Thursday
March 23, 2017

# 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

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

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

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

How to solve system of equations 5a=5 6b-3c=15 2a+7c=-5
October 11, 2010

science
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

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

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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