# 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?

**business calculus**

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**

no

**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 ...

**chem 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!

**chem HELP PLEASE**

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!!