: 4.16 N B: 4.16/588

**Social Studies**

What were some of the advantages the continental army had over the British? Select all that apply. Fighting on familiar territory*** A large navy More troops*** Better supplies

**Science**

A family is planning to build a raised planting area using a blend of peat moss, mulch, and a rich organic soil in which to grow the plants. they have been told first to place on the ground a layer of material that will allow for a proper drainage each time the plants are ...

**algebra**

90 students from three different classes, A, B, and C are going on a field trip. Class A has 32 students and Class B has 28 students. Write an equation to describe the situation.

**Chemistry**

The homework question said "which 2nd row element has 6 valence electrons and a valence of 2?" I don't really understand the question, because oxygen would be the element with the 6 valence electrons, but wouldn't that mean that it has a valence of 6? Does ...

**math**

Sam is one-third as old as his brother. In six years Sam will be one-half as old. How old is Sam now?

**Maths**

How would you solve the equation: 15 = 2x + y

**Math - Transformations**

State the transformation for g(x) = -2 (2x - 4)³ - 1 Would it be a vertical stretch by a factor of 2 a reflection in the x-axis a horizontal stretch by a factor of 1/2 a translation 4 units right and 1 unit down Am i right?

**Math**

The function −2𝑓(2𝑥 + 4) − 1 has been transformed from the graph of 𝒇(𝒙) = 𝒙^𝟑 Write the equation for the transformed function.

**Even or Odd Funciton**

is f(x) = 1/(x^3 - 5x) even, odd or neither? i am thinking neither but im not too sure. cz when i sub in (-x) i get 1/((-x)^3-5(-x)) then i don't really know what this means.

**Math Please Help**

Simon travels north and south from Main Station. The distance, in km, of the train from Main Station is modeled by the function d(t)=t^3-9t^2+6t, where North is positive and South is negative. Time elapsed after the start of a shift, in hours, is represented by t, where &#...

**Math Please Help**

Sorry the Equation is d(t)=t^3-9t^2+6t

**Math Please Help**

Simon travels north and south from Main Station. The distance, in km, of the train from Main Station is modeled by the function 𝑑(𝑡) = 𝑡 3 − 9𝑡 2 + 6𝑡, where North is positive and South is negative. Time elapsed after the start of ...

**Math**

Can a polynomial function of an even degree be an even function? is this true all the time? Thank You!

**Math**

so if i found that the roots are -3 and 4 how would i write that? -3(order 2), 4 because at -3 the function acts like a quadratic but at 4 it acts linear.

**Math**

What does it mean when it says Roots (order) for a function eg. -x^3-2x^2+15x+36 What i mean is how do you the answer.

**math**

Ashley bought a circular rug for her room. the rug has a diameter of 9 feet. Her room is rectangular-shaped and measures 12 feet by 18 feet. about how much of Ashley's room will not be covered by the circular rug?

**Math**

I want to make quilt with an area of 42 sq.feet. what are its possible dimensions if they must be whole numbers? Please show his you got your answer

**Geometry**

3.4

**BIO PLEASE HELP!**

Identify the Protist and explain why you think it is what you said. We took dead leaves from outside, put them in boiling water then looked at them a week later. Link to image below! LINK: postimg. org/image/gu1201se9/ Ive attempted to look everywhere but i can't find a ...

**Math**

16/x

**Biology**

Identify the Protist and explain why you think it is what you said. We took dead leaves from outside, put them in boiling water then looked at them a week later. Link to image below! LINK: postimg. org/image/gu1201se9

**Biology**

Identify the Protist and explain why you think it is what you said. We took dead leaves from outside, put them in boiling water then looked at them a week later. Link to image below! LINK: postimg. org/image/gu1201se9/

**STATS**

What is the probability that the average salary of a sample of 49 part time bank teller will be less than $22,600?

**Math**

There are six true-false questions on a quiz. Not knowing any of the answers, a student guesses randomly. Find the probability of each event. Exactly two answers are correct. Exactly six answers are correct. At least five are correct. At least three answers are correct.

**Math -Trig**

Determine the exact value if cot(3pi/4) using special triangles. I don't understand how it could be 1/tan3pi/4 in a triangle....

**Math - Trig**

if the diameter of a tire is 3.5 m and makes one rotation every 5 seconds, how far does the tire rotates in one minute?

**Physics**

An 11.98-gram sample of zinc metal is placed in a hot water bath and warmed to 78.4°C. It is then removed and placed into a Styrofoam cup containing 50.0 mL of room temperature water (T=27.0°C; density = 1.00 g/mL). The water warms to a temperature of 28.1°C. ...

**Algebra**

Divide. (X^2+6x+9/x-1)/(x^2-9/x^2-2x+1) A. (X+3)(x-1)/(x-3) B. (X-3)(x+1)/(x+3) C. (X+3)(x+1)/(x-3)** D. (X-3)(x-1)/(x+3) Divide. (X^2-4/x-8)/x-2 A.(x-2)(x+2)/x-8 B. X-8/x+2** C. X-2/x-8 D. x+2/x-8

**Stat**

Does anyone know how to solve for this Suppose that a principal of a local high school tracks the number of minutes his students spend texting on a given school day. He finds that the distribution of minutes spent texting is roughly normal with a mean of 60 and a standard ...

**Math**

When measuring the volume of a tennis ball, your water level rose from 50ml to 68ml. What is the volume of the ball? I don't know if I divide or add to solve. Here is the choices. 118,108,18,8.

**Math**

Given that x=log3^5 and y=log3^2, rewrite log3^60 in terms of x and y.