# Posts by Andrea

Total # Posts: 856

**algebra**

Solve for y, xy + x = -3 How do you do this? I can't seem to come up with the correct answer...

**algebra**

how do i complete the table with 4x-y=5 x: 0 1, 2 and im trying to find 'y'

**Algebra**

solve the linear system using substitution 4x - y=5 4x + 4y= -4 Also by using elimination.

**Chemistry**

How do you convert it to moles of asprin?

**Chemistry**

Aspirin (C9H8O4) is synthesized by the reaction of salicylic acid (C7H6O3) with acetic anhydride, C4H6O3. 2C7H6O3 + C4H6O3 −→ 2C9H8O4 + H2O When 19 g of C7H6O3 and 19 g of C4H6O3 react, which is the limiting reagent?

**algebra**

Damon, thank you so much!! This helped a lot!

**algebra**

Hi, I need some help on my homework. Can you help me? True or False, if False correct the underlined portion. 1) If 3<x, then 3+y<x+y 2)If |w-7|<-3, then w-7>-3 or w-7<3 3) If -4<-2t+6<10, then 2>t+6>-5 4) If |y+8|+2=6, then y+8=+-4* * the "+&...

**AlgebraII**

How do you get the answer for this equation a+2b+(14a-5b)-[6a+6b-(a+4)]

**physics**

which natural phenomenon can describe light as a wave?

**chemistry**

The height of a stack of 5 pennies is 0.72 cm and the radius of the stack is 0.91 cm. The volume in mL of this stack of 5 pennies is...

**Math**

WHERE DO I PUT THE PERENTHESIS TO MAKE THIS STATEMENT TRUE: 18+2*1+3 TO THE SECOND POWER

**medical billing and coding**

Your search for This 82-year-old female was admitted for acute exacerbation of chronic obstructive pulmonary disease. The progress notes indicate that the patient received a transfusion for anemia. The discharge diagnoses state acute exacerbation of chronic obstructive ...

**chemistry**

treatment of a 0.400g sample of impure potassium chloride with an excess of AgNO3 resulted in the formation of 0.733g of AgCl. calculate the percentage of KCl in the sample. show balanced equations in support of your answer

**math**

In a family of 5 children, how many different ways can you have 3 boys and 2 girls?

**math**

Thanks, Steve. I believe we were supposed to convert the 16 inches into centimeters first (which is 40.64 cm, right?) to solve for both V and A and then take our final, not-rounded answer, convert it back into inches, and then round.

**math**

Find the volume and surface area of a right cylinder with radius 7.5 cm and height 16 in. Make sure your final answer is in inches. Round your answer to the nearest hundredth.

**math**

Thank you, Ms. Sue and Vanessa! I thought this might be a trick question, and that perhaps the correct answer was 2 (keeping logs whole).

**math**

Mr Logan can saw 8 logs in 3 hours. How many logs can Mr Logan saw in one hour?

**medical billing/coding**

I need help coding this question. could someone help me. CPT CODE:__________________________ ICD-9-CM CODE:_____________________ Code the following "You've started your first day at Venture Outpatient Surgery Center. OPERATIVE REPORT: Preoperative diagosis: Left flank...

**medical billing and coding**

what are the CPT and ICD-9-CM codes for following question? "this is a pleasant female who comes in with a soft tissue lesion in the left flank over what appeared to be a spigelian hernia site as well. However, it was not reducible and did not appear to be consistent ...

**Physical Science**

1. You are assigned to take care of a patient who is scheduled to undergo a surgical operation. The doctor told you not to allow the patient to eat for twelve hours. How many minutes is the fasting period? 2. What is the density of a rock (in g/cm3) which has a volume of 2.5 ...

**geometry**

If m∠BCD = 60 and m∠DEC = 80, what is the measure of ∠DEF

**business**

ACTUAL DECISION / PREDICTED DECISION A B C A 80 5 12 B 14 60 14 C 10 15 70

**business**

A researcher was given the assignment of predicting which of three actions would be taken by the 280 employees in the Desota plant that was going to be sold to its employees. The alternatives were to: a. Take severance pay and leave the company. b. Stay with the new company ...

**geometry**

Length of CD would be 26.

**geometry**

a circular cylinder has a base with a radius of 7.5 cm. and a height of 12 cm. a rectangular prism has a square base and height of 8.0 cm. if the cylinder and the prism have equal volumes, what is the length of the base of the prism to the nearest tenth?

**Algebra**

f(x)=x^2-1 ; x = -3, -2, -1, 0, 1, 2, 3 i got 8,3,0,-1,0,3,8 as the answer when i plugged in x. how would i graph these numbers from this function?

**Econ**

Do people living in countries with higher real GDP necessarily have better living standards compared to countries with relatively lower GDP? Give practical example. 2. What measures would better compare the well-being (living standard) for residents of different countries? How...

**Chemistry**

Which of the following pairs of compounds will give a precipitate in a diluted solution?** a) Cu(NO3)2 and Na2CO3 b) KNO3 and NaCl c) MgCl2 and Ba(NO3)2 d) NH4Cl and Al2(SO4)3 A solution contains I-, Br- and OH- ions. If Ag+ is added, what will the precipitate(s) be? a) AgOH b...

**Chemistry**

Acetic acid dissociates/ionizes itself as follows: CH3COOH(aq) ⇔ H+(aq) + CH3COO-(aq) If you add sodium acetate, CH3COONa, to the solution: a) a precipitate will be formed b) more acetic acid will be ionized c) the concentration of hydrogen ions will decrease d) the ...

**Chemistry**

A mixture of lead, magnesium, nitrate and chromate ions are present in a solution. What will the precipitate be?** a) MgPb b) Pb(NO3)2 c) PbCrO4 d) MgCO3

**Chemistry**

Consider the reaction 3X + Y ⇔ 2W + Z. At equilibrium, [X] is 7.0 M, [Y] is 6.0 M, [W] is 5.0 M and [Z] is 7.0 M at 298 K. The value of the equilibrium constant at this temperature is: a) 0.085 b) 0.560 c) 1.800 d) 11.760

**Chemistry**

0.80 mol/L of A and B are mixed. They react very slowly to produce C and D as follows: A(aq) + B(aq) ⇔ C(aq) + 2D(aq) When equilibrium is attained, the concentration of C is 0.60 mol/L and the concentration of A is: a) 0.20 M b) 0.40 M c) 0.60 M d) 0.80 M

**Chemistry**

In the system A(g) + 2B(g) ⇔ 2C(g) + 2D(g) ΔH=21 kJ/mol, it is possible to increase the quantity of C by: a) adding a catalyst b) decreasing the [B] c) increasing the pressure d) increasing the temperature

**Chemistry**

For the following acids: i. CH3COOH ii. HNO2 iii. HCN a) What is the dissociation equation in an aqueous solution? b)Give the KA expression for each of the acids. c)Identify the acid-base pairs.

**Chemistry**

A weak acid solution, HX 0.37 M, has a pH of 3.70. Calculate the acidity constant for this acid.

**Chemistry**

Calculate the volume of Ba(OH)2 0.20 M necessary to neutralize 300.0 mL of H3PO4 0.30 M. (4 marks)

**chemistry**

What is the pH of a solution prepared by dissolving 12.2 g of benzoic acid in enough water to produce a 500 mL solution?

**Chemistry**

Commercial vinegar usually has a concentration of 5%, per volume. a) Calculate the [H3O+] , if the density of acetic acid is 1.051 g/mL. b) Calculate the pH.

**Chemistry**

Calculate the KA of formic acid if 2.3 g of it is dissolved in 1 litre of water to give [H+] of 0.003 M.

**Chemistry**

The equilibrium constant for the following reaction is 7.2 x 10-10. What is the [H+] in a solution 1.0 M of this acid? HCN + H2O --> H3O+ + CN-

**Chemistry**

200 g of CH3COOH are dissolved in enough water to make 1.5 L. What is the molarity of the acetic acid solution?

**Chemistry**

Which of the following contains the highest H3O+ ion concentration? Explain your answer. HCl 0.1 M HCH3CO2 0.1 M

**Chemistry**

a) What is the dissociation equation in an aqueous solution? b)Give the KA expression for each of the acids. Identify the acid-base pairs.

**Chemistry**

Are the reactants or the products favoured in the following reactions? a. CH3COOH with NH3? b. HS- with HCO3-? c. HNO2 with NH3 d. NH4+ with F- e. C6H5COOH with CH3COO- f. H2SO3 with HCO3- g. H2CO3 with SO32- h. H2SO3 with SO32-

**Chemistry**

Classify the following 3 acids in order of increasing acidity: Acid 1:Ka = 8 x 10-6
Acid 2:Ka = 6 x 10-4
Acid 3:Ka = 9 x 10-11

**Geometry**

1=d 2=c 3=b 4=d 5=a 6=c 7=d 8=b 9=c 10=c 11=a

**Geometry**

81.25$

**Math 3rd grade**

Fred needs to do quite a few errands. He needs to stop by the cleaners, the post office, the hardware store, and the bank. There are a number of ways he can tackle his list of stops. How many ways can he accomplish his tasks?

**geometry**

1=d 2=c 3=b 4=d 5=a 6=c 7=d 8=b 9=c 10=c 11=a

**business**

On December 31 of last year, Wolfson Corporation had in inventory 400 units of its products, which cost $21 per unit to produce. During January, the company produced 800 units at a cost of $24 per unit. Assuming that Wolfson Corporation sold 700 units in January, what was the ...

**business**

At the end of January, Mineral Labs had inventory of 725 units, which cost $10 per unit to produce. During February the company produced 650 units at a cost of $14 per unit. If the firm sold 1,000 units in February, what was the cost of goods sold? a. Assume LIFO inventory ...

**Earth/Space Science**

What is one way you can make a difference and decrease the impacts of soil erosion?

**astronomy**

Suppose that the gravitational time dilation on the surface of a star is 1.1. What would be the escape velocity from the star?

**astonomy**

If 100 asteriods, each of diameter of 100 km, were combined into a single object, approximately what would its diameter be?

**Algebra**

I have an input / output machine I need a rule I can use for any value, like 10 or 100 input 1, output 3 input 2, output 6 input 3, output 12 input 4m output 24

**Chemistry**

Hoe Many moles of each reactant are Needed to produce 3.60 x 10^2g CH3OH?

**7th grade math**

what elevacion a potencias y sus operciones inversas

**science**

_____ 3. You should indicate direction when reporting speed. TRUE OR FALSE

**English**

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**Math**

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**Pre-Algebra Math**

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**physics**

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**math**

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**English-please help!**

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**calculus**

wat is the ans of this solutions? y=sin^4x cos4x? ^

**Math**

A satellite in a circular orbit 879.4 mi above the earth makes one complete orbit every 83.42min. What is its linear velocity? Use 3963 mi for the length of the radius of the earth.

**Math**

How many different groups of 20 can you make from 40?

**Statistics**

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**trig**

The terminal side of θ lies on a given line in the specified quadrant. Find the values of the six trigonometric functions of θ by finding a point on the line. Line: (55/48)x Quadrant:III sin(θ)= cos(θ)= tan(θ)= csc(θ)= sec(θ)= cot(θ)=

**chemistry**

is the answer 1,663,558.4 J

**world history**

Why is increased interregional trade a factor that represents the most significant cause of growth of cities in Afro-Eurasia in the period 1000-1450?

**Physics**

a ball is released from rest and rolls down in an inclined plane, requiring 4 sec. to cover a certain distance of 100m. a) what is the acceleration? b) how many cm would it have fallen vertically in the same time?

**Physics**

a bomb is dropped from an airplane travelling horizontally with a speed of 300 mi/hr if the airplane is 10000ft. above the ground, how far from the target must it be released, neglect friction?

**Physics**

the speed of the train is reduce uniformly from 15m/s to 7m/s while travelling a distance of 90m. a) compute the acceleration b) how much further will the train travel before coming to rest provided the acceleration remain constant.

**Physics**

a bus moving at a speed of 20m/s begins to slow at a constant rate. Find how far it goes before stopping?

**Physics**

a stone falls from a rail road overpass which is 36ft. high into the path of the train which is approaching the overpass with the uniform speed, if the stone falls when the train is 50ft. away from the overpass and the stones hits the ground just as the train arrives at the ...

**Math**

draw a line segment AB to be 3 cm long. the, draw line segment DC so that it is congruent, but not parallel, to line segment AB

**nutrition**

A--> Had a a helping verb, rested is the very

**math**

the favorite foods of a selected group of 5 year olds. A total 5,280 childern were polled. How many children chose pizza? 40% were pizza, pasta 30%, cheese 12%, french fries 14% undecided 4%

**math**

the favorite foods of a selected group of 5 year olds. A total 5,280 childern were polled. How many children chose pizza? 40% were pizza, pasta 30%, cheese 12%, french fries 14% undecided 4%

**business math**

Vail Ski Shop received a $1,201 invoice dated July 8th wiht 2/10, 1/15, n/60 terms. On July 22, Vail sent a $485 partial payment. What credit should Vail receive? What is Vail's outstanding balance?

**business math**

Vail Ski Shop received a $1,201 invoice dated July 8th wiht 2/10, 1/15, n/60 terms. On July 22, Vail sent a $485 partial payment. What credit should Vail receive? What is Vail's outstanding balance?

**business math**

How do you find the amount deducted from Social Security and Medicare from a check? How do you find a percent of a noninterest simple discount note?

**math**

Vail Ski Shop received a $1,201 invoice dated July 8th wiht 2/10, 1/15, n/60 terms. On July 22, Vail sent a $485 partial payment. What credit should Vail receive? What is Vail's outstanding balance?

**math**

calculate the average daily balance from the following(30-day billing cycle) 7-21 billing date previous balance $400 7-28 payment $40 credit 7-31 charge $60 8-6 payment $10 credit 8-13 cash advance $50

**statistics**

x= 70 115 105 82 93 125 88 y= 3 45 21 7 16 62 12 compute r using the computation formula nearest thousandth

**statistics**

x= 70 115 105 82 93 125 88 y= 3 45 21 7 16 62 12 compute r using the computation formula nearest thousandth

**math**

Bill Spread, owner of the Bedding Shop, knows that his customers will pay no more than $300 for a comforter. Assume Bill wants a 30% markup on selling price. What is the most he could pay the manufacturer. for thid comforter?

**Mat**

What is mean median and mode

**statistics**

Pardon me... approximately zero if the standard deviation is 0.2 ozs.

**statistics**

Actually, I believe it's approximately zero. Source: I have a MS in Mathematics

**physics**

A horizontal rod with a length of 0.250 is mounted on a balance and carries a current. At the location of the rod a uniform horizontal magnetic field has a magnitude of 6.70×10−2 and direction perpendicular to the rod. The magnetic force on the rod is measured by ...

**physics**

A horizontal rod with a length of 0.250 is mounted on a balance and carries a current. At the location of the rod a uniform horizontal magnetic field has a magnitude of 6.70×10−2 and direction perpendicular to the rod. The magnetic force on the rod is measured by ...

**physics**

One end of a massless coil spring is suspended from a rigid ceiling. It is found that when a 4 kg mass is suspended from it the spring stretches 90 mm when the mass comes to rest. (a) What is the spring constant for the spring B)If the mass is then pulled down an additional ...

**Science**

I don't know

**physics**

A 10 N horizontal force pushes a block weighing 4.9 N against a vertical wall (Fig. 6-26). The coefficient of static friction between the wall and the block is 0.55, and the coefficient of kinetic friction is 0.35. Assume that the block is not moving initially. In unit-vector ...

**5th grade math**

First,you have to multiply 75x120.Next,you have to multiply 0x5.Then do all of the steps to get the answer.

**physics**

A sign that has a mass of 10.0kg is suspended by two wires, as shown below. (wire 1 is at a 40 degreee angle with the sign, wire 2 is at no angle) Determine the force exerted by each wire in supporting the sign. \in cluse a free-body diagram as part of your response.

**Chemistry**

What is the molarity of H2SO4 in a solution prepared by adding 15.0 mL of 6.0 Molarity H2S04 to enough water to make 100.0 mL of solution?