# Posts by jo

Total # Posts: 490

physics
A hunter wishes to cross a river that is 1.0 km wide and that flows with a speed of 4.9 km/h. The hunter uses a small powerboat that moves at a maximum speed of 9.6 km/h with respect to the water. What is the minimum time necessary for crossing?

math
sum of 3 number is equal 39 , the second number is half of third number ,and the first number less than third number by 1,the result must be 6 degit ?

geometry
Two rectangles are similar. If the height of the first rectangle is 3 inches, and the height if the second rectangle is 9 inches, how much larger is the second rectangle's area?

Statistics
A COMMITTEE OF 5 PEOPLE IS TO BE FORMED FROM 15 PARENTS AND 10 teachers. Find the probability that the committee will consist of at least one parent.

chemistry
which complementary functional group from dopamine would need to be present in the receptor for the interaction to occur.

chem
which complementary functional group from dopamine would need to be present in the receptor for the interaction to occur.

chemistry
i need to find the enthalpy for COF2 F2 (g) + CO (g) --> COF2 (g) i found -507 but i am not sure if it is correct

science
i need to find the enthalpy for COF2 F2 (g) + CO (g) --> COF2 (g) i found -507 but i am not sure if it is correct

research
Thank you

research
So would he research problem be: determining the effectiveness of the electronic monitoring (EM), used for serious offenders supervised in the community?

research
what is the research problem discussed in the article: UNDER SURVEILLANCE: AN EMPIRICAL TEST OF THE EFFECTIVENESS AND CONSEQUENCES OF ELECTRONIC MONITORING? I have read this and I am totally lost. Please help

Math
Given a total profit of p(x) = 1.4x-0.02x^2-20 let x represent a number of days and find profit achieved and when that profit is made

criminal justice
explain the relationship between theory and hypothesis development and testing

Chemistry
.20mol

Math
Abby has 18 blue socks and 4 white socks. How many socks does she need to pull out in order to have a matching pair of socks?

Statistics
a procedure in REGRESSION NALYSIS WHERE PREDICTOR OR INDEPENDENT VARIABLES ARE CODED AS 1 OR 0 (REPRESENTING CATEGORIES) AND CAN BE USED TO PRODUCE ANOVA TABLES UNDER THE GENERAL LINEAR MODEL IS KNOWN AS?

math
15g

physics
a stone is thrown vertically upward with a speed of 10.5 m/s from the edge of a cliff 76.0 m high. how much later does it reach the bottom of cliff? what is its speed just before hitting? what total distance did it travel

POL 201
The Tenth Amendment balances out national authority by

Mathematics
490

math
1.45-7.3

algebra 2
x + my =d

maths
find value of p such that the equation (x+1)(x+2)=p

calculus
simplify aab-3/Ba^2b-2

Chemistry
What chemical feature in the protein dictates the local secondary structure? α-helix β-pleated sheet random coils amino acid sequence pH hydrogen bonding

Chemistry
Why does the equation Co(H2O)6 + 4Cl <------> CoCl4 + 6H2O shift left when cooled?

A- 14H + 6Fe^2+ + Cr2O7^2- --> 6Fe^3+ + 2Cr ^3+ + 7H2O B- 3N2H4 +4Cl03- --> 6NO2+ 12Cl- + 6H2O This was all I was able to come up with, am I at lease headed in the right direction?

Balance the following redox reaction and identify the oxidizing and reducing agents A- Fe2+(aq) + Cr2072-(aq) -->Fe3+(aq) + Cr3+(aq) (acidic) B- N2H4(g) + ClO3-(aq) -->NO2(g) + Cl- (basic)

Calculate the molar solubility of silver chloride (AgCl) in: a-deionized water and b-.20M NaCl solution Given Ksp=1.6*10^-10

Chemistry
Balance the following redox reaction and identify the oxidizing and reducing agents A- Fe2+(aq) + Cr2072-(aq) -->Fe3+(aq) + Cr3+(aq) (acidic) B- N2H4(g) + ClO3-(aq) -->NO2(g) + Cl- (basic)

chemistry
Calculate the molar solubility of silver chloride (AgCl) in: a-deionized water and b-.20M NaCl solution Given Ksp=1.6*10^-10 please show work.

CALCULUS
Let the line l0 be defined by x = 1−t, y = 2+3t, z = 1−2t. Determine whether each given line intersects l0. If it does, give the intersection point. l1 :x=2+t, y=5−2t, z=1+3t l2 :x=6+2t, y=1+t, z=5+t

books
I need to write a Year 9 English Unit on the novel,"Strange Objects" by Gary Crew. I can't seem to find any resources to assist me. Can you help direct me to finding some???? thanks

CHEMISTRY
Suppose a student adds 25.00 mL of 1.025 M HCl to a 1.50 g antacid tablet. The student boils and then titrates the resulting solution to the endpoint with 0.4969 M NaOH. The titration requires 21.3 mL NaOH to reach the endpoint. How many moles of HCl were neutralized by the ...

CHEMISTRY
If a tablet contains 129 mg of Mg(OH)2 and 505 mg of CaCO3, how many moles of HCl would theoretically be neutralized?

Chemistry
You titrate a 10.0 mL sample of phosphoric acid with a 1.65 M solution of the base potassium hydroxide. It takes 7.55 mL to reach the endpoint of the titration. What is the molar concentration of the original solution of phosphoric acid? 3KOH + H3PO4 --> K3PO4 + 3H2O

Chemistry
A 10 mL sample of 1.5 M Potassium Phosphate is placed in a 100 mL volumetric flask and diluted to the mark. What is the Molar concentration of Potassium ions in this diluted solution?

chemistry/science
That is the question that I was given for homework and it stumped me also. Is it possible that the answer is transition metals. I looked on the periodic chart and found that that is what was possibly inside it. I am confused. Wondering if you could clarify the answer??

chemistry/science
What are the groups of atoms inside iron called?

physics
A slide is 5 inches high. it is placed 5.5 inches from the convex lens of a porjection lantern. The image is cast upon a screen 55 inches away. the focal length of the lens is ______inches? b) the heigh of the image cast by the lens is ________inches?

Algebra 2
Sidewalk of uniform width has area of 180 ft squared and is surrounded ny a flower bed that 11 ft wide and 13 ft long. Find the width of the sidewalk?

ecology
During the demographic transition of the eighteenth century, humankind led advances in mortlity and economy, leading to a prosperous population growth. What types of resources are necessary for population change and how might the availability of resources in different ...

sociology
There is a disparity between theory and direct observation. Because theories are based on observations, how are these theories first developed in the absence of direct observations?

chemistry
A sample of chlorine gas is collected by water displacement at 23C. If the atmospheric pressure is 751 torr, what is the partial pressure due to the chlorine?

chemistry
To raise the temperature of 200.8 g of water from 50.00 °C to 60.00 °C requires how much heat?

algebra
lura has 4 yards of material.she is making clothes for her doll. each dress requires 1/6 yards of material. how many dresses will she be able to make?

math
A piece of cardboard measure 12ft by 12ft. Corners are to be cut from it as shown by the broken lines, and the sides folded up to make a box with an open top. What size corners should be cut from the cardboard to make a boxx with the greatest possible volume.

science
What is the term used to describe making older buildings more resistant to earthquakes?

3.duermo 4.devuelve 5.podemos 6.cuentan 7.cuestan 8. vuelve 9.encuentras 10. almorzamos Your answers are correct

math
i am trying find out how you would find the height of a rectangular prism if the surface area is 100 and length is 10 and width is 6. if someone can get me started on the right way it would help ?

CRT205
I am having difficulty finding/locating the rhetorical devices within the article. This assignment has really stumped me ... :-/

CRT205
Option 1: Article Review Choose one newspaper editorial and one magazine article from the lists provided by your instructor and write a 250- to 350-word response to the following: • What rhetorical devices are found in each article? • Based on their characteristics, ...

Algebra Problem Solving
Denise's cell phone plan is \$29.95 per month plus \$.10 per minute for each minute over 300 minutes of call time. Denise's cell phone bill is \$99.95. For how many minutes was she billed? Answer is 700 but what is the algebraic equation?

Math
There are18 boys and 20 girls in a class. What is the ratio of girls to boys?

math
i need someone to show the formula for this problem and amswer i have 16 not sure sally's art project is in the shape of a circle. she wants to put a piece of glitter string around the adge of her project has a radius of 4 inches, how much string will she need?

the facility study unit
aesthe tics is concemed with matters such

Statistics
1,2,4

math
The sale on a map is 1 inch=12 feet. What is the actual distance between two points that are are 8 1/2 inches apart

geometry
Three security cameras were mounted at the corners of a triangular parking lot. Camera 1 was 151 ft from camera 2, which was 122 ft from camera 3. Cameras 1 and 3 were 139 ft apart. Which camera had to cover the greatest angle?

Algebra 2
How do i get the perfect square of: 3x^2+7x=-9

Division
If you have 43 marbles. You divide them equally among some sacks. How many sacks must you use to get fewer than 8that marbles in each sack?

Division
If you have 43 marbles. You divide them equally among some sacks. How many sacks must you use to get fewer than 8that marbles in each sack?

math
help me with missing number input 1 2 3 4 5 output, 2 , 5, 10, ?,26

physic
final=22.4J 22.4J/ 61.3J (initial)

chemistry
420

chemisty
NaOH + HCl -> NaCl + H2O What is the molarity of a NaOH solution that required 31.6mL to neutralize 25.0mL of a 0.145 M HCl solution?

chemisty
12.00 liters of oxygen gas is under a pressure of 20 mm Hg. If the volume of this gas is decreased to 2.00 liters at constant temperature, what will the new pressure be? I believe this is Boyle's law and the answer should be 120 mm Hg, but according the answer on practice ...

chemistry
12.00 liters of oxygen gas is under a pressure of 20 mm Hg. If the volume of this gas is decreased to 2.00 liters at constant temperature, what will the new pressure be? I believe this is Boyle's law and the answer should be 120 mm Hg, but according the answer on practice ...

chemistry
Reaction: Na2CO3 + 2 HCl -> 2 NaCl + CO2 + H2o How many grams of NaCl can be produced from the reaction of 1.35g of Na2CO3 with 125mL of 0.265 M HCl?

CHEMISTRY
Cant figure this out, I feel like the answer I keep getting is way too low. A voltaic cell is constructed that is based on the following reaction: Sn2+ (aq) +Pb(s) = Sn(s) + Pb2+ (a) If the concentration of Sn2+ in the cathode compartment is 1.00M and the cell generates an emf...

Chemistry
THANK YOU!

Chemistry
Hi everyone, I have been trying to figure out this titration equation all day and for some reason I am stumped. Here is the question in full: Potassium hydrogen phthalate, KHP, can be obtained in high purity and is used to determine the concentrations of solutions of strong ...

Language
What part of speech are the following words this, of, books, sighed, heavily, doctor,ask, you, address, auscultated, are, bruits, read, last, and, my, will follow up, yesterday, tomorrow, gift, call it, present, always, on

Pre-calculus
A sailboat leaves port and sails for 7 miles NE and then 9 miles NW. If the speed remains constant, what bearing would take the sailboat home?

Dimension Personal Education
Junior plan to travel this summer with Oscar and I

Math
A farmer has 20 pigs ans sheep.he has 6 fewer sheep than pigs. How many pigs does he have?

Chemistry
Answer is 1.104L Oh remember that there are 0.028 mol in 1.88g of NaN2. Final, in 0.028mol of NaN3, there is 0.042 mol of N2. This is your n. so, V= ( nRT)/P remember, you are given R, T and P Hope this helps:)

Chemistry

HOW TO STARE YOUR DAY CARE FACILIY
THE LARGEST NON PROFLT ASSOCIATION IN THE UNITED STATES REPRESENTION EARLY CHILDHOOD EDUCATION IS THE

chil development
keeping systematic record of observations of children provid useful information for

Yes,yes :)

math
Can you show 2 hundredths using only tenths place value blocks?

child development
agood technique to prevent children from talking to you while you,re observing is to.

Biology
Inducible

world history
Conversion of kings and other elite figures

Physics
12

Shelving units
The average thikness of a medical chart is 1/4 inch. If a practice has 1200 patients with each chart 1/4 inch thick, how many shelving units will it take if a unit can hold 368 inches.

AP chemistry
32.0102

math
there Are four children in a family, the sum of the squares of the ages of the three youngest children equals the square of the age of the oldest child. How old are all the children.

Calc
A paper cup is to be designed in the shape of a right circular cone. It must have a capacity of 12 fluid ounces (1 fluid ounce = 1.80469 cubic inches) of soft drink but it must use a minimum amount of material in its construction. What should the dimensions of this paper cup ...

Chemistry
Use Ksp to find the concentration of an ion in a saturated solution. Consider a 2.50E-3 M solution of Al2(SO4)3. (a) What [OH^-] is required to initiate precipitation of Al^3+ from the solution? (b) What [OH^-] is required to lower the [Al^3+] to 2.00E-7 M ?

Chemistry
Given a diprotic acid, H2A, with two ionization constants of Ka1 = 3.9× 10–2 and Ka2 = 5.9× 10–8. Calculate the pH and molar concentrations of each protonated form for a: (a)0.135 M solution of H2A pH= [H2A]= [HA]= [A2-]= (b)0.135 M solution of NaHA pH= [...

Chemistry
I'm not getting the right answers for the pH, [H2A], and [HA^-] in part a (0.135 M solution for H2A) For H2A, I did 3.9E-2=x^2/(.135-x) Using the quadratic formula: x^2+.039x-.005265=0 x=.06725 [H^+]=[HA^-]=.06725 M pH=-log(.06725)=1.17 Finding [H2A]=.135 M-.06725 M=.06775...

Chemistry
Given a diprotic acid, H2A, with two ionization constants of Ka1=3.9E-2 and Ka2=5.9E-8. Calculate the pH and molar concentration of each protonated form for a 0.135 M solution of: (a) H2A (b) NaHA (c) Na2A

algebra
equivalent expression for 2log(x+1)-2log(x-1)-log(x-1)

science
two tall buildings are 200m apart .with what speed must a ball be thrown horizontally from the window 540 m above the ground in one building, so that it will enter a window 50m above the ground in the other?

statistics
how large a sample size is needed for 2 sided 95% confidence interval to have a length of 2 weeks when mean is 3.6

physics
a missile is launched an angle of 26.5 with respect to the horizontal. if it travels in the straight line over the level Terran for 2 minute and its average speed is 6000 mile per hour. what is its altitude?

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