# Posts by Kai

Total # Posts: 121

**Chemistry**

A hydrate of copper (II) sulfate with formula CuSO4.xH2O has a molar mass of 250.0 g/mol. 2.545 g of hydrate is heated and 63.85% of the residue is found after heating. a) Determine the value of x in the formula of the compound b) What is the molecular formula of the hydrate?

**Math, slope**

The cost of a taxi ride is $5.00 plus $0.75 for every 0.5 km. Graph this relation Identify the slope and the vertical intercept of the line. What do the represent? Write an equation relating the cost and the distance traveled. I'm not sure how I was supposed to graph this...

**MATH!!**

Just carefully follow the words and turn them into math expressions and relationships. Since there are 2 numbers, Let x = the first number Let y = the second number x + y = 50 since their sum is stated as 50. BTW, at this point we don't know which is the bigger number. 3x...

**chemistry **

When a 8.45-mg sample of a compound containing carbon is burned completely, 18.1 mg of carbon dioxide is produced. What is the mass percentage of carbon in the compound?

**Math**

The answers dude is cream puff

**English**

Is it b

**Pure Math**

Find the complex number u=x+yi where x,y € I, such that u^2=-5+12i. HELPPPPPPP!

**Math**

Hello, can I please have help on how to find the area of a hexagon by knowing the apothem is 4 and the square root of 3? Thank you!

**PLESE HELP ME ON WALK TWO MOONS ANSWER CHECK**

igiveucorrectanswers is right i got 100%

**Social Studies**

the end of the year is here and if i don't finish this i would get a 0% on it

**Social Studies**

that dosent help...plz help

**Math help please**

here are 7 pencils and 9 pens in Jack's pencil case. Represent the number of pens to the number of pencils as a ratio.

**Language arts**

why must boys do this

**math**

A.15

**math**

2.25 or 2 1/4

**math**

That's what I thought.so will there be anything left over or is that the exact length of each piece of ribbon she uses?

**math**

julia wants to make 8 bows using 18 feet of ribbon.she wants to use an equal length of ribbon for each bow with no ribbon left over.how many feet of ribbon can she use for each bow?

**maths**

1. String P is 3 times as long as string Q so P=3Q 2. String R is 3m longer than half the total length of strings P and Q so R=300+(3Q+Q)(1/2), or R=300+2Q 3. P+Q+R=5400 4. so solving for Q, 3Q+Q+2Q+300=5400 6. 6Q+300=5400 7. 6Q=5400-300 8. 6Q=5100 9. Q=850 10. P=850x3=2,550 ...

**math**

And Gav, to be fair to Ms. Sue, you really shouldn't ask for full answers to a test. You need to post the question, give your own answer, and then someone may or may not correct on that in order to help you. I hope you aced that test though.

**math**

Mrs. Sue, I've seen you help plenty of students cheat. Do you really think that the majority of the people who come on here actually want to "learn" something? No, they don't. In all honesty, they just want a quick answer(s).

**math**

I appreciate it. Thank you!

**math**

Thank You

**math**

so the answer is 15? not 15^9 = 38,443,359,375 15^10 = 576,650,390,625

**math**

ms. Sue , why did it as how many time as great as if 15 have exponent 9 and 15 have exponent of 10 ?

**math**

How many times as great as 15^9 is 15^10 ?

**Chemistry**

Oxygen gas may be prepared by decomposing hydrogen peroxide, h2o2, using manganese (IV) oxide catalyst: 2H2O2(liquid) ----> 2H2O(liquid) + O2(gas) Calculate the amount of oxygen that will be produced from 1.35 moles of H2O2 Determine the mass of oxygen gas that can be ...

**biology**

Explain the vascular system of a lilac flower Some sites would help me very much as i cant find any that explain the vascular system of the lilac flower.

**physics**

The mass of a pendulum moves a total horizontal distance of 14cm in one cycle. What is the amplitude of the vibration?

**Financial Management**

Calculate the present value of $25,000 to be received in 5 years, assuming an opportunity cost of 10%.

**Physics help**

Add the two component vectors from Sample Problem 1 algebraically to erify that they equal the given vector The two component vectors are: 8.6m(North) and 12m (west) The given vector is 15m(West 35 degrees North)

**math 2**

his error is that the 24/6 can also be put in the set of integer #s.

**L.o**

Guys it's obvious, it's things like the secrecy bill, the editors point of view, bias, government control etc etc

**Accounting**

thanks

**Accounting**

The Divine Merchandising Corporation began March operations with merchandise inventory of 6 units, each of which cost $27. During March, Divine Merchandising made the following purchases: (1) March 4, 12 units @ $28 per unit, (2) March 15, 18 units @ $30 per unit, (3) March 26...

**Science**

Why is there such big words? I am in school and I hve learned about that lesson about all that already. I found it in my book. It was easy. You just have to take the time and read it! As a matter of fact I got a 98% of the homework. & I had only 1 person help me on one ...

**Physics**

A 5.0 Ω resistor, a 9.0 Ω resistor, and a 10.0 Ω resistor are connected in parallel across a 24.0 V battery. What is the equivalent resistance of the circuit? Answer in units of Ω

**chemistry**

2NaClO2---> 2NaCl + 3O2 if 3.85 grams of NaClO3 react, how many moles of O2 are created?

**math**

Determine whether the following argument is correct. If it's not correct, explain what is wrong with ther argument and change the minor premise to make a correct argument. If a triangle is equilateral, then it has three equal sides. Triangle ABC doesn't have three ...

**math**

Translate the following argument into symbolic form and determine wheter it's logically correct by constructing a truth table. If the team wins, then the team remains in the playoffs. If the team stays in the playoffs, then the championship is within reach. Therefore, if ...

**math**

Two lookout stations, which are 25 miles apart along the coast on a north-south line, spot an approaching yacht. One lookout station measures the direction to the yacht at N 33degrees E, and the other station measures the direction of the yacht at S 62degress E. How far is the...

**Math**

(1/9)x^3+67 at x=9 Is the answer 148 Please help

**math**

let n be the number you are looking for. 5 x sqrt(12) is the square root of n: 5 x sqrt(12) = sqrt(n) Therefore, to find n, you need to square both sides of the equation. (5 x sqrt(12))^2 = n n = 300

**math**

speed x time = distance let v be the speed of the second car We know that: (v+14) x t = 224 and v x t = 175 Let's isolate t for both equations. You get: t = 224 / (v+14) and t = 175 / v We know that t is the same for both, so: 224 / (v+14) = 175 / v Cross multiply. 224v = ...

**Math**

Match the expression: subtract 41 from 24 raised to the 6th power; then multiply by 2. Is it A. (24^6-41) x 2 Or B. 24^6-41 x 2 Or C. (24-41)^6 x 2

**Math**

Thank you

**Math**

Is it (24^6-41) x 2 Or 24^6-41 x 2 Or (24-41)^6 x 2

**Math**

Match the expression: Subtract 41 from 24 raised to the 6th power; then multiply by 2.

**Precalc**

Got it before I saw this xD thanks

**Precalc**

An investment of $37,000 was made by a business club. The investment was split into three parts and lasted for one year. The first part of the investment earned 8% interest, the second 6%, and the the third 9%. Total interest from the investments was $3030. The interest from ...

**Math**

Add d and 7 then divide by 3

**Math**

Divide18 by g. Then, subtract 7. C. 18/g-7 Is this right?

**Math**

A.(8-5) x c

**Math**

Subtract 5 from 8. Then multiply by c. Which of the. Following expressions matches the statement above? A.(8-5) x c B.(5-8) x c

**Science**

Continental crust is 100km Oceanic crust is 5km

**Science**

What fraction of the thickness of the thickest continental crust is the thickness of the oceanic crust? Give your answer as a reduced fraction.

**Physics**

haha i think i am in the same physics class with u...

**math**

16

**programming**

write a program that asks for the price of each item, and then displays the subtotal of sale, the amount of sales tax, and the total. using python.

**7th Grade Science**

Are you sure, Yui

**Finance**

12312

**algebra - correction of previously submitted. Is t**

4t^2/5=t/5+3/10 = t=3/4, t=-1/2

**math - would like to know if i did problem correct**

4t^2/5=t/5+3/10 t=3/4, t=/1/2 thank you

**math**

it is expect. thanks

**math**

Correction of problem submiited earlier. The amount P of pollution varies directly with the population N of people. City A has a population of 494,000 and produces 260,000 tons of pollutants. Find how many tons of pollution we should except City B to produce if population is ...

**Word Problem Question**

shouldn't the answer be 181,000 tons

**Word Problem Question**

I would like to know if I am correct, so far. The amount P of pollution varies directly with the population N of people. City A has population of 494,400 and produces 260,000 tons of pollutants. Find how many tons of pollution we should expect City B to produce if population ...

**algebra**

a ball is thrown downward from the too of 110 ft bldg with an initial velocity of 14ft per second. the height of ball h after t seconds is given by the equation h = -16t^2-14t +110. how long after ball is thrown will it hit the ground

**algebra**

a ball is thrown downward from the too of 110 ft bldg with an initial velocity of 14ft per second. the height of ball h after t seconds is given by the equation h = -16t^2-14t +110. how long after ball is thrown will it hit the ground

**Algebra**

*correction of previous post* Find the LCD of the rational expressions in the list. m-2/m^2+2m , -8/m^2+6m+8

**physics**

It Takes 2 N of force to get a 15 kg object to move horizontally on a surface. What is the normal force of the surface on the object?

**Physics**

I have these two equations that I'm supposed to set equal to each other and find the answer for h which is height for this problem. But I don't think I'm solving it correctly. 0 - (h/5) = -1.1(v0) - (1/2)(-9.8)(1.1)^2 (v0)^2 = 2(-9.8)(h/5 - h) My final answer was h...

**Math**

Or how do I take the derivative of that?

**Math**

what does this derivative mean? (d/dx)(d/dt)(x^2t + t^2x - 2x^3)

**Physics**

During launches, rockets often discard unneeded parts. A certain rocket starts from rest on the launch pad and accelerates upward at a steady 3.50 m/s^2. When it is 255 m above the launch pad, it discards a used fuel canister by simply disconnecting it. Once it is disconnected...

**Math (Basic)**

Oh I see. Thank you!

**Math (Basic)**

Where did you get the 15x from?

**Math (Basic)**

"A woman earns 10.00 per hour at her job, but if she works more than 20 hours in a week she is paid 1.5 times her regular salary for the overtime hours worked. One week her gross pay was 275. How many overtime hours did she work that week? Express your answer in hours to ...

**Physics (Astro)**

Oh I see. Thank you!

**Physics (Astro)**

How do you express 1.65×10^4km as a multiple of 6.38x10^6 m?

**Physics**

I think it's about sig figs for physics.

**math**

The answer is 11.

**Physics :/**

An object 3-cm high is 20 cm from a concave mirror. The focal length of the mirror is 8 cm. a. Calculate where the image is located. b. Calculate the size of the image

**mathematics**

a cyclist bikes over a path at 10 miles per hour. he returns over the same path at * miles per hour. what was his average speed for the round trip.((please explain how to do this)

**math**

seventy two .

**Physics**

Q~Q

**Physics**

A closed organ pipe 0.8 m long has a diameter of 7.0 cm. The air in the church is 15oC. What is the fundamental frequency? If the heat is turned up to 20oC, what is the new fundamental frequency? - HELPHELPHELP<3

**Algebra 1**

Thank you so much, this really helped! :)

**Algebra 1**

Question: The height in feet above the ground of an arrow t seconds after it is shot can be modeled by y = -16t(squared) + 63t + 4. Can the arrow pass over a tree that is 68 feet tall? Explain. Completely lost, could anyone help me out?

**pre-algebra**

what is x? -2x+4=3x-6

**Science**

The ____ of the cell is the control center of the cell.

**Science**

Sediment rocks are formed from _____ that are cemented and pressed together. I don't have a book to look in.

**algebra**

what is a good number sentence to show that 5 is a factor of 35?

**physics**

an antifreeze solution is made by mixing ethylene glycol (density= 1116 kg/m^3) with water. suppose that the specific gravity of such a solution is 1.0730. assuming that the total volume of the solution is the sum of its parts, determine the volume percentage of ethylene ...

**AP Chem**

What energy change is associated with the reaction to obtain one mole of H2 from one mole of water vapor? The balanced equation is 2 H2O(g) -> 2 H2(g) + O2(g)and the relevant bond energies are H-H : 436 kJ/mol; H-O : 467 kJ/mol; O-O : 146 kJ/mol; O=O : 498 kJ/mol. 1. +249 ...

**AP Chem**

What energy change is associated with the reaction to obtain one mole of H2 from one mole of water vapor? The balanced equation is 2 H2O(g) -> 2 H2(g) + O2(g)and the relevant bond energies are H-H : 436 kJ/mol; H-O : 467 kJ/mol; O-O : 146 kJ/mol; O=O : 498 kJ/mol. 1. +249 ...

**AP Chem**

The heat of combustion of octane (C8H18) is 47.8 kJ/g and one gallon of C8H18 has a mass of 2620 g. If a car using octane is driven 10,000 miles in one year and gets 25 miles per gallon of octane, what is the total energy consumption? 1. 5.01 × 107 kJ 2. 8.45 × 102...

**Chem**

The heat of combustion of octane (C8H18) is 47.8 kJ/g and one gallon of C8H18 has a mass of 2620 g. If a car using octane is driven 10,000 miles in one year and gets 25 miles per gallon of octane, what is the total energy consumption? 1. 5.01 × 107 kJ 2. 8.45 × 102...

**Math**

State different situations that do not involve money in which a formula like the one for compound interest is used. In each case, state a related problem and write its solution.

**Math**

Amy is charged 12% annual interest compounded monthly on the unpaid balance of a $2000 loan. She did not make any payments for 2 years. Her friend said the amount she owed had more than doubled, is that true? how much does she owe?

**Chem**

What happens when a student cup between trials? What effect will the error have on the calculated value of the delta H of neutralization?