# Posts by emma

Total # Posts: 1,777

**science**

The radius of the Earth is approximately 3,960 miles. Find the approximate surface-area-to-volume ratio of the Earth. A. 0.00025 B. 0.00076 C. 1,320 D. 11,880

**Calculus**

How would I use the chain rule here for x^2+y^2=z^2 but still have my answer in equation form?

**Calculus**

Find dy/dx by implicit differentiation: cos(x−y)=−4xe^x

**Calculus**

Find dy/dx by implicit differentiation for the following 2x^2y+3y=-1

**Calculus please help??**

The motion of a spring that is subject to dampening (such as a car's shock absorber)is often modeled by the product of an exponential function and a sine or cosine function. Suppose the equation of motion for a point on such a spring is s(t)=3∗e−2tsin(3ðt) ...

**math**

A small community college is hoping to raise enough funds to put together an endowment in which the scholarships will be paid for by only the interest earned from the endowment. Assuming they can earn an average of 7.50% for the APR and that only the interest would be spent ...

**math**

As you and your spouse are discussing your monthly budget at the dinner table one night, you are both curious as to how much of your $325 car payment is going to principal and how much to interest. Knowing that you are paying an APR of 3.75% to the bank and that you still owe...

**math!**

3. Suppose that Jill, at age 24, decides to invest $200 monthly into a portfolio that earns 7% compounded monthly and does this until she turns 34. At age 34 she stops contributing to her portfolio, and just lets it gain the same interest (7% compounded monthly) until she ...

**Citing**

I found it, if anyone else ever has this question it is Ibid.

**Citing**

Thank you.

**Citing**

In Chicago, when you are citing two things from the same source how do you cite it?

**English!**

The directions says "At least 10 supporting details go beyond Main Events" does that mean at least 10 facts altogether in the essay or 10 supporting details in each paragraph?

**math**

A search and rescue plane flying at an altitude of 1000 feet spots a ship in the ocean with an angle of depression of 7 degrees. The pilot follows his line of site and flies directly toward the boat for 0.7 miles. At this point his altitude is _____ feet. Use 1 mile = 5280 ...

**math**

A carpenter is adding a sun room to the back of a house. If the width of the room is 15 feet, the distance from the house to either obtuse corner of the room is 13 feet, and the distance from the house to the point of the room is 18 feet, then angle = _____degrees. Round to ...

**math**

A 45 foot long driveway goes uphill from the street to the garage of a house with a 5 degree angle of elevation. The garage must be _____ inches higher than the street. Round to the nearest whole number. (Watch the units!)

**math**

okay thanks!

**math**

A sector in a circle of radius 8.1 m has an area of 53.5 m^2. The central angle in a sector must be _____o. Round to one decimal place.

**math**

That makes sense. Thank you!

**math**

41 degrees, 20 minutes, 26 seconds - 23 degress, 39 minutes, 56 seconds = ?degrees, ?minutes, ?seconds

**math**

Okay I got it. Thank you!

**math**

If a room is 13 feet wide and 18 feet long, how many feet is it from one corner to the opposite corner? Round to one decimal place.

**math**

Thank you!

**math**

If an equilateral triangle has an altitude of 4.12 cm, how many cm long is one of its sides?

**math**

thanks!

**math**

thanks

**math**

I got circumference = 43.96. How would I find how many inches it travels from 1 to 4?

**math**

Inches, rounded to 2 decimal places.

**math**

It does not say.

**math**

If the hour hand of a clock is 7 inches long, how many inches does the tip travel between 1:00 PM and 4:00 PM?

**math**

Suppose you start saving today for a $30,000 down payment that you plan to make on a house in 8 years. Assume that you make no deposits into the account after the initial deposit. For the account described below, how much would you have to deposit now to reach you $30,000 goal...

**math**

You want to have $85,000 college fund in 15 years. HOw much will you have to deposit now under the scenario below. Assume that you make no deposits into the account after the initial deposit An APR of 4% compounded daily. You should invest?

**math**

you invest $4000 in an account that pays simple interest of 6% for 30 years. calculate the amount of money you'll have at the end of the indicated time period.

**math**

Assume you want to accumulate $125,000 for a long-range goal in 40 years. You have two choices. Plan A is an account with annual compounding and an APR of 5%. Plan B is an account with continuous compounding and an APR of 4.5%. How much of an investment does each plan require ...

**math**

You deposit $1200 in an account that pays an APR of 7% compounded monthly. How long will it take for your balance to reach $150,000?

**Economics**

I am having problems answering the question below can you please help? With probability p, you will catch a disease that reduces your income from y, its level when you are healthy, to y-k, where k > 0. A vaccine is available, at cost c, that reduces the probability of your ...

**math**

Suppose that you learn, prior to your trip to British Columbia, that gasoline will cost $1.50 (in Canadian dollars) for every liter you purchase. You know from checking the Internet that 1 liter is equivalent to 0.26 gallons and the currency conversion rate for the Canadian ...

**math**

Suppose that China’s population policy is modified so that every family could have children until either a boy is born or until a maximum of four children are born, whichever comes first. Assume that every family chooses to have as many children as possible under this ...

**math**

Suppose that you learn, prior to your trip to British Columbia, that gasoline will cost $1.50 (in Canadian dollars) for every liter you purchase. You know from checking the Internet that 1 liter is equivalent to 0.26 gallons and the currency conversion rate for the Canadian ...

**math**

Three boxes of fruit are labeled Apples, Oranges, and Apples and Oranges. Each label is wrong. By selecting just one fruit from just one box, how can you determine the correct labeling of the boxes?

**math**

Imagine that you have 5 blue socks and 5 brown socks in a drawer that are not paired up. How many socks must you take out from the drawer (without looking) to be sure of getting a pair of the same color? (3 points)

**math**

One of your dresser drawers contains 10 black socks and 10 blue socks. Suppose it is dark and you can’t tell what color a sock is when you look at it. If you start taking socks randomly one at a time from the drawer, how many would you have to take to guarantee that you ...

**math**

One of your dresser drawers contains 10 black socks and 10 blue socks. Suppose it is dark and you can’t tell what color a sock is when you look at it. If you start taking socks randomly one at a time from the drawer, how many would you have to take to guarantee that you ...

**math**

Assuming that a table saw blade has a diameter of 12 inches and spins at 3450 revolutions per minute (RPMs),determine how fast the tip of the teeth of the saw blade are traveling in miles per hour. Answer: 3450/12= 287.5 RPMs 287.5 min/60 mins = 1 hr =4.8 RP/HR

**math**

3450/12= 287.5 RPMs 287.5 min/60 mins = 1 hr =4.8 RPHR is that right then?

**math**

Assuming that a table saw blade has a diameter of 12 inches and spins at 3450 revolutions per minute (RPMs),determine how fast the tip of the teeth of the saw blade are traveling in miles per hour.

**math**

Assuming that a table saw blade has a diameter of 12 inches and spins at 3450 revolutions per minute (RPMs), use the unit conversion techniques you have learned from the material in 2-A to determine how fast the tip of the teeth of the saw blade are traveling in miles per hour.

**math**

Suppose you are turning in a receipt to your ward financial clerk for a reimbursement and unfortunately only the final amount of $57.93 is showing on the receipt. The ward clerk asks for your help to calculate how much went to state sales tax (which is currently 6%). How much ...

**math**

4. Suppose your living room is a rectangle measuring 13 feet by 21 feet and it needs new carpet. How much carpet do you need in square yards and how much would your cost be if it is sold at $21 per square yard? Round your first answer to the nearest square yard.

**Calculus**

find the equation of the tangent line to the graph of y= f(x) = ln (x)/x at the point (1,0)

**Biology**

YEP IT IS REAL HARD

**Algebra**

How do you factor ax^2+bx+c? I'm so confused. I remember my teacher saying to use the discriminant b^2-4ac but when I do find the answer what do I next? Please help! For ex. Factor the trinomial if possible. If it cannot be factored, write not factorable. 4x^2+27x+35

**Chemistry**

Calculate the pH for each of the following cases in the titration of 50.0 mL of 0.140 M HClO(aq) with 0.140 M KOH(aq).HClO is a weak acid with a Ka of 4.0× 10–8. It reacts with strong base to produce ClO–. (e) after addition of 60.0 mL of KOH

**science**

Calculate the heat of combustion of candle wax in kJ/mole. The standard heat of formation (∆Hf ) of candle wax (C20H42) is -2230 kJ/mole. The standard heat of formation (∆Hf ) of carbon dioxide is -394 kJ/mole. The standard heat of formation (∆Hf ) of water ...

**science**

what is the purpose of meiosis

**science**

what is the differnts between asexual and sexual reproduction

**Science**

I am doing a project on blizzards and I am having a hard time trying to find 3 good interactive websites. Help please? Thanks!

**English**

Good claim/topic sentence for this question? Did Miep Gies face many important challenges during and after the time of the holocaust?

**math**

what does the second term and the fourth term mean?

**Algebra**

Write the expression as a complex number in standard form. ____5____ 2- i =2+5i Did I get the right answer?

**Chemistry**

A solution is prepared by dissolving 0.12 mol of acetic acid and 0.12 mol of ammonium chloride in enough water to make 1.0 L of solution. Find the concentration of ammonia in the solution.

**Algebra**

Use a graphing calculator or a computer to graph the system of inequalities. Give the coordinates of each vertex of the solution region. 5x-3y is greater than or equal to -7 x-2y is greater than or equal to 3 3x+y is greater than or equal to 9 x+5y is less than or equal to 7 I...

**Chemistry**

A solution is prepared by dissolving 0.12 mol of acetic acid and 0.12 mol of ammonium chloride in enough water to make 1.0 L of solution. Find the concentration of ammonia in the solution.

**Geomatry**

If a zipline ends at 8ft above the ground and goes upward at a 6 degree angle, how high will it begin?

**Chemistry**

What volume of a 15.0% by mass NaOH solution, which has a density of 1.116 g/mL, should be used to make 4.40 L of an NaOH solution with a pH of 10.5?

**English**

In English, we're learning about the Holocaust and we are answering to "related-to-your-life" questions and below are some questions that I do not understand. Please help! Thank you. Does the U.S. control any countries? Do we have a Chancellor of the US? Who ...

**ACT Explore**

I'm taking the ACT explore tomorrow and I was wondering if there is a writing portion

**Algebra**

Tell whether the graph opens up or down. Find the coordinates of the vertex. Write an equation of the axis of symmetry. Y=3x^2 The graph opens up but I don't get how you would find the coordinates of vertex and how to write the equation of axis of symmetry. Please help!

**Social Studies**

I just took the quiz! (100% correct) 1.) B 2.) B 3.) D

**English**

What is a good topic sentence for an essay about eating insects? *The article (source where I got the info from) was about insect eating and if more countries should try to consume it.

**Physics**

A 4kg mass is pushed with a constant force for 1m then off the edge of the table and lands 7m from the edge of the table. a) What was the force pushing on the mass? b) What is the resultant velocity?

**Math**

Adam uses 1/6,1/3and 2/5 to make a circle graph an colored each a different color. What fraction of the graph is not colored? Explain your answer.

**Application/Writing Sample**

When an application asks for a writing sample, is it a good idea to give them a reflection on a poem?

**geometry**

i guess your right though...:|

**geometry**

i know but it changes from miles to feet and the amount of feet is not enough to be one mile!!!

**geometry**

this rectangular prism is 120 miles in length, 20 miles in width, and 800 feet deep what is the volume????!!?

**Math**

Wirte an exponential growth model. 22. A business had a $20,000 profit in 1990. Then the profit increased by 20% per year for the next 10 years. y=c(1+r)^t y=20,000(1+0.2)^10 Is that correct?

**math**

You divide each side by 12 32/12 = ? therefore, x= ?

**math**

Yes you are correct.

**math**

A=LW 3/4=L5/4 Times each side by 4/5 3/4 times 4/5 =? therefore, L= ?

**Algebra**

Use a calculator to evaluate the expression. Write the result in scientific notation and in decimal form. Did I do think correctly? 6000000 * 324,000 =1.944*10^12 =1944000000000

**Chemistry**

At the temperature of 30degree C and pressure of 1*10^5 pa, 30dm3 of H2 gas is burned with 30dm3 of O2 gas in a container of 60dm3. Calculate the pressure different after the complete combustion and cooling upto 30degree C again.

**Calculus**

F'(x)=

**Calculus**

Use logarithmic differentiation: F(x)= (3x+6)^4 (x^3 -2)^5

**Chemistry**

NH4NO3 is frequently used as a fertilizer and in explosive compounds dlta Hf values of this compound nd H20 are -365kJmol-1 and -286kJmol-1 respectively. Calculate the amount of heat released bye the dissociation of 1mol of NH4NO3 according to the following reaction 2NH4NO3--&...

**Chemistry**

20cm3 of 0.500moldm-3 H2SO4 was consumed to neutralize 50cm3 of 0.400moldm-3 NaOH. The temperature of the system is increased by 36 degree C. The heat capacity of the calorie meter was 39 JK-1, and the heat capacityof the solution is 4.2JK-1. Find the enthalpy of ...

**Chemistry**

20cm3 of 0.500moldm-3 H2SO4 was consumed to neutralize 50cm3 of 0.400moldm-3 NaOH. The temperature of the system is increased by 36 degree C. The heat capacity of the calorie meter was 39 JK-1, and the heat capacityof the solution is 4.2JK-1. Find the enthalpy of ...

**Chemistry**

20cm3 of 0.500moldm-3 H2SO4 was consumed to neutralize 50cm3 of 0.400moldm-3 NaOH. The temperature of the system is increased by 36 degree C. The heat capacity of the calorie meter was 39 JK-1, and the heat capacity of the solution is 4.2JK-1. Find the enthalpy of ...

**physics**

Cliﬀ divers at Acapulco jump into the sea from a cliﬀ 37.1 m high. At the level of the sea, a rock sticks out a horizontal distance of13.39 m. The acceleration of gravity is 9.8 m/s^2. With what minimum horizontal velocity must the cliﬀ divers leave the ...

**physics**

Bill kicks a rock oﬀ the top of his apartment building. It strikes a window across the street 12 m away. The acceleration of gravity is 9.8 m/s^2. If the window is 16 m below the position where Bill contacted the rock, how long was it in the air?

**Math!!!!!!!!!!!!!!!!!**

OMG please help me .-. (Advanced) Give the domain and range of the relation. x y 2 5 8 17 0 0 –3 –5 Answer a. D: {2, 8, –3, 5, 17, –5}; R: {0} b. D: {–3, 0, 2, 8}; R: {–5, 0, 5, 17} c. D: {–3, 2, 8}; R: {–5, 5, 17} d. D: {–5, 0, 5, ...

**math**

I need help please >(Advanced) Give the domain and range of the relation. x y 2 5 8 17 0 0 –3 –5 Answer a. D: {2, 8, –3, 5, 17, –5}; R: {0} b. D: {–3, 0, 2, 8}; R: {–5, 0, 5, 17} c. D: {–3, 2, 8}; R: {–5, 5, 17} d. D: {–5, 0, 5, ...

**Chemistry**

you would have to use addition. and convert it into a fraction.

**Chemistry**

A solution contains a mixture of pentane and hexane at room temperature. The solution has a vapor pressure of 235 torr. Pure pentane and hexane have vapor pressures of 425 torr and 151 torr, respectively, at room temperature. What is the mole fraction composition of the mixture?

**English**

Is this grammatically correct? "I can't believe that I'm growing up so fast."

**Math**

300 feet

**Algebra**

Simplify : ((-5xy)^2)^5 I got 9765625x^10y^10 I don't that is correct..

**ELAPSED TIME**

9 hours and 40 minutes

**Physics**

Small spheres of diameter 1.00mm fall through 20 degree Celsius water at a terminal speed of 1.10 cm/s. calculate the density of the spheres.

**History**

"They [Jackson and his supporters] see nothing wrong in the rule that to the victor belong the spoils of the enemy." -William Learned Marcy of the U.S. Senate What did Marcy mean by the "spoils of the enemy"?

**math**

:D