# Posts by David

Total # Posts: 2,325

**Chemistry**

Oh thank you!

**Chemistry**

so did I do it right?

**Chemistry**

A graduated cylinder massed at 34.56g and then 8.6 ml was added of an unkonwn liquid this brought the mass to 45.87g. What is the density? I'm not sure how to go about this. Is the 34.56g unneccessary information? Or, do you subtract 45.87-34.56= 11.31 then do mass 11.31/...

**medical terminology**

which of the following is an example of a symptom?

**science**

microscope lens used to locate the specimen

**Biology**

not helping !

**Biology**

Eggs of Amphioxus is : (a)alecithal (b)telolecithal (c)meiolecithal (d)mesolecithal is it A ?

**Biology**

Human cell

**Chemistry**

the water will freeze

**Algebra**

A certain can of iced tea contains 4% of the recommended daily allowance of sodium. The recommended daily allowance is 2500 milligrams. How many milligrams of sodium are in the can of iced tea?

**10th grade**

A rational number is ____ a real number. a. always b. never c. sometimes its always ???????

**personal finance concepts**

Donna and Sherman Terrel are preparing a budget for 2010. Donna is a systems analyst with an airplane manufacturer, and Sherman is working on a master's degree in educational psychology. The Terrels do not have any children or other dependents. Donna estimates her salary ...

**Math**

Hi - there are any number of them, but they're all infinite series: if you go to Wikipedia and look up "pi", you'll find at least fifteen of them in the "Computation in the Computer Age" section of that entry.

**criminal justice**

Follow Bob Pursley's link on the difference between Morals and Ethics in his response to "Ilisa" a little further down this list: it'll give you some help in at least defining the problem, if not some help answering it.

**Statistics**

a - either you've just seen something that's phenomenally unlikely, or the coin's owner isn't being truthful about the fairness of the coin. b - you've just seen something that's consistent with the coin's owner's pronouncement that the coin is ...

**Statistics**

The first thing you need is a random selection of graduates whose salaries can be compared... and that's probably the trickiest bit, because getting a genuinely random selection of graduates could more difficult than you might think. Suppose for example your subject is ...

**math**

Oops: I've got the last bit of the explanation of c) incorrect, but I'm sure you can correct it.

**math**

What fun! a) You can cancel out numbers that are common to the top and bottom of a fraction... but you can't cancel individual digits! b) These examples suggest that a/b + c/d = (a+c)/(b+d). Wrong! c) These examples suggest that {a+(b/c)} - {d+(e/f)} = {(a-d) + (b-e)/(f-d...

**U.S. Government**

A depressing, but no doubt accurate explanation. We have a similar system over here in the UK: it's been either "Heightened" or "Extreme" for as long as I've been aware of it - and now that you've spelt it out, I realise I'd actually assume ...

**math**

This has been posted elsewhere, and is answered there.

**math**

This has been posted elsewhere, and is answered there.

**math**

Do you mean how many separate pairings exist between two groups of objects, each of which contains eight elements? If so, the answer is (8 x 8) = 64. The reason I'm slightly cautious about the answer is that I'd have expected the second part of the question to be ...

**PHI103: Informal Logic**

I'll have a go at just the first one, because I think it illustrates a point that's worth making. Forget the multiple-choice options for a moment: concentrate on the original statement, which when you rephrase it slightly asserts that the only overdues at the store are...

**math**

What is the actual question please?

**alegebra**

Divide any whole number by any other whole number that isn't a factor of it. For example, try dividing 3 by 2. Is the result a whole number?

**Algebra**

A vehicle uses 1 tablespoon of gasoline to drive 125 yards. How many miles can the vehicle travel per gallon? Round your answer to the nearest mile. (hint: There are 256 tablespoons in a gallon)

**Physics Flux**

The electric flux through the surface shown in Figure Ex27.10 is 15.0 Nm2/C, and the electric field makes an angle á = 70° with the surface. What is the electric field strength? The surface is a 10cm by 10cm square.

**science**

ops! b.the science of patterns and relationships

**science**

c.the science of numbers .???????

**science**

What is the definition of Mathematics? a.adding and subtracting numbers b.the science of patterns and relationships c.the science of numbers d.a really hard subject

**science**

????? Please help

**science**

Which shows the expression below simplified? (3.6 × 10^15) + (1.8 × 10^12) a. 3.60018 × 10^15 b. 3.902 × 10^14 c. 3.618 × 10^15 d. 3.6018 × 10^15

**9gr**

impossible

**8th Grade Algebra**

Ok. I wa thinking that! Thank you!

**8th Grade Algebra**

I think that... 3m - 10 = 2(4m-5) 3m - 10 = 8m - 10 +10 on both sides but the thing is, I'm stumped when i get... 3m = 8m I don't think this is possible but I'm thinknig I'm doing something wrong here so that's why I posted.

**8th Grade Algebra**

3m - 10 = 2(4m -5)

**9gr**

1. At 11:00 a.m. a one-meter-high mailbox casts a 0.7-meter shadow. If a pole beside the mailbox casts a 28-meter shadow, how tall is that pole? 400 m 40 m 0.4 m 4 m

**9th grade**

4g

**9th grade**

Write an algebraic expression for the phrase. the product of g and 4 a.4g b.g + 4 c.g/4 d.g – 4

**9 gr**

Write each product in exponential form. 16 × 16 × 16 × 16 × 16 a.5^16 b.16^5 c.16^6 d.16^4 my answer 16^5

**10th grade**

5x5x5x5=5^4

**Algebra**

3m - 10 = 2(4m -5)

**Science**

An airplane flew a distance of 650 km at an average speed of 300km/h. How much time did the flight take?

**physics**

A truck is stopped at a stoplight. When the light turns green, it accelerates at 2.9 m/s2. At the same instant, a car passes the truck going 12 m/s. Where and when does the truck catch up with the car?

**physics**

A bike accelerates from 0.0 m/s to 4.1 m/s in 6 s. What distance does it travel? thanks for the help

**physics**

A bike accelerates from 0.0 m/s to 4.1 m/s in 6 s. What distance does it travel? thanks for the help

**Algebra**

Sorry I forgot to put in the answer. It's 2d +1/5 = 3/5

**Algebra**

2d + 1 fifth

**5th Grade Math**

I'm putting the answer on the right because that's how I'm used to it. so... (3*0.1) + (X) = 0.38 First we do the problems in parentheses. Since we are looking to find X we are not going to do that right now. (3*0.1) = 0.3. Now we subtract that from the equation. 0...

**Algebra**

this is 2d + 1 fifth. Sorry the formatting for this problem is incorrect.

**Algebra**

2d + 1 --- 5

**MATH**

11 hotdogs

**Physics**

3 There are two charges +Q and –Q/2 that locate at two positions with a separation of d as shown in Fig. 1. We may put +Q at the origin of the x-axis to facilitate the calculation. (a) Find the electric field for +Q and –Q/2 at the position P. (5 points) (b) What is ...

**Physics**

The figure below shows two pint charges, each of -2Q, fixed on the y-axis at y = +a and at y = -a . A third points charge -Q is placed on the x-axis at x = 2a . Express all algebraic answers in terms of Q, a, and fundamental constants. (a) What is the net force (magnitude and ...

**math**

Find the standard deviation for the data. Round your answer to one more decimal place than the original data. {15,13,31,42,58,78}

**Finance**

7,200 at 10% and 4,800 at 15%.

**Math**

( -4 ) 3 (----) ( 5 ) if you can't read that, negative 4, fifths, squared. -4/5 in parentheses.

**G.A**

What is the answer to the brainteaser NOMMAG

**Chemistry**

What is the freezing point of an aqueous 2.65 m calcium chloride (CaCl2) solution? The freezing point of pure water is 0.0ºC and Kf of pure water is -1.86ºC/m.

**Algebra**

So, I'm thinking based on the sites you given that... body temperature = rational number money owed = rational number home runs = whole numbers Is this correct?

**Algebra**

I have some understanding of this but not quite sure how to do the problem. Direction & problem below. Direction: Tell whether whole numbers, integers, or rational numbers are the most reasonable to describe each. Explain your answer. Problem: body temperature; money owed; ...

**statistics**

4343

**Algebra**

Abby has four times as many pictures as Sally. Abby had 18 more pictures than Sally. How many pictures did each girl have?

**Algebra**

Bill has 12 more than three times the number of baseball cards Chyris has. Bill has 42 cards more than Chris. How many baseball cards does Chris have?

**Algebra**

Thank You Henry

**Algebra**

Randy, Sam, Tim and Will counted the number of puzzles they had solved in two months. Sam has solved twelve more than Tim. Randy had solved seventeen less than Sam.Will had solved twice as many as Randy. They have solved a total of 267 problems. How many puzzles did each ...

**algebra**

6/7s-3/4=4/5-1/7s+1/6

**math**

6/7s-3/4=4/5-1/7s+1/6

**Physics (Static Friction)**

When you take your 1300-kg car out for a spin, you go around a corner of radius 56.9 m with a speed of 15.8 m/s. The coefficient of static friction between the car and the road is 0.75. Assuming your car doesn't skid, what is the force exerted on it by static friction? I ...

**C++ Programming**

I already know how to use Visual C++ Express but I;m having a problem that I can not figure out. So, my problem is below. I go into Skript.rc Push F7 to build the RC script first. Output says... Fatal error RC1015: cannot open include file 'afxres.h' Other sources tell...

**C++ Programming**

Hello. I use Visual C++ 2010 Express and don't know why this is occuring. I go into Skript.rc Push F7 to build the RC script first. Output says... Fatal error RC1015: cannot open include file 'afxres.h' Other sources tell me to replace it with windows.h but then it...

**Chemistry**

A compound on heating gives a crackling sound, a reddish fume, and a gas which relights a glowing splint. the residue is reddish brown when hot and yellow when cold. What are- 1. the compound? 2. the fume 3. the gas 4. the residue?

**math**

sorry, i made a mistake, for mutually exculsive events, P(EnF)= 0, hence, from the previous equation, 0.3=0.2+P(F)-0 so P(F)= 0.1

**math**

Let P(F)= X since E and F are independent eveents, P(EnF)= P(E)* P(F) therefore, P(EnF)= 0.2X but P(EuF)=P(E)+ P(F)- P(EnF) 0.3= 0.2 + x - 0.2x x = 1/8

**Excel**

What is the formula to figure out these two problems?

**math**

Corrine has 3 quarters, 7 dimes, 6 nickels, and 4 pennies in her pocket. If one coin falls out, what is the probability that it will not be worth more than $0.10? 3/20 7/20 1/2 17/20

**Probability**

If you toss 4 coins, what is the probability of getting exactly 1 head and 3 tails? 1/16 1/4 3/8 1/2

**physics**

boat is m1 = 300 kg Isaac is m2 = 62 kg towards dock is + away from dock is - original velocity of both is v = +0.50 m/s v2' = final velocity of Isaac v1' = final velocity of boat v2'-v1' = +3.0 m/s (because Isaac jumps off the front of the boat & is moving ...

**physics**

boat is m1 = 300 kg Isaac is m2 = 62 kg towards dock is + away from dock is - original velocity of both is v = +0.50 m/s v2' = final velocity of Isaac v1' = final velocity of boat v2'-v1' = +3.0 m/s (because Isaac jumps off the front of the boat & is moving ...

**9gr**

Caleb scored the following on his first four tests: 78, 84, 88, and 82. What is the least grade he can receive on his next test to have an average of 85 for the five tests? a.66 b.83 c.93 d.100

**Pythagorean Theorem**

Which is closest to the length of the diagonal of a square whose sides measure 20 cm? a.20 cm b.28 cm c.40 cm d.200 cm

**Pythagorean Theorem**

Pythagorean Theorem - david, Thursday, July 15, 2010 at 2:10pm EFG 3,6,9 HIJ 60,156,144 KLM 56,102,105 NOP 36,48,64 The following are the lengths of the sides of four triangles. Which is a right triangle? a.Triangle EFG b.Triangle HIJ c.Triangle KLM d.Triangle NOP

**Pythagorean Theorem**

EFG 3,6,9 HIJ 60,156,144 KLM 56,102,105 NOP 36,48,64 The following are the lengths of the sides of four triangles. (See assignment sheet for chart). Which is a right triangle? a.Triangle EFG b.Triangle HIJ c.Triangle KLM d.Triangle NOP

**Pythagorean Theorem**

7. The following are the lengths of the sides of four triangles. Which is a right triangle? Triangle EFG Triangle HIJ Triangle KLM

**Pythagorean Theorem**

28 cm

**Pythagorean Theorem**

Which is closest to the length of the diagonal of a square whose sides measure 20 cm?

**Pythagorean Theorem**

24 ft

**Pythagorean Theorem**

A ladder resting against the side of a building reaches 32 ft up the building. If the ladder is 40 ft long, how far from the building is the base of the ladder?

**9th grade**

The lengths of 2 legs of a right triangle are 16 cm and 30 cm. What is the length of the hypotenuse?

**Chemistry**

molarity is .1 for all substances, volume of HCl and HC2H3O2 is 8.00ml each, both diluted in 100ml of water

**algebra**

solve by square root property (8x-3)squared=5

**college chemistry**

calculate the pressure exerted by 1.00 moles of CO2 confined in a volume of 5.00 L at 450. K. Compare the pressure with that predicted by the ideal gas equation.

**college chemistry**

so the answer would be18.5 atm using the formula p= nRt/V correct?

**college chemistry**

calculate the pressure exerted by 2.50 moles of CO2 confined in a volume of 5.00 L at 450K. Compare the pressure with that predicted by the ideal gas equation.

**math**

Find the derivative of the function. y = (x^2+8x+3)/square root of x

**Government Check**

Which is NOT true of the segregation laws passed after the Civil War?

**intermediate algebra**

3(5-7)^8 divide 4

**chemistry**

Thank you

**chemistry**

If 20 mL of 0.10 M NaOH are added to 30 mL of 0.20 M HOAc, what is the pH of the resulting solution? (Ka = 1.8 ´ 10-5 for HOAc.)