# Posts by HELP!!!

Total # Posts: 87

**math**

Two vertices of a triangle lie on some line. The third vertex belongs to the line that is parallel to the first one. Prove the area of that triangle does not depend on the position of the third vertex on the line.

**math**

The quadrilateral ABCD has area of 58 in2 and diagonal AC = 14.5 in. Find the length of diagonal BD if AC ? BD.

**LESSON 12 Social Studies 8 B Unit 3: Reconstructi**

Why might recent events led to many African Americans working for ranches? A. During the civil war, many African Americans went west to work on rairoads. B. After the end of slavery, African Americans could move and find work. C. In the 1850's many African Americans from ...

**Math**

1. There are 14 blue marbles, 8 red marbles, and 12 green marbles in a jar. What is the ratio of the total number of marbles to the number of red marbles? (1 point) 24:8 34:8 8:34 8:24 2. Which of the following ratios is equivalent to fifteen over twenty ? (1 point) 200 to 150...

**physics**

A basketball explodes into three separate pieces. Two pieces of equal mass shoot off at 20.3 m/s, one travelling to the south and one to the west, perpendicular to each other. The third piece has a mass 4 times the size of one of the other pieces. What is the speed of the ...

**Math**

Write the ratio of dogs to cats in simplest form. 12 dogs, 16 cats

**Math**

If the scale factor is 2.5” = 3 ft, what is the area of the room in the real world?

**Math**

Explain the relationship among input, output, and function rule.

**pre algebra**

Which polynomial does the model represent? and then it has one big black block, 2 thin white blocks, 3 thin black blocks, 3 single white cubes, and one single black cube. Please help ASAP!!!

**Math!!!**

A 3 x 5 table is considered to test the association of two variables having 3 and 5 categories respectively. A Chi-square test statistic with value 19.0 was obtained. What is the degrees of freedom associated with this test?

**Algebra**

a factory can produce two products, x and y with a profit approximated by P=14x+22y-900. the production of y can exceed x by no more than 100 units moreover production levels are limited by the formula x+2y,+1,400. what production levels yield maximum profit?

**Language Arts**

@help! Did you get the answers?

**Algebra**

A recipe for a home-made disinfectant calls for adding one-half cup of clorox to one gallon of water. Mrs. Jenkins wants to make this solution in a 32-ounce spray bottle. How many fluid ounces of clorox should be added to 32 fluid ounces of water to have the same clorox-to-...

**Math**

I don't know how to do the 5% and 2% thing.I got the whole pirce though

**Math**

What was the total grocery bill? Mrs. Sanders did a lot of shopping at several stores in preparation for Thanksgiving next week. These are the items that she bought at Kroger: One 19.5 turkey @ $0.89 per pound 5 pounds of sweet potatoes @ $0.59 per pound 2 packages of frozen ...

**Algebra**

Rachel sent or received 10,290 text messages in the month of September. If each text message over the first 150 messages cost 8 cents, what was her texting bill? $126,750 Explain how you got your answer. I subtracted 10,290 by 150 then I divided 10,140 by 0.08 and I got 126,...

**Math**

for the second one i got 20.1764705882 can you plz check it

**Math**

Rachel sent or received 10,290 text messages in the month of September. If each text message over the first 150 messages cost 8 cents, what was her texting bill? Explain how you got your answer. Assuming that she slept 7 hours each day, what was the average number of text ...

**Math**

Oh yeah thank you again

**Math**

Why is it 6x+2y-3 isnt it supposed to be 4x+3

**Math**

Thank you

**Math**

Six times a number x plus 2 times a number y is 3 more than 4 times a number x. Solve for x. Sorry i messed up on that on this is supposed to be the right question

**Math**

Six times a number x plus 2 times a number y is more than 4 times a number x. Solve for x.

**Math**

A boat can go 20 miles against a current in the same times that it can go 60 miles with the current. The current is 4 miles per hour. Find the speed of the boat with no current.

**PHYSICS**

Two capacitors C1 = 7.00 µF and C2 = 11.0 µF are connected in series to a 9.00 V battery. (a) Find the equivalent capacitance of the combination. µF (b) Find the potential difference across each capacitor. (c) Find the charge on each capacitor.

**PHYSICS**

An air-filled capacitor consists of two parallel plates, each with an area of 7.60 cm2, separated by a distance of 1.70 mm. (a) If a 16.0 V potential difference is applied to these plates, calculate the electric field between the plates. kV/m (b) What is the surface charge ...

**MATHS**

Let N be the number that consists of 61 consecutive 3's. Let M be the number that consists of 62 consecutive 6's. What is the digit sum of N×M? Details and assumptions The digit sum of a number is the sum of all its digits. E.g. the digit sum of N is 3+3+3+…...

**MAThs**

Six children are standing along the x-axis at points (0,0), (17,0), (40,0), (85,0), (173,0), (440,0). The children decide to meet at some point along the x-axis. What is the minimum total distance the children must walk in order to meet?

**MATHS!!!Please HELP..:'(**

What is the coefficient of x^4 in (x^2−x−2)^7?

**physics**

A pellet gun fires ten 3.00 g pellets per second with a speed of 840 m/s. The pellets are stopped by a rigid wall. What is the average force (in newtons) exerted by the pellets on the wall?

**physics**

A 8.30 kg object with a speed of 34.0 m/s strikes a steel plate at an angle of 45.0 degrees with the normal to the plate, and rebounds at the same speed and angle on the other side of the normal. What is the change (in magnitude only) of the linear momentum of the object (in ...

**physics**

Children slide down a frictionless water slide that ends at a height of 1.80 m above the pool. If a child starts from rest at point A and lands in the water at point B, a horizontal distance L = 2.43 m from the base of the slide, determine the height h of the water slide.

**physics**

If a car takes a banked curve at less than the ideal speed, friction is needed to keep it from sliding toward the inside of the curve (a real problem on icy mountain roads). (a) Calculate the ideal speed to take a 105-m radius curve banked at 13.0°. km/h (b) What is the ...

**physics**

As shown in the figure below, a stick of length L = 0.330 m and mass m = 0.205 kg is in contact with a rough floor at one end and a frictionless bowling ball (diameter d = 21.50 cm) at some other point such that the angle between the stick and the floor is θ = 30°. ...

**physics**

A 0.330-kg block of wood rests on a horizontal frictionless surface and is attached to a spring (also horizontal) with a 29.5-N/m force constant that is at its equilibrium length. A 0.0600-kg wad of Play-Doh is thrown horizontally at the block with a speed of 3.00 m/s and ...

**health**

A mutual consent registry is relevant to obtaining medical information about what?

**Chemistry**

A mixture of gases contains 0.4 mole of N2, 0.5 moles of O2, and 0.7 moles of H2. What is the total pressure if partial pressure of O2 is 1.3 atm?

**Math**

A person travels 32 meters,turns right & travels 34 more meters. It took 3 minutes. What is her speed?

**math**

Put these in order from least to greatest: 13/16, 5/8, 3/16, 3/4, 7/8.

**math**

thanks i understand!

**math**

Mark has a square shaped tulip bed in his garden. The area of the tulip bed is 400 square feet. Mark wants to put a low border fence around the tulip bed. Explain how to find the number of feet of fencing that he will need.

**math**

Put these in order from least to greatest: 13/16, 5/8, 3/16, 3/4, 7/8.

**Calculus**

Derive the integral of cos^n (x) dx= (1/n)cos^(n-1) (x) sin(x)+((n-1)/n)(integral of cos^(n-2) (x) dx

**engineering**

The 50-kg stone has a speed of v_A = 8m/s when it reaches point A.Determine the normal force it exerts on the incline when it reaches point B. Neglect friction and the stone's size.

**physics**

A 300 lb bungee jumper wants to jump from the top of a 230 ft high bridge and be able to just touch the water below (Part A figure) . Given that the bungee cord has a spring constant of 11.1 lb/ft, what should the bungee cord's relaxed length, l, be for this jump?

**programming**

Thanks!

**programming**

I need to do this but I don't know how to start! I'm so bad a this class, and I'm just taking it because is a required! Please help! Write an algorithm that solves tax calculation problem.

**math**

Thank You Ms.Sue, You're AWESOME!!!!

**math**

+3-(-3)-(-7)= please explain how you got the answer

**math**

thank you Ms.Sue

**math**

The area of each of the four states shown of the united states is given as fractions, decimals or percents of the total area of the united states. Arrange the states in order from the largest area to the smallest area. California-4.25% Montana-1/30 New Mexico-0.072 Texas-9/125

**Math**

Dominic was 8 years old when his sister was born. Now the sum of their ages i 56. How old is Dominic now?

**history**

thank you so much!!!!

**history**

what were some aspects of the ten percent plan?

**history**

.How did the battle between the Monitor and the Virginia change naval warfare?

**Chemistry**

Both calcium sulfate and magnesium sulfate can form hydrates with water. Could white anhydrous CaSO4 or MgSO4 be substituted for anhydrous CuSo4? Why or Why not?

**Chemistry, Algebra**

so you have to find the percentage moisture loss

**Chemistry, Algebra**

A baker uses dried skim milk that contains 3.0% moisture and costs $1.16 per lb, which on a moisture free basis would be $1.20 per lb. If liquid skim milk containing 90.5% water costs $1.60 per gallon (8.64 lbs), what would be the comparative cost of 1lb. dry solids from the ...

**Chemistry**

I got the first part when I have to find the ratio for base to acid. I didn't know where to go from there. I tried using the C1V1=C2V2 equation but again I am lost.

**Chemistry**

How would you prepare 1L of a .050 M phosphate buffer at pH 7.5 using crystalline K2HPO4 and a solution of 1 M HCl? pka of H2PO4 = 7.2

**physics**

compared to the period of a wave of red light the period of green light is... A)less B)greater C)the same D)none of the above

**chemistry**

How many total atoms are in 1.0 moles of H2O ?

**chemistry**

Convert 3.01 x 1023 molecules of C2H6 to moles.

**chemistry**

How many atoms does 2.0 moles of He represent?

**Chemistry**

Hydrogen peroxide, H2O2, solution can be purchased in drug stores and used as an antiseptic. A sample of such a solution weighing 1.00 grams was acidified with sulfuric acid and titrated with .02000 M solution of KMnO4. The unbalanced reaction is H2O2(aq) + MnO4-(aq)--> O2(...

**chemistry**

Calculate [Fe^2]+ when the cell reaction reaches equilibrium? A voltaic cell is constructed based on the following reaction and initial concentrations: Fe^2+,( 0.0050 M ) + Ag+,( 2.5 M ) ----> Fe^3+,( 0.0050 M ) + Ag(s)

**chem**

umm i tried it,,yet im getting the wrong answer.. this is wht i did: M1 X V1= M2 X V2 V1 = M2 X V2 ---------- M1 = 2.45 X 0.65 ------------ 0.65 = 259.365 ml

**chem**

ok thank u

**chem**

A particular household ammonia solution (d= 0.97g/mL) is 6.8% NH3 by mass. How many milliliters of this solution should be diluted with water to produce 650 mL of a solution with pH = 11.55?

**chem**

thanks alot !! =)

**chem**

How many milliliters of a 15.0%, by mass solution of {KOH}(aq) (d = 1.14 g/mL) are required to produce 25.0 L of a solution with pH = 11.60?

**CHEM**

A particular household ammonia solution (d= 0.97g/mL) is 6.8% NH3 by mass. How many milliliters of this solution should be diluted with water to produce 650 mL of a solution with pH = 11.55?

**chem**

Arrange the following amines in order of decreasing base strength. NH3, NH2Br, CH3NH2, (CH3)2NH

**chem**

my y = 2.25*10^-5 n what do i do

**chem**

what is the pH of an aqueous solution that is 0.123M NH4Cl

**chemistry**

im still not getting the answer right!!! =( n it ws my mistake...the concentration is 0.120M

**chemistry**

initail 0.120M 0M 0M change -2X X 2X equilbrium (0.120-2X) X 2X Kc= [Pb^2+] [Cr^2+]/ [Cr3+] 3.2x10^-10 = 4x^3/ (1.20-2x_^2 x= 1.048x10 ^-4 n thn i kno i hv 2 substitude in 'x' im jus hving probs wid the calculation part..plz help asap..as tis stuff is due 2moro in d ...

**chemistry**

Lead metal is added to 0.100M Cr3+(aq) Pb(s) + 2Cr3+(aq) -> Pb2+(aq) + Cr2+(aq) What is [Pb3+] when equilibrium is reached? What is [Cr2+] when equilibrium is reached? What is [Cr3+] when equilibrium is reached? i solved it buh for sum reason am not getting d correct answer...

**Chemistry**

The complete combustion of 0.100 mol of CH4 in oxygen in a bomb calorimeter caused the water of the calorimeter to rise in temperature from 25.00 degrees Celsius to 37.70 degrees Celsius. Suppose that the combustion of the 0.1 mol of CH4 was instead run at constant pressure (1...

**Algebra**

A cell phone company offers a contract which cost C, in dollars, of t minutes to telephoning is given by C=0.25(t-400)+57.95, where it is assumed that t is greater than and equal to 400 minutes. what times keep cost between $98.95 and $138.95? For the cost to be between 98.95 ...

**Chemistry**

How would you find the Kb of a weak base??

**PHYSICS**

you need to move a 500 kg crate of gazelle food from the garage along the 42 meter hall to the kitchen. If you apply a force of 1000 N at a 37 degree angle to the horizontal. How long will it take to move to the kitchen?(coefficient of static friction=.15, coefficient of ...

**Science**

A sneeze causes you to mementarily shut your eyes. If this process takes 0.5s and you are moving at 30km/h, how far will you travel in that time?? PLEASE SHOW STEP BY STEP because I am very confused!!

**Simple Rate of Return**

17.Pid has invested in a machine that cost $70,000, that has a useful life of seven years, and that has no salvage value at the end of its useful life. The machine is being depreciated by the straight-line method, based on its useful life. It will have a payback period of four...

**Simple Rate of Return**

(Ignore income taxes in this problem.) Dum Luk & Stoo Pid has invested in a machine that cost $70,000, that has a useful life of seven years, and that has no salvage value at the end of its useful life. The machine is being depreciated by the straight-line method, based on its...

**U.S History**

The first two battles of the Revolutionary war were at ________ and ________. http://www.americanrevolution.com/RevolutionaryWarBattlesIndex.htm Be sure to scroll down. =)

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