# Posts by Lu

Total # Posts: 47

Math
If you are throwing a dart at the circular target pictured below, and it is equally likely to hit any point on the target, what is the probability that the dart will hit any of the small inner circles? Use 3.14 for , and round your answer to the nearest tenth. A. 6.3% B. 23.8...

Math
A penny is dropped onto a rectangular surface. If it is equally likely for the penny to land anywhere inside the large rectangle, what is the probability that all or part of the penny will come to rest inside the shaded area? Round your answer to the nearest whole percent. A. ...

Math
A circle with a central <JKL that measures 125° has a diameter of 13 feet. What is the area of sector JKL? Use 3.14 for , and round your answer to the nearest tenth. A. 46.1 square feet B. 52.5 square feet C. 85.7 square feet D. 92.1 square feet

Math
A circle with center O has a diameter of 14 feet. Points M and N are placed on the circle so that M<mon . Find the length of the intercepted MN. Use 3.14 for , and round your answer to the nearest tenth. A. 16.5 ft B. 18.2 ft C. 20.4 ft D. 33 ft

chemistry
What is the predicted change in the boiling point of water when 4.00 g of barium chloride (BaCl2) is dissolved in 2.00 kg of water? Kb of water = 0.51°C/mol molar mass BaCl2 = 208.23 g/mol i value of BaCl2 = 3 A. 0.0016°C B. -0.0049°C C. -1.0°C D. 0.015°C

Math
What is 5.6 x 10 to third power?

nutrition
Included an evaluation of nutritional risk, listing of interventions, and expected outcomes pre-eclamcia

nutrition
Included an evaluation of nutritional risk, listing of interventions, and expected outcomes

Chemistry
WHAT IS THE MAXIMUM AMOUNT OF cR2S3 IN GRAMS OBTAINABLE

physics
A cart being pulled by a 10 year old Boy with a force that is parallel to the surface. if the surface is inclined at 50° and the cart is 250kg while the surface has a coefficient of friction of 0.22 find the Normal force, Force of Friction and Force exerted by the boy

Chem
The fizz produced when an alka-seltzer tablet is dissolved in water is due to the reaction between sodium bicarbonate and citric acid: 3NaHCO3 + H3C6H5O7 -> 3CO2 + 3H2O + Na3C6H5O7 In an Experiment 1.00 g of sodium bicarbonate and 1.00g of citric acid are allowed to react? ...

Social studies
What were 2 slave states that remiand in the union after the election of 1860

algebra
A basketball player makes an average of 10 points for every 15 shots taken. Each shot made by the player is a 2-point shot. The variables in this situation are the number of 2-point shots taken and the number of points made. What is the independent variable

science
Should humans be concerned with the extinction rate? And discuss whether or not humans strive to preserve representative samples of all biomes on the planet.

re: geometry
A=5 and c=2√10, then b=?

Geometry
A=5 and c=√10, then b=?

Geometry
A=5 and c=√10, then b=?

sciology college course
A locomotive train is on its way from Chicago, IL to Madison, WI. The trip is said to last 3.15 hours. When the train arrives in Madison the conductor notices it actually took them 3.26 hours. The train company prides itself on always having its trains to the station within a ...

Algebra
wrong

Chem
I am still not understanding.

Chem
1.75 x 10^25 selenium atoms contains how many moles of selenium?

Statistics
what drawback of the standard deviation is illustrated by example?

find the slope of the tangent line y= -5x^1/2 + X^3/2; X=25

science
what is the ratio of 8gm of sugar in 500ml of water

ap history
one reason for the development of indenture employed in the early colonial period was A.a desire to produce traffic slaves B.parliaments refusal to allow skilled craftmen to emigrate C.the lack of trained domestic help on the large patroon estates along the long hudson river D...

ap history
one reason for the development of indenture employed in the early colonial period was

Central America
what is the goal of many guerillas

Chemistry
Describe how you would prepare 500 mL of a 0.0400 M solution of HCI from a concentrated soultion of HCI which is 36.5% HCI and has a density of 1.10 g/mL.

Chemistry; Stoichiometry
WHAT IS THE MAXIMUM AMOUNT OF cR2S3 IN GRAMS OBTAINABLE

english
With one foot in the door the salesman forced the homeowner to listen to his pitch.

PHYSICS
what does it mean to be outside the focal point of a converging mirror?

Chemistry
You will titrate your weak acid unknowns with a solution of NaOH of about 0.10 mol/L. The lowest molecular weight on the list of unknowns is formic acid, MW = 46.03 g/mol. Your titration volume should be between 10 mL and 50 mL. What are the smallest (first answer box) and ...

Chemistry
You will titrate your weak acid unknowns with a solution of NaOH of about 0.10 mol/L. The lowest molecular weight on the list of unknowns is formic acid, MW = 46.03 g/mol. Your titration volume should be between 10 mL and 50 mL. What are the smallest (first answer box) and ...

how do i calculate a concentration ratio of oxidised to reduced cytochrome c Fe2+ to Fe3+ given at 25 C and pH7 E(mV) as 100 and absorbance at 550nm as 1.5 E is relative to standard hydrogen electrode i don't know how im supposed to calculate it from this data please help!

how do i calculate a concentration ratio of oxidised to reduced cytochrome c Fe2+ to Fe3+ given at 25 C and pH7 E(mV) as 100 and absorbance at 550nm as 1.5 E is relative to standard hydrogen electrode i don't know how im supposed to calculate it from this data please help!!!

American History
How did the doctrine of containment and the specific programs that implemented containment help to increase Cold War tensions?

math
7+4= 11/2 is equal to 9 and 1 half hours.

American History
How did the cold War start?

college psychology
1. Describe the brain-cognition phenomenon. 2. Explain the Three-Box Model of Learning.

algebra
John is as many years older than his brother as he is younger sister if you know the age of his brother and is sister, how can you find John's age?

chemistry
What is the hybridization on carbon no. 1 and carbon no. 2? and the no. sigma bonds ? C7H10

Chemistry
I do not understand sp,sp2,sp3 hybridization. How do they form from the valence orbitals?

chemistry
what is a pi bond?

college class
a power point allows you to show visuals to a classroom which can help explain a certain topic more clearly however a pointpoint can distract and take away from the presentation foras a class may be focusing just on the screen not on your actual speaking in the presentation ...

pH scale
if a base is added to water it becomes a base just more translucent so it would be >7.

the big idea of energy
Hi. Erm.. WHAT IS THE BIG IDEA OF ENERGY??????? IRON & SULPHUR PROJECT!!