# Posts by Greg

Total # Posts: 490

**science**

The light from the Sun heats a metal surface. This is an example of A. conduction. B. radiation. C. convection. D. reflection.

**Calculus**

A rectangular box with a square base and cover is to have a volume of 2500 cubic feet. If the cost per square foot for the bottom is $2, for the top is $3, and for the sides is $1, what should the dimensions be in order to minimize the cost?

**Essay**

13 years?

**math **

1.-3(n+5)=12 2.46=-6t-8

**Science**

Oh Ok thanks

**Science**

How would you experiment to find out how much this plant type needs for optimal growth? I am not sure how to answer this question.

**greg**

MY NAME IS JEFF!

**Physics**

The density of the dead sea is 1.24x10^3 kg m^-3. A wooden board with an area of 2.5m^2 is dropped in the Dead Sea. Calculate the proportion that would float above the surface. Density of wood= 800kg m^-3

**math**

Hi I wanted to check my work for this problem. Consider the points A(1,0,0) B(2,2,2) and C(0,2,1). 1) Find the vector CA x CB I got -2i -3j +4k for this 2) Find an exact value for the area of the triangle ABC. I got sqrt29/2 for this. 3) Plane II(1) is 2x+3y-4z=2. A second ...

**math**

Hi, I was working on my math homework and I was stumbling on these problems. I wanted to double check my answers that I have; I also could not answer 5. If vectors O(0,0,0), A(6,0,0), B(6,-sqrt(24), sqrt(12)), and C(0,-sqrt(24), sqrt(12)) form a square. 1) Find a vector ...

**Chemistry**

is the flame coloration a test for the metal or for the acid radical?

**vector calculus**

Hi, I'm having trouble answering this question. The lines l1 and l2 are defined as l1: (x-1)/3 = (y-5)/2 = (z-12)/-2 l2: (x-1)/8 = (y-5)/11 = (z-12)/6 The plane j contains both l1 and l2. Find the Cartesian equation of j.

**Math 11**

write the equation in vertex form, of a parabola with vertex (5, -1) and that passes through the point (6, 8)

**Algebra**

3a + 6 write a situation that could be represented by the Expression

**Math**

Katie is baking cookies. She only wants to make 3/4 of the recipe. She needs to take 3/4 of the 2/3 cup of sugar. How much sugar does she need?

**Math**

Henry needs to cut a 4 2/3 foot board into 5 equal pieces. How long was each piece?

**6th**

Approximately 2% percent of the people in the world have red hair. There are about 7,000,000, people in the world.About how many people have red hair?

**stats**

fu

**algebra**

A man has two investments. The first pays him 3% interest per year and the other, 4%. The total income from these two investments is $170. If the interest rates were interchanged, the yearly income would be $180. How much is the investment?

**Ap physics**

Fg=Fc GMm/r^2 =m4pi^2R/T^2 Therefore M=4pi^2R^3/GT^2 =6.0x10^24kg Note: r = radius of moon orbit, T =27 days approx

**Physics**

Your answer is correct, but the net force of an orbiting object is not zero. Objects in circular motion have a net force that points to the center of the circle that generates the centripetal force

**Amercian Government**

Becky what were the answers to the lesson 14 unit test for American government ?

**Chemistry**

What volume of (2.5M) Hydrochloric Acid will be needed to neutralize 359mL of a 1.50M solution of potassium hydroxide?

**Math**

2+3 add each number to itself plus one

**Math**

How many 3/8 foot pieces of wood can you cut from a board that is 1 7/8 feet long?

**math**

no row or column contains products with only odd numbers , do you agree?

**Chemisty**

Combustion of hydrogen sulphide with oxygen in kmol H2S +O2 = H2O + SO2 can somebody balance this for me and break it down to the atomic mass.

**Chemisty**

Combustion of hydrogen sulphide with oxygen in kmol H2S +O2 = H2O + SO2 can somebody balance this for me and break it down to the atomic mass.

**Math**

An object is projected directly upward from the ground. Its distance in feet from the ground in t seconds is s equals s=112t−16t^2 The object will be 160 feet from the ground after () second(s) and after () second(s). The object strikes the ground after...

**math**

sonya spent 3/8 of her money and had $15 left. how much money did she orginally start with?

**math**

4/12

**Math**

john has 28 marbles and sue had 157 marbles, after each added the same amount, sue had 4 times more than john. how many did they each add?

**Math**

A seed company claims that 90% of its bean seeds will germinate. If seven of these seeds are planted in warm, moist, soil, what is the probability that exactly 6 of them will germinate? Round answer to nearest ten-thousandth (4 places after decimal)

**Math**

The Washingtons buy a $260,000 home by putting 20% down and financing the balance with a 30-year fixed-rate 4.2% mortgage, compounded monthly. What is the amount of their monthly loan payment to amortize the loan?

**Math**

If a baseball player has a batting average of 0.420, what is the probability that the player will get at least 2 hits in the next four times at bat?

**Math**

Find the probability of the independent event. If P (E) = 0.9, P (F ∣ E) = 0.36, and E and F are independent, find P (F).

**3rd grade math**

HAHA oops wrong way :) 40>35

**3rd grade math**

Area : 8 x 5 = 40 square feet 35>40; yes he has enough

**Math**

3 x 2/1 (the reciporical of 1/2) = 6 6 days

**Math**

A rectangular swimming pool is bordered by a concrete patio. The width of the patio is the same on every side. The area of the surface of the pool is equal to the area of the patio. What is the width of the patio? (Length of Pool: 24 Width of Pool: 16)

**Math**

Find the solution to the system of equations by substitution. 2x+5y=8 and 6x+y=10 Would the answer be (1.5,1)?

**Statistics**

A study was conducted to investigate the relationship between the resale price, y (in hundreds of dollars), and the age, x (in years), of midsize luxury American automobiles. The equation of the line of best fit was determined below. y = 179.3 − 20.78x (a) Find the ...

**Math**

Solve the sytem of equations using the addition method. 5x+2y=1, x-3y=7

**math**

The MAthematical model C=500x+80,000 represents the cost in dollars a company has in manufacturing x items during a month. How many items were produced if costs reached $250,000? I'm so stumped I don't even know where to start.

**Vocab**

Big is large

**physics**

An electrical device contains a transformer. Its primary coil has 200 turns, and its secondary coil has 20 turns. If the device is plugged into a 120-volt line, what is the output voltage of the device?

**Chemistry**

0.5

**Physical Chemistry**

Im confused with the content

**Algebra**

In 2009, a diabetic express company charged $39.95 for a vial of type A insulin and $30.34 for a vial of type B insulin. If a total of $2022.21 was collected for 60 vials of insulin, how many vials of each type were sold?

**chemistry**

To what volume should you dilute 47.0 mL of a 5.95 M KI solution so that 27.5 mL of the diluted solution contains 3.50 g of KI?

**History**

Which of the following best explains why trade among the colonies flourished? The different regions specialized in different crops. The colonies had developed large fleets of trading ships. Existing trade routes were well-maintained by Native Americans. Colonies were founded ...

**History**

Which answer best expresses some of the issues related to economics that are listed in the Declaration of Independence? Cutting off trade and imposing taxes on the colonists are unfair practices. Denying the colonists trial by jury and sending them to Britain to face trial are...

**Calculus**

Using a graphing calculator and the concept of differentials determine the values for x when 1/(1+3x)^5 is approx = to (1-15x) within .01

**algebra**

you need to know the percentage of growth per year in order to be able to answer this question, because the final number depends on that percentage but for example, let's say it is 5% 2012 - 1993 = 19 years therefore, the formula would be (in millions) 171 * (1.05^19) = ...

**stats**

Find the probability of at least 2 girls in 10 births. Assume that male and female births are equally likely and that the births are independent events.

**statistics**

In a certain lottery, five different numbers between 1 and 31 inclusive are drawn. These are the winning numbers. To win the lottery, a person must select the correct 5 numbers in the same exact order in which they were drawn. What is the probability of winning?

**chemistry**

If four grams of Oxygen and four grams of Helium are placed in a five liter vessel at 338 K, what will be the partial pressure of each gas and the total pressure in the vessel?

**Chemistry**

Given that the initial rate constant is 0.0190s^-1 at an initial temperature of 20 degrees Celsius, what would the rate constant be at a temperature of 170 degrees Celsius? Activation energy is 32.4kJ/mol

**algebra**

A math class has a total of 47 students. the number of females is 17 less than the numberof males. how many males and how many females are in class?

**Math**

Find the adjusted balance due at maturity for a 90 day note of $15000 at 13.7% ordinary interest if a partial payment of $4000 is made on the 60th day of the loan.

**Math**

How do I find the exact interest on a loan for $3000 with a simple interest annual interest rate of 15% that was made on June 11 and was due on August 11.

**chemistry**

I don't understand...

**chemistry**

How do i convert mols cacl2 to agcl

**chemistry**

What mass of precipitate is formed when 0.750 L of 2.50 mol/L CaCl2 reacts with 650 mL of 1.75 mol/L AgNO3

**Chemistry**

Find the molar concentration of 57.9 g of potassiuum chlorate dissolved in 975 mL of water my work c=nv (57.9/122.55)(975ml) and i got 460 is this correct

**Math**

It appears Sir John did not answer the question (nine different answers) so if everyone knew their spouse, the answers were 0, 1, 2, 3, 4, 5, 6, 7, and 8. Since there is no indication of who knew whom, Sir John's wife could be any of 0 through 8. There were 36 handshakes ...

**Physics**

An auditorium has dimensions 10m x 10m x 60m. How many moles of air fill this volume at STP? I'm stumped.

**math**

The correct answer is: Assuming both pizzas are equal diameter, thickness and weight (which is virtually impossible, but for sake of argument...) IT IS IMPOSSIBLE THAT MARTY ATE MORE PIZZA THAN LUIS. However, if Marty's pizza was LARGER than Luis's pizza by a ...

**Math**

do you borrow his bike for a total of 41 minutes.before lunch,he vote for one minute less than five times the number of minutes he rolled after lunch. how many minutes did you fire ride before lunch

**Chemistry 111**

Gaseous ethane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . Suppose 17. g of ethane is mixed with 107. g of oxygen. Calculate the minimum mass of ethane that could be left over by the chemical reaction. Be sure your answer has the ...

**geometry**

That's so helpful idiot Reiny

**Physics College**

What is the rate of deceleration of a 1400-kg SUV that is going 75.0 km/h and then slows to 25.0 km/h in 8.20 s?

**algebra**

the sum of to kim and tony's ages is 42, the difference in their ages is 4 years. what are the ages of kim and tony?

**Biology**

Is respiratory control sensitive to small changes in arterial PO2 or in arterial PCO2?

**Physics Electricity and Magnetism**

A microscopic droplet of ink in an ink-jet printer is deflected onto the paper by a force of 2.34×10-4 N. If the field causing the deflection is 6.62 kN/C, what is the charge on the droplet? What equation do I use to solve and What does each value mean in the equation? ...

**calculus**

a small business owner buys a truck for $20,000 to transport supplies for her business. She anticipates that she will use the truck for 5 years and that the truck will be worth $10,000 in 5 years. She plans to claim a depreciation tax credit using the straight-line ...

**Physics**

How long will it take the voltage across the capacitor in an RC circuit to discharge 75% of its initial charged voltage if the resistor has a resistance of 450 kilo-Ohms and the capacitor has a capacitance of 49 micro-farads? How do I solve this problem? Thanks!

**Math**

When you use a coupon for 15 percent off the original price of a headset, you pay $27. What is the original price of the headset? Please use an equation.

**Chemistry**

Consider the following reaction: CaCO3(s)→CaO(s)+CO2(g). Estimate ΔG∘ for this reaction at each of the following temperatures. (Assume that ΔH∘ and ΔS∘ do not change too much within the given temperature range.) A) 310K B) 1070K C) 1470K ...

**math**

A truck has 5.9L engine in it. 5.9L of the overall displacement in 6 cylinders each 102mm bore (diameter) and 120mm stroke (length). Engine operates at 16.3:1 compression ratio and with 6psi (0.41atm) of boost cruising at 1600rpm. What is the volume of ONE cylinder? Then add 6...

**Chemistry**

Having trouble with this question on my homework =/ 200mL of 0.5M H2SO4 is combined with 500mL of 0.1M NaHCO3. List the physical states of all products, give molarity of aqueous ions and grams of gases and solids. Thanks alot guys!! Any help is awesome

**Chemistry**

Calculate empirical formula C=41.7%,H=6.2%,N=19.3%, and O=33.1% Thanks. any help at all will be awesome!

**Math Accounting**

Determine the proposal’s appropriateness and economic viability. For all scenarios, assume spending occurs on the first day of each year and benefits or savings occurs on the last day. Assume the discount rate or weighted average cost of capital is 10%. Ignore taxes and ...

**math**

In right triangle, the side opposite to right angle is called what? ANSWER FAST PLZ!!! THX

**alg 2**

1670 YAAAAAAAAAAAAAAAAAAAAAAAAAAAAY I GOT IT

**TRIG help quickly please**

Mark any solutions to the equation 2cos2x - 1 = 0. The answer can be more than one. Thank you π/8 -7π/4 15π/4 3π/4

**Science check answers please and quickly**

1. Jim is doing a physics experiment on the rate of cooling of solid objects in air. Which of the following is a variable that is not directly part of his experiment, but should be controlled in his experiment? (Points : 1) initial temperature to which he heats the solid ...

**Check Answers Quick -Physics**

What causes the centripetal acceleration of an electron in a hydrogen atom? electrical attraction gravity friction <-- tension Question 2. Which of the following terms might a jet pilot use to describe a force that presses him against his seat during a high-speed turn? ...

**pyhsis**

It is spelled physic

**Reading please please help**

Potatoes are good

**A/P Biology**

The Echinopsis mamillosa is a flowering cactus native to Bolivia. A high-rise building is built near a particular Echinopsis, filtering the amount of direct sunlight it receives. Which of the following processes is negatively affected first by the reduction in sunlight? ...

**Math 8th grade**

Type the missing number. -25 -23 -22 -21

**geometry**

4

**math - calc**

A conical water tank with vertex down has a radius of 12 feet at the top and is 26 feet high. If water flows into the tank at a rate of 30 {\rm ft}^3{\rm /min}, how fast is the depth of the water increasing when the water is 12 feet deep?

**math - calc**

A conical water tank with vertex down has a radius of 12 feet at the top and is 26 feet high. If water flows into the tank at a rate of 30 {\rm ft}^3{\rm /min}, how fast is the depth of the water increasing when the water is 12 feet deep?

**chemistry science**

substrate concentration= 3.5mM (c2) buffer=0.4 ml 10mM PNPP stock= ?ml (V1) water=?ml enzyme= 0.2ml total volume =1ml (V2) I need help with a dilution, I understand that you would be using c1v1=c2v2 but im confused as to what we need to find the amount of water and PNPP stock ...

**biochemistry**

substrate concentration= 3.5mM (c2) buffer=0.4 ml 10mM PNPP stock= ?ml (V1) water=?ml enzyme= 0.2ml total volume =1ml (V2) I need help with a dilution, I understand that you would be using c1v1=c2v2 but im confused as to what we need to find the amount of water and PNPP stock ...

**Math- factoring**

Show all work and factor completely. 6a^2+5a-4 (6a^2+8a)-(3a-4) 2a(3a+4)-1(3a+4) (3a+4)(2a+1) Is this correct?

**Math**

The Empire Carpet Company orders merchandise for $17,700, including $550 in shipping charges, from Mohawk Carpet Mills on May 4. Carpets valued at $1,390 will be returned because they are damaged. The terms of sale are 2/10, n30 ROG. The shipment arrives on May 26 and Empire ...

**math**

if a plane is traveling at an altitude of 11.9 miles and is 46 miles from the airport and is descending at a 12 degree angle, what is the mph to the airport?