# Posts by shana

Total # Posts: 99

**Linear algebra**

please help me with this question I have no idea how to solve it, thanks Suppose T is a transformation from ?2 to ?2. Find the matrix A that induces T if T is rotation by 1/6?.

*March 21, 2017*

**Algebra**

Find the scalar equation for the plane passing through the points P1=(?3, ?5, 5), P2=(1, ?6, 6), and P3=(0, ?9, 4).

*March 19, 2017*

**Algebra**

Thank you so much

*March 19, 2017*

**Algebra**

Let L be the line passing through the point P=(1, ?1, ?5) with direction vector ?d=[?2, ?4, 3]T, and let T be the plane defined by ?x+y?3z = ?1. Find the point Q where L and T intersect.

*March 19, 2017*

**Algebra**

can anybody help me with this question please? Let L be the line passing through the point P=(5,Â âˆ’5,Â 3) with direction vector â†’d=[1,Â âˆ’3,Â âˆ’2]T. Find the ...

*March 1, 2017*

**Algebra**

I spent hours on this and I still cant figure it out please help me: Let L1 be the line passing through the points Q1=(4, 2, ?3) and Q2=(5, 5, ?5). Find a value of k so the line L2 passing through the point P1 = P1(3, 7, k) with ...

*February 20, 2017*

**Linear algebra**

Let L1 be the line passing through the points Q1=(?2, 1, 1) and Q2=(?4, 4, 0) and let L2 be the line passing through the point P1=(?6, ?6, 0) with direction vector ?d=[9, 6, 3]T. Determine whether L1 and L2 intersect. If so, find the ...

*February 20, 2017*

**algebra**

Plus or minus of 0.05: As measured in standard deviations, how much is a year of learning in school worth on a test? Please answer with a decimal.

*February 27, 2015*

**statisics**

A major hurricane with wind speeds of 111 per hour or greater. During the last century the mean number of major hurricanes to strike a certain country mainland per year was about 0.45. Find the probability that in a given year exactly one major hurricane will strike the mainland

*February 1, 2015*

**chem**

When NH3 is treated with oxygen gas, the products obtained are N2(g) and H2O(l). If standard enthalpies of formation at 298 K for NH3(g) and H2O(l) are –46.00 kJ/mol and –286.0 kJ/mol respectively, calculate the enthalpy change of the reaction.

*January 27, 2015*

**chemistry**

When NH3 is treated with oxygen gas, the products obtained are N2(g) and H2O(l). If standard enthalpies of formation at 298 K for NH3(g) and H2O(l) are –46.00 kJ/mol and –286.0 kJ/mol respectively, calculate the enthalpy change of the reaction.

*January 27, 2015*

**business**

If u carry out a SWOT analysis you should know the " O" stands for a) outliers. B) opportunities c) outlines d) oddities

*August 19, 2014*

**Chemistry**

The following reaction is reactant-favored at equilibrium at room temperature. COCl2(g) -> CO(g) + Cl2(g) Will raising or lowering the temperature make it product-favored?

*May 1, 2014*

**Chemistry**

How do I find delta S of 2 Na(s) + 2H2O(l) -> 2NaOH(aq) +H2(g)? I tried to find it using this.... ^Srxn= 2S(NaOH) - S(H2) -2S(Na) - 2S(H2O) = 2(48.1)-130.7 - 2(51.21) - 2(69.95) = 96.2 - 130.7 - 102.42 - 139.9 = -279.82 Where did I go wrong??

*May 1, 2014*

**Chemistry**

Estimate the solubility of calcium fluoride, CaF2+, (a) in moles per liter and (b) in grams per liter of pure water. CaF2+(s) = Ca2+(aq)+2f-(aq)

*April 22, 2014*

**Chemistry**

Calcium hydroxide, Ca(OH)2, dissolves in water to the extent of 1.78 g per liter. What is the value of Ksp for Ca(OH)2?

*April 22, 2014*

**science**

why it is important to take care of the eyes and go for a regular checkup?

*December 13, 2013*

**science**

probably , the answer is D

*December 13, 2013*

**Math**

32.04 x300

*December 2, 2013*

**British literature**

How do Falstaff's adventures mirror the main plot in Shakespeare's Henery the 4th

*October 25, 2013*

**Finance**

This is the answer to #5-Capital Co WACC 14.24%

*August 23, 2013*

**Finance**

THis is the answer to #3 Bell Vineyards 0 $2,000 1 $2,460 2 $2,780 3 $2,986 4 $3,101 5 $3,144 Year 6 to purchase

*August 23, 2013*

**Chemistry**

need help to balance half reaction in basic solution IO3 to I2

*July 27, 2013*

**chemistry**

pH = 3.89 calculate concentration of hydronium ion and hydroxide ion in solution.

*July 26, 2013*

**CURRENT PROCD TERMN CODING**

wHAT IS THE CODING SYSTEM PHYSICIANS USE TO FILE THEIR CLAIMS

*July 15, 2013*

**math**

Sven is thinking if two numbers. The sum is 12 . The difference is 4. What are the two numbers

*March 7, 2013*

**math**

estimate the sales tax and final cost of a book that costs $12.99 with a sales tax of 6%

*January 23, 2013*

**6 grade Math**

estimate the sales tax and final cost of a book that costs $12.99 with a sales tax of 6%

*January 23, 2013*

**chemistry**

When compared to compound B, compound A has lower melting and boiling points and vaporizes more readily. Is compound A an ionic compound or a molecular compound? A. Ionic B. Molecular I say B

*November 10, 2012*

**chemistry**

Which of the following consists of positive and negative ions bound together and held in place in a crystalline solid? A. Covalent bonds B. Ionic compounds C. Molecular compounds D. Molecules I say B

*November 10, 2012*

**chemistry**

Is diphosphorus pentoxide an ionic or a molecular compound? A. Ionic B. Molecular I say B

*November 10, 2012*

**chemistry**

Which phase of ionic compounds are good electrical conductors because the ions are free to carry electrical current? A. Solid B. Liquid C. Gas D. Crystalline I say B

*November 10, 2012*

**chemistry**

Which ion is absorbed by a base in water? A. H3O+ B. OH- C. Neutron D. Transition metal B

*November 10, 2012*

**chemistry**

What is usually indicated by an -ite or -ate ending in a chemical formula? A. The compound carries a net ionic charge of zero. B. The compound contains a polyatomic ion. C. The compound is an acid. D. The compound is molecular. I think A

*November 10, 2012*

**math**

When solving for the percent composition of a given compound, the percent of each element in the compound must be found and reported. True false TRUE

*November 9, 2012*

**math**

127.1 g Cu combines completely with 32.1 g S to form a compound. What is the percent composition of this compound? A. 20% Cu; 80% S B. 50% Cu; 50% S C. 80% Cu; 20% S D. 127% Cu; 32% S I say A

*November 9, 2012*

**math**

If there is a 75.0 g quantity of carbon present in each 100 g of a carbon and hydrogen compound, what is the percent composition of hydrogen in this compound? A. 25 g B. 25% C. 75 g D. 75% I say B

*November 9, 2012*

**math**

In order for the percent composition of a compound to be calculated, the molar mass of the compound and the chemical formula must be determined. True False I say true

*November 9, 2012*

**math**

What is the percent by mass of hydrogen in C3H8? A. 8.0% B. 18.2% C. 80.0% D. 81.8% I say B

*November 8, 2012*

**math**

How is percent composition calculated? A. Dividing the mass of each element in the compound by the total mass of the compound and then dividing by 100% B. Dividing the mass of each element in the compound by the total mass of the compound and then multiplying by 100% C. ...

*November 8, 2012*

**math**

What is one mole of H2O composed of? A. 2 hydrogen atoms and 1 oxygen atom B. 2 × (6.02 × 1023) hydrogen atoms and 6.02 ×1023 oxygen atoms C. 3 atoms of water and 2 oxygen molecules D. one half of a molecule of peroxide I say A

*November 8, 2012*

**math**

If there is a 75.0 g quantity of carbon present in each 100 g of a carbon and hydrogen compound, what is the percent composition of hydrogen in this compound? A. 25 g B. 25% C. 75 g D. 75% I say B

*November 8, 2012*

**math**

What is the percent by mass of oxygen in H2O? A. 11.1% O B. 50.0% O C. 88.9% O D. 95.0% O I think C

*November 8, 2012*

**math**

Convert 1,144 oF to oC A. 617.8 B. 617.8 oC C. −617.8 oC D. −617.8 I say B

*November 7, 2012*

**math**

Solve the following and express the answer in scientific notation:(3.5 x 10^6 / (4.2 x 10^8) A . -8.3 X 10^-3 b. 8.3 X 10^3 c. 8.3 X 10^-2 d. 8.3 X 10^-3 I say A

*November 7, 2012*

**math**

Solve the following and express the answer in scientific notation: 10^3 x 10^4. A. 10-^1 B. 10^1 c. 10^6 D. 10^7 I say D

*November 7, 2012*

**math**

To add numbers using scientific notation, multiply the coefficients and then add the exponents. true or false true

*November 7, 2012*

**math**

Solve the following and express the answer in scientific notation: (5.4 x 10^4) - (2.5 x 10^6) A. -2.45 x 10^6 B. 2.45 x 10^6 C. -2.45 x 10^8 D. -2.44 x 10^2 I say D

*November 7, 2012*

**math**

Solve the following and express the answer in scientific notation: 10^3 x 10^4 x 10^-2 A. 10^5 B. 10^6 C. 10^7 d. 10^8 I say A

*November 7, 2012*

**math**

Solve the following and express the answer in scientific notation: (5.3 x 10^4) + (2.2 x 10^3) A. 5.5 x 10^4 B. 7.5 x 10^3 C. 7.5 x 10^7 D. 11.7 x 10^7 I say A

*November 7, 2012*

**math**

The melting point of helium is -272.2 oC. Express this temperature in kelvins. A. -272 K B. -8.0 K C. 0.8 K D. 545 K I say D.

*November 7, 2012*

**math**

what is the mass of 1.00 L of ethanol? Ethanol has a density of 0.798 g/ml. (hint: one liter is 10^3 mL.) A. 0.789 g B. 789 g C. 789 L I think C

*November 7, 2012*

**math**

what is the mass of 12.0 ml of a substance with the density of 0.922 g/cm3? A. 1.11g B. 0.11g C. 11.1 g I think C.

*November 7, 2012*

**math**

what is the specific gravity of a substance that has a density of 1.59 g/cm3? A. 1.59 g/mL B. 1.59 g C. 1.59 D. 1.59 mL I think B.

*November 7, 2012*

**math**

if the density of .88 grams of mercury is 13.6 g/ml, what is the volume? A. 0.065 mg B. 0.065 C. 0.065 ml D. 0.065 L I think its C.

*November 7, 2012*

**math**

If melted butter were poured into a glass of milk and allowed to rest, two distinct layers would be visible. How would these layers appear? A. The melted butter would lie above the layer of milk because butter is less dense than milk. B. The melted butter would lie above the ...

*November 7, 2012*

**math**

If the density of 1.77 grams of gold is 19.3 g/mL, what is the volume

*November 7, 2012*

**math**

think its 13.6 g

*November 7, 2012*

**math**

Mercury has a density of 13.6 g/cm^3. What is the specific gravity of mercury? A. 13.6 g B. 13.6 cm C. 13.6 cm^3 D. 13.6

*November 7, 2012*

**math**

In scientific notation, a number is written as the product of a coefficient and the number 10 raised to a power. True False

*November 6, 2012*

**math**

Solve the following and express the answer in scientific notation: (5.4 × 10^4) × ( 4.5 × 10^8)

*November 6, 2012*

**english**

The following sentence shows what element of poetry? Her fiery eyes swept away his heart. A. Imagery B. Figure of speech C. Personification D. Simile

*October 16, 2012*

**english**

What word best describes the Realist's and Modernist's perspective on the world? A. Objective B. Passionate C. Subjective D. Unemotional

*October 16, 2012*

**english**

Which literary movement consists of honest and open descriptions the setting and characters? I say B. A. American Modernism B. American Realism C. American Romanticism D. American Transcendentalism

*October 16, 2012*

**MATH**

WHAT IS THE SUM OF ALL THE DISTINCT, POSITIVE PRIME FACTORS OF 1260

*September 11, 2012*

**5th grade Math**

6+10*2

*February 29, 2012*

**Chemistry**

Calculate the theoretical pH at the starting point and at each equivalence point for phosphoric acid, acetic acid, and sulfuric acid. Please show the equilibrium equation, the Ka, and the pH calculation.

*December 12, 2011*

**Chemistry**

Develop a recipe for 1.00L of pH 4.50 buffer using only 17.4M HC2H3O2 and 3.00M NaOH (and deionized water). Be sure that it can accommodate an addition of at least .50 mol of strong acid or base with a change in pH less than/equal to 1.

*December 12, 2011*

**Physics**

Find the angle that the vector R = A + B makes with the positive x axis, use counter- clockwise as the positive angular direction, between the limits of −180 degrees and +180 degrees. Answer in units of degrees

*November 18, 2011*

**Chemistry**

A 30.00mL sample of 0.150M KOH is titrated with 0.125M HClO4 solution. Calculate the pH after the following volumes of acid have been added: 30.0 mL, 35.0 mL, 36.0 mL, 37.0 mL, 40.0 mL

*November 17, 2011*

**statistics**

if a data set has mean 70, and standard deviation 5, is 80 asuspect outliner/

*September 15, 2011*

**Social Studies**

Okay, thank you

*September 15, 2011*

**Social Studies**

I am an investor in the Virginia Company. What is a reason of why people should leave England and move to Jamestown. What are the two advantages of living in Virginia? Thank you.

*September 15, 2011*

**Literature (Vocabulary)**

charlatan naïve hoax amicable levity fickle mundane

*April 26, 2011*

**math**

6.8 in fraction notation

*March 13, 2011*

**Math 11th grade**

How to solve system of equations 5a=5 6b-3c=15 2a+7c=-5

*October 11, 2010*

**science**

i don't know can you please help it is an summative from 32 please

*September 27, 2010*

**Chemistry 143**

Write three thermochemical equation needed to calculate delta H for the following reaction: 2Mg(s) + O2(g) = 2MgO Include delta h values in kJ for each reaction. Please help!! I don't even know were to start!!

*April 26, 2010*

**Chemistry for the life sciences**

If i combust 1.0kg of octane according to the following unbalanced reaction , how many moles of carbon dioxide should i theoretically produce? 2 C8H18+ 25 O2 -> 16 CO2+ 18 H20

*April 20, 2010*

**algebra**

Trains a and b are traveling in the same direction on parallel tracks. Train a is traveling at 40 mph and train b is traveling at 50mph. Train a passes a station at 12:15 a.m. If train b passes the same station at 12:27a.m. at what time will train b catch up to train a??

*April 14, 2010*

**Writing**

31 Myself 32 who 33 they/their 34 they /their

*March 14, 2010*

**Writing**

31 Myself

*March 14, 2010*

**math**

6+10*2 the expression equal 32

*November 2, 2009*

**math**

3+5*2-210=6

*November 2, 2009*

**spanish**

what dose tengo sed puedo ira

*September 10, 2009*

**9th grade**

what are energy bar graphs?

*March 13, 2009*

**math**

My friend found two old watches. He wound them, set them, and started both of them at the same time. He placed the two old watches on one wrist and his new watch on the other wrist. Forty-five minutes later one of the old watches had gained 1 minuate and the other old watch ...

*March 5, 2009*

**history**

i need help on history project is anyone alive in here

*February 22, 2009*

**history**

ok hi

*February 22, 2009*

**math**

a pickup truck has a main tank with a 17 3/4 gallon capacity and an auxiliary tank which holds 15 1/8 gallons. if the truck gets 14 6/10 mpg, how far can the truck trqavel before running out of gas?

*July 28, 2008*

**English**

give me an example ofrhetorical statement with explanation ?

*June 15, 2008*

**science**

Does flowers store food?

*February 25, 2008*

**Word Problem**

Help! I still cant figure this out. 742.50-.0225x = 33000. Is this correct so far? Thank you!

*September 10, 2007*

**Word Problem help!!**

Can someone help me figure out the equation? I am not good at figuring this out. Investing her bonus. Donna invested her $33,000 bonus and received a total of $970 in interest after 1 year. If part of the money returned 4% & the remainder 2.25%, how much did she invest at each...

*September 10, 2007*

**Word Problem**

Thank you for helping me understand how to do these questions! You are wonderful!

*September 10, 2007*

**Word Problem**

Can someone help me figure out the equation? I am not good at figuring this out. Investing her bonus. Donna invested her $33,000 bonus and received a total of $970 in interest after 1 year. If part of the money returned 4% & the remainder 2.25%, how much did she invest at each...

*September 10, 2007*

**Algebra**

Graph the absolute value inequalities. I just can not get this. Please help! x + 2y ¡Ý 6

*September 10, 2007*

**College Algebra**

Could you please help me with this problem? We are to graph each compound inequality. x ¡Ý -2y and x - 3y < 6

*September 10, 2007*

**Juvenile Delinquency**

Compare the adolescence period in the United States with that of other nations. Compare and contrast any ritualistic (rites of passage) behavior used by both Americans and foreign children. Please re-post and include the answer or response you have come up with so far. ...

*November 11, 2006*

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