# Posts by leon

Total # Posts: 72

**Help Please. Math**

By comparing the amount of carbon-14 to amount of carbon-12, one can determine approx how long ago the organism died. The half-life of carbon-14 is 5730 years. Assume the initial quantity of carbon-14 is 600 milligrams. the equation is A (t)=600*(.5)^(t) (0,600) (1,300) (2,150...

**Chemistry**

When iron metal reacts with oxygen, the reaction can form Fe2o3 (numbers are subscripts). Write a balanced chemical equation for this reaction and find the number of moles of oxygen that are needed to form 6 mol of Fe2o3. Show your work. I am really stuck and I don't know ...

**Physical Science **

What are the products of a double replacement reaction between potassium bromide and silver nitrate? Name the resulting compounds.

**Math**

Raj gets a 1.5 mile head start and runs at a rate of 4.5 miles per hour. Jacinda's progress is represented by a graph that goes through the points (1,10), (2,20), and (3,30). How long will Jacinda need to run to catch up with Raj?

**Algebra**

Raj gets a 1.5 mile head start and runs at a rate of 4.5 miles per hour. Jacinda's progress is represented by a graph that goes through the points (1,10), (2,20), and (3,30). How long will Jacinda need to run to catch up with Raj?

**American Government**

regardless of if its A, C or D the answers for 2 are interpreting the rules for the house and naming representatives to committees seriously guys, they change the order to the answers. you can't just say its ABCDEFG or whatever you have to state what the actual answers say...

**science**

The half-life of carbon-14 is 5730 years. If we start with 10 grams of carbon-14, after 5730 years, we will have _____ of carbon-14 left.

**science**

Which rate constant would result in the fastest reaction? Which rate constant would result in the fastest reaction? 1 1.3 × 103 L/mol · s 2 2.8 L/mol · s 3 9.5 × 10-2 L/mol · s 4 4.2 × 10-3 L/mol · s

**science**

A graph of experimental data is a straight line when ln[H2] is plotted versus time. Which rate law fits the data? 1 Rate = k(ln[H2]) 2 Rate = k/[H2] 3 Rate = k[H2] 4 Rate = k[H2]2

**science**

The half-life of carbon-14 is 5730 years. If we start with 10 grams of carbon-14, after 5730 years, we will have _____ of carbon-14 left.

**life orientation**

This can separate the relationship between b.s.a and lead To conflict

**physics**

thank you 2.95 kg 1240 J 77.5 J

**physics**

A boulder flies through the air at 14.5 m/s with kinetic energy 310 J. What's its mass? What's the boulder's kinetic energy if its speed doubles? What's the boulder's kinetic energy if its speed is halved?

**Calculous**

Thank you!!

**Calculous**

Without using a calculator, find the sum of the series. Pretend in place of E is Greek Letter Sigma. 27 E(4 + 1/2n) = ? N=0

**Sequences**

An arithmetic sequence has first term of 6 and difference of 8; what is the tenth term? a10(subscript 10) = ?

**Econ**

The 1-year interest rate on Swiss francs is 5 percent and the dollar interest rate is 8 percent. (A) if the current $/SF spot rate is $0.60, what would you expect the spot rate to be in 1 year. (B) Suppose US policy changes and leads to an expected future spot rate of $0.63. ...

**L.Arts**

Greedy raisin, the does f.u.c.k that mean

**Math**

g(x) = (1-x)(4+6x) / (5x^2+4) Horizontal asymptote y = ?

**Basic programming principles**

What would be the answer of the following: (only type in your answer at the answer space provided) Result a = 5 b = 7 Answer = 15 Do while answer <= 47 Answer = answer + a – b a = a + 6 b = b – 1 loop end

**Basic programming principles**

The user wants to display a message a fixed number of times, if you know the message and the number of times (number) it must be displayed what would be the for statement, will this be correct or incorrect ONLY indicate correct or incorrect at your answer space. for i = 1 to ...

**Basic programming principles**

The for next statement is used to display the consecutive numbers from 1 to 10K = 1 For I = 1 to 10 Display k, “ “K = k + 1 Next I The output will be 10 9 8 7 6 5 4 3 2 1 Will the above statement output be correct or incorrect

**Basic programming principles**

If the value of K is equal to 6, increase the value of A by 5%, if the value of K is equal to 4, decrease the value of A by 8, if the value of K is equal to 7, add the value of B to the value of A, otherwise decrease the value of A by 12%Will the following statement be correct...

**Basic programming principles**

Piet earns R20 per hour, if he works more than 30 hours then he receives an extra R8 per hour, will the following statement be correct or incorrect (only type in correct or incorrect at your answer space)If hoursworked > 30 then Salary = salary + (hoursworked – 30) + 8

**Science**

So is 7 C?

**Science**

5.The process of desertification can occur when B.farmers use contour farming techniques C.an area of forest is clear-cut D.an area of forest is selectively cut 7.Which of the following statements describes the conservation of a natural resource? A.A factory burns coal to run ...

**Help with science**

So then is 7 C?

**5th grade math**

I'm sorry its 4 nickels, not 5 nickels. Can you check my answer again..thanks

**5th grade math**

What fraction of a dollar is shown by coins (2 quarters, 1 dime, and 5 nickels)? I got 80/100 equals 8/10. Is 8/10 the correct answer? If not can you show me how to get the right answer?

**math**

If abdul runs 6 miles in 50 minutes. At the same rate, how many miles would he run in 35 minutes?

**math**

A side of an equalateral triangle is 2/8 cm long. Draw a picture that shows the triangle. What is the perimeter of the triangle?

**History**

you guys are just a peacie of it spam omg you guys can get sewed and everything .l.

**Math**

Sam has a total of 200 dimes and quarters. If the total value of the coins is $28.10, how many quarters does he have?

**statistic**

I claim that I make 80% of my basketball free throws. To test my claim, you ask me to shoot 20 free throws. I make only 8 of the 20. “Aha!” you say. “Someone who makes 80% of her free throws would almost never make only 8 out of 20. So I don’t believe your...

**math**

write an equation in words and in symbols to represent this situation: Grace has $100.She is buying charms for her bracelet that cost $5 each.Write an equation showing the relationship between the number of charms (c)she buys and the amount of money she has left (l)<----...

**physics**

A mass m1 = 6.0 kg sits on a frictionless table, and rotates at a constant speed v = 3.0 m/sin a circle of radius R = 1.5 m. m1 is attached by a massless string which passes through a hole in the centre of the table to a second m2 (which hangs freely without moving). There is ...

**Chemistry**

If 2 grams of acetic acid is reacted with excess 1-pentanol, what mass of pentyl acetate would you expect to achieve theoretically?

**INTRODUCTION TO THE SHORT STORY, PART 1**

hes right

**Statistics**

For each of the following (a) indicate how many factors are included, and (b) tell how many levels there are for each factor: a) 2x2 b) 2x3 c) 2x3x2 d) 4x3 e) 4x3x2x3

**tusd**

last year, the sports athelitic club charges 20.00 per class. 70 people attended. The club wants to increase the class price. the club expects to lose one customer for each $1.00 increase. a. what should the new price be to maximize the income? b. what is the maximum income ...

**English**

My parents remind us to be good people.

**Maths**

triangle ABC is right angled at A. AD is perpendicularto BC. If AB= 5cm,BC= 13cm and AC=12 cm.find the area of triangle ABC. Also find the length of AD.

**history**

i like to eat food

**history**

Yes.

**3rd Grade Math**

@ missy ; the same

**Math Grade 3**

amount of carbhohydrates = 27 amount of calories = 121 amunt of calorie sourses other than carbhohydrates =121 - 27 =94

**java programing**

Write a program that evaluates the volume and surface area of a sphere of radius 11.2cm.

**java programing**

If you were writing a program application that was harvesting people's emails and telephone numbers, explain and demonstrate how you would validate the individual emails and telephone numbers! That is to make sure all the emails and telephones you got were valid.

**java programing**

Write a program that evaluates the volume and surface area of a sphere of radius 11.2cm.

**calculus**

sum (n*2^n)/(2^n +3^n) [n to infinity] conv or div ? and how to get that? thank you!

**calculus**

The parametric curve x(t)=3cos(t) y(t)=7sin(2t) intersects itself at a point P=(x0,y0) where x0= y0= The slopes of the 2 tangents at this point are? THANK YOU!

**percentage**

you have 50 students one day and 70 the next what is the percentage increase

**math calculus**

Use implicit differentiation to find the equation of the tangent line to the curve xy^3+2xy=9 at the point (31). The equation of this tangent line can be written in the form y=mx+b where m is

**phys**

The space shuttle, with an initial mass M = 2.41E+6 kg, is launched from the surface of the earth with an initial net acceleration a = 26.1 m/s2. The rate of fuel consumption is R = 6.90E+3 kg/s. The shuttle reaches outer space with a velocity of vo = 4632 m/s, and a mass of ...

**Economics**

Ashley is currently consuming 10 hot dogs and 8 hamburgers a week. The last hot dog she consumed yielded 20utils while the last hamburger she ate gave her 25utils. If hot dogs cost $2 and hamburgers cost $2.50, is Ashley consuming the correct quantities of these two goods to ...

**PHYS**

A bungee jumper (m = 61.00 kg) tied to a 45.00 m cord, leaps off a 75.00 m tall bridge. He falls to 5.00 m above the water before the bungee cord pulls him back up. What is the magnitude of the impulse exerted on the bungee jumper as the cord stretches? Can anyone show me how ...

**Chem**

In the |Molecular Geometry Lab 1. List three ways in which models used in this experiment are inaccurate representations of orbitals? 2.explain why the ClF3 molecule is not a trigonal planar molecule?

**4th grade**

explain the expanded algorithm for 92x5

**LINEAR ALGEBRA**

How to prove or disprove (a)if A has a zeronentryonthe diagonal then A is not invertible (b)if Ais not invertible then for every matrix B, AB is not invertible (c)if A is a nonzero 2X2 matrix such that A^2+A=0, then A is invertible

**pre-algebra**

-W

**chem**

1. what is the quantum numbers of the last electron of Sb?(n= l= ml= ms=) and why the answer are this number? 2.how many electrons would be found in the n=6 level if all possible orbitals were completely filled with electrons? how to calculate this one? Thank you~

**chemistry**

For a TLC lab,the stationary phase is the mixture of isopropanol and ammonia or the mixture of hexane,ethyl acetate and ethanol, the stationary phase is silica gel. text some dyes and drugs. which one of the two mobile phases is the more polar? Actualy I need two pieces of ...

**chemistry**

Also, for the same situation, which one of the two mobile phases is the more polar? Actualy I need two pieces of evidence... I think the polar one should be the isopropanol and ammonia because it moves slower. Can you help me come up another reason? Thank you~

**chemistry**

For a TLC lab,the stationary phase is the mixture of isopropanol and ammonia or the mixture of hexane,ethyl acetate and ethanol, the stationary phase is silica gel. text some dyes and drugs. what is the relationship between the polarity of molecules and the Rf values?

**chemistry**

it is 0.1M of acetic buffer equal to sum up of 0.05M of acetic acid and 0.05M of sodium acetic ?

**nutrition**

o What are some current nutritional issues, such as obesity or malnutrition for infants

**Finance**

if the price of milk has quadrupled (that is, grown four times) over the past 25 years, what has been the annual rate of inflation in milk price over that time period?

**Finance**

if the price of milk has quadrupled (that is, grown four times) over the past 25 years, what has been the annual rate of inflation in milk price over that time period?

**Physics**

Consider a simple alternating current generator such as Hippolyte Pixii's dynamo. The current generated by such dynamo can be described as simple oscillating cosine signal. Assuming for simplicity that the max current generated each time a pole of Pixii's magnet passed...

**Global : Columbus**

Thanks, I truly believe he is a villian for what he had done to those poor innocent people. By stealing their crops, cloths, land, and making them slaves. But I know that someone had discovered the Natives before Columbus I just don't know who...... all I know is that he ...

**Global : Columbus**

1) Why do you think Christopher Columbus is a villian? 2) Who discovered America before Columbus?

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