Posts by shana

Total # Posts: 105

algebra PLEASE help
Bob and Doug play a lot of Ping-Pong, but Doug is a much better player, and wins 90% of their games. To make up for this, if Doug wins a game he will spot Bob five points in their next game. If Doug wins again he will spot Bob ten points the next game, and if he still wins the...

algebra
Bob and Doug play a lot of Ping-Pong, but Doug is a much better player, and wins 90% of their games. To make up for this, if Doug wins a game he will spot Bob five points in their next game. If Doug wins again he will spot Bob ten points the next game, and if he still wins the...

Linear algebra
please help :( Bob and Doug play a lot of Ping-Pong, but Doug is a much better player, and wins 90% of their games. To make up for this, if Doug wins a game he will spot Bob five points in their next game. If Doug wins again he will spot Bob ten points the next game, and if he...

Linear algebra
Suppose that the sequence x0, x1, x2... is defined by x0 = 1, x1 = 5, and xk+2 = 3xk+1+10xk for k?0. Find a general formula for xk.

cell biology
How can we differentiate MMPs from different proteolytic enzymes

Linear algebra
Find all complex numbers z satisfying z3 = 27i and give your answer as a comma-separated list of values in the form a+bi.

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?.

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).

Algebra
Thank you so much

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.

Algebra
can anybody help me with this question please? Let L be the line passing through the point P=(5, −5, 3) with direction vector →d=[1, −3, −2]T. Find the ...

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 ...

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 ...

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.

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

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.

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.

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

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?

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??

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)

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?

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

science
probably , the answer is D

Math
32.04 x300

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

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

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

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

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

CURRENT PROCD TERMN CODING
wHAT IS THE CODING SYSTEM PHYSICIANS USE TO FILE THEIR CLAIMS

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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. ...

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

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

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

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

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

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

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

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

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

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

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.

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

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.

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.

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.

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 ...

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

math
think its 13.6 g

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

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

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

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

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

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

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

5th grade Math
6+10*2

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.

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.

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

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

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

Social Studies
Okay, thank you

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.

Literature (Vocabulary)
charlatan naïve hoax amicable levity fickle mundane

math
6.8 in fraction notation

Math 11th grade
How to solve system of equations 5a=5 6b-3c=15 2a+7c=-5

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

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!!

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

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??

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

Writing
31 Myself

math
6+10*2 the expression equal 32

math
3+5*2-210=6

spanish
what dose tengo sed puedo ira

9th grade
what are energy bar graphs?

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 ...

history
i need help on history project is anyone alive in here

history
ok hi

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?

English
give me an example ofrhetorical statement with explanation ?

science
Does flowers store food?

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

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...

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