# Posts by san

Total # Posts: 133

**chemistry**

A 1.0 g sample of food reacts with oxygen in a calorimeter containing 500 g of water. The temperature rises 10°C. What is the energy content of the food?

**math**

A bank wonders whether omitting the annual credit card fee for customers who charge ar least $3000 in a year will increase the amount charged on its cards. The bank makes this offer to an SRS of 400 of its customers. It then compares how much these customers charge this year ...

**physics**

A body at rest explodes into three equal parts, two parts after explosion fly off due north and west respectively with velocity 8m/s then calculate the magnitude and direction of velocity of 3rd pat.

**Stats**

Urn 1 contains 3 green balls and 5 white balls, and Urn 2 contains 2 green balls and 4 white balls. A ball is drawn from each urn. What is the probability that both balls are green?

**Biology**

There are quite a few. The four most common are: cephalosporins, macrolides, quinolones, and penicillins. However, many of these are cloned and expressed in bacterial hosts.

**Science**

light from the sun isn't actually considered matter. It would be leaves.

**Science**

This is actually hurting the dog so its not commensalism.

**biology**

actually all of those disciplines do have some foundation in biology but that doesn't change my initial answer.

**biology**

Only two of those answers have a foundation in biology and its not B. I would probably say A.

**Biology**

A few ways, but usually as a glucose polymer stored within a vacuole of some sort.

**biology**

The last one.

**Biology**

Plasma membrane, perhaps. It is semi-permeable not permeable. They are essential for all living cells which includes prokaryotic and eukaryotic organisms. Selectivity due to receptors and other proteins does allow for homeostasis.

**science**

There's missing information.

**Biology**

It would probably be a chloroplast, although they're not only found in plants. Light-dependent reactions take place within these organelles. Although, green is reflected away so it wouldn't be the favorite color, it would be red or blue, depending on the chlorophyll.

**biology**

doesn't*. Sorry about that.

**biology**

A community simply describes the different population of organisms within a geographic range, it does include any physical characteristics, that's an ecosystem. Think about the organisms you listed and whether you think they could be found together.

**Biochemistry**

Calculate the amount (in grams) of Tris Base needed to make 1L of 0.01M Tris buffer? Tris Base=121.4 g/mol

**Math**

Supplementary angles have a combined sum of 180 degrees. You have one value given, so......

**College Algebra**

That's right. Did it mark it wrong because you forgot to add the base? Or a different input format?

**science**

It's B

**math**

What's the amount for the last one?

**Trigonometry**

50/(tan(41)) = x

**Math**

y=mx+b with M being your slope. What do you think the answer is?

**MAth**

Am I dead, perhaps

**Help somone!! (Technical Diffculties with Jiskha)**

are you trying to post links?

**math**

(12+18+16+17+X)/5=16 solve for x

**geometry**

P=2(L+w) 28=2(2.5w+w) 28/2=3.5w 14/3.5=w w=4 I found the width for you now use that information to find the length. I also gave the formula for the perimeter of a rectangle.

**math**

Where's the data?

**science (cladogram)**

Without getting into much detail he would compare their genome and look for similarities that might indicate that they are closely related and perhaps belong on the same lineage or not.

**Reading**

What's the question?

**PHYSICS**

F=kx F: refers to the force applied to the spring K: the spring constant of your particular spring. X: the distance stretched Find the spring constant from the first statement of your question and use that to find the distance stretched by the 100N force.

**Science**

They would form an ionic bond

**Algebra**

Is there more to this? If not then: X^15*Y^5

**chemistry**

Ammonium hydrogen phosphate, a common fertilizer, is made from reacting phosphoric acid with ammonia (NH3). If 10.00g of ammonia react, how many grams of fertilizer will be produced?

**Algebra 2**

Let F(x) = -5x-4 and g(x) = 6x-7 find the f(x)+g(x) 1.-11x+3 2.x+3 3.-11x-11 4.x-11

**7th grade math**

For the 3rd should be: =7x + 5 - 3y + 3x + 5 - 4y =10x -7y + 10

**Economics**

So b?

**Economics**

What is an oligopoly? A. An agreement by a formal organization of producers to coordinate prices and production B A market structure in which a few large firms dominate the market C A market structure in which two firms have a price way D a market structure in which a single ...

**Economics**

Thank you

**Economics**

according to the law of supply the higher the price A the more consumers are willing to pay B the larger the quantity produced c the smaller the quantity produced D the more the availability of a good is reduced

**Chemistry**

Transition metals exist in many oxidation states.

**Biology**

G1 checkpoint mechanism ensures that the cell is ready for cell division

**Biology**

yes

**Biology**

1. wrong, eye cells are somatic, while egg cells are not. 2. correct. 3. wrong. 78 homologous pairs would equal 156 total chromosomes.

**physics**

2) KE=1/2*m*v^2 sorry about that.

**physics**

1) KE=1/2*m*v^2 (KE*2)/v^2=m 2) KE=m*v^2 use the mass we found and convert mph to m/s

**Biology**

correct

**chemistry**

well if the system loses heat E, delta H is - , if the system requires an input of energy delta H is +

**physics**

what are you asking for?

**Math**

i don't know how you got 105. it should be 90. so, -10x=90 divide by -10

**algebra**

$5=F $2=T F+T=500 5F+2T=$1450 solve for either variable on either equation and plug into equation you did not use. the rest should pretty straightforward from there

**math**

before you actually apply these equations you need to know the equivalences between the two units being analyzed

**math**

oops y lbs * (x kg/ y lbs) = x kg

**math**

x kg * (y lbs/ x kgs) = y lbs

**science**

e=mc^2 solve for m

**Biology**

I'm assuming your asking how is the energy conserved? If so, it is in the form of ATP

**Biology**

during the ETC

**Biology**

Oxidative phosphorylation

**algebra**

this seems incomplete. is there anything else?

**chem**

look up hess's law. you should be able to figure it out

**Math**

F= frank, B= Buds F+B=56 b=f*8 plug in the equivalence and solve for f

**Algebra please help out**

You have a quantity of one compared to another quantity. example: 1cat/5Dogs For every 5 dogs, you'll have 1 cat.

**physics**

KE=1/2*m*v^2 solve for v

**Algebra 2**

All you need to do is FOIL

**MATH**

i don't know what youre question is

**Math**

they might be products of the proof that derived that formula

**Math**

13 in is the length of the foot if its a size 15 shoe. that's a big foot

**Math**

yeah just plug in the 15 for s into your formula and rearrange to find f, foot length

**Math**

are you just asking for rearrangement? if so, (s+24)/3=f

**Algebra**

im assuming youre talking about an equilateral triangle. the perimeter is A+b+C=18 and one side is 2x-1 so so 2x-1+2x-1+2x-1=18 combine like terms 6x-3=18 so 21/6=x x=3.5

**math**

its 180

**math**

youre right. i misread the problem

**math**

315

**math**

same rate as in she picks 9lbs/hr. if that's what shes asking. not clear

**math**

72/9= 8 hours so double the weight at the same rate? 144/9= 16*12= $192

**Algebra**

im assuming youre talking about an equilateral triangle. the perimeter is A+b+C=18 and one side is 2x-1 so so 2x-1+2x-1+2x-1=18 combine like terms 6x-3=18 so 21/6=x x=3.5

**Algebra**

what kind of triangle is it. and on what side?

**physics**

oops. but would the answer be correct if everthing was factored in?

**physics**

The average car today has a mass of 1100 kg, and when accelerating from rest, covers 0.25 miles in 15 seconds. Each rim and tire together has a diameter of 46 cm and a mass of 9.1kg. If we agree the rim and tire have the shape of a solid disk that rotates through its geometric...

**Physics**

PE =mgh = 0.1* 9.8 * 0.80 m = 0.784 J

**PHYSICS**

A SPRING WITH A CONSTANT K = 8N/m IS STRETCHED 5CM AND RELEASED. IT BOBS UP AND DOWN EVERY 2.5 SECONDS. WHAT IS ITS FREQUENCY, PERIOD, ABD AMPLITUDE

**solving equations by sibstitution**

multiply the top by positive 8 and multiply the bottom by negative 6. then cancel out the y's and solve for x. plug x back into anyone and solve for y.

**Physics**

Oh. That was quite straight forward. Thank you.

**Physics**

A force of 3.0 newtons applied to an object produces a change in velocity of 12 meters per second in 0.40 second. the mass of the object is? I am not sure how to solve this problem. Formula for momentum is p= mass times velocity impulse (J) = Fnet times time in seconds

**chemistry**

Assume you are performing the calibration step of Experiment 8 and you begin with 70 g of water at 20 oC and 70 g of water at 80 oC. After adding the two portions of water into your calorimeter setup and following the procedure outlined in the experiment, you determine the ...

**ua**

Assume you are performing the calibration step of Experiment 8 and you begin with 70 g of water at 20 oC and 70 g of water at 80 oC. After adding the two portions of water into your calorimeter setup and following the procedure outlined in the experiment, you determine the ...

**Physics**

A hot air balloon containing an AP Physics student ascends vertically at a constant speed of 8 m/s. While ascending, he accidentally drops his rubber duckie from the gondola of the ballong. Seven seconds after it is dropped the duckie bounces off a roof at point A and hits the...

**finance**

The Nutrex Corporation wants to calculate its weighted average cost of capital. Its target capital structure weights are 40 percent long-term debt and 60 percent common equity. The before-tax cost of debt is estimated to be 10 percent and the company is in the 40 percent tax ...

**Spanish**

11. Si ---------- el número de mi jefe, le -------- para decirle que no puedo ir al trabajo hoy. A. sabría, llamara B.llamaría, supiera C. supiera, llamaría D.llamara, sabría My Ans: C 12. ------------ a la fiesta si ----------- encontrar un...

**Spanish help please**

Si ---------- el número de mi jefe, le -------- para decirle que no puedo ir al trabajo hoy. sabría, llamara llamaría, supiera supiera, llamaría llamara, sabría 12. ------------ a la fiesta si ----------- encontrar un vestido apropiado para ...

**chemistry**

abcbbbbbbbbbcddddaaaaaaaaaaaa

**Accounting**

tender price ~ 59.22/sq.m

**Maths**

if the ratio of the length to the breadth of a rectangle be 5:3 and its perimeter is 144m, find the length of the rectangle .

**fin decision making for managers**

Aberdeen Corp. uses activity-based costing system with three activity cost pools. The following cost information is provided: Wages and salaries $ 220,000 Depreciation 120,000 Utilities 100,000 Total $440,000

**Algebra II**

x-5x=2(-3x+4)

**chem**

When a bond forms between C(H3) and MgBr, why would MgBr have a partial positive charge?

**chemistry**

How do I draw Lewis Structure for BN and CN-

**Business Finance**

35,0000

**chemistry**

PCL5(g) -> PCl3(g) + Cl2 (g) Kp= 23.6 at 500K Calculate the equlibrium partial pressures of the reactants and products if the initial pressures are Ppcl5 = 0.560atm and Ppcl3 = 0.500atm.

**Chemistry**

Is it possible to calculate heat of vaporization if i only have pressure and temperature.