# Posts by Samantha

Total # Posts: 1,702

Chemistry
The temperature of an object increases by 44.9 °C when it absorbs 3871 J of heat. Calculate the heat capacity of the object.

Chemistry
Your computer monitor has a width of 14.56 inches and a height of 10.92 inches. What is the area of the monitor display in square meters?

Chemistry
What is the mass, in grams, of a pure iron cube that has a volume of 4.30 cm3?

math
plese help

math
Every night when Samantha came home from work she put any change she had in her pockets into a jar. One day she wanted to know how much change she had in her jar. She noticed that she had two more nickels than twice the number of dimes, and eight fewer quarters than twice the ...

Health
help help

Algebra2
When using the Vertical motion model, where does the leading coefficient -16 come from? When will it not be -16 and how will you know? I'm just trying to understand the Model.

what happens to the value expression 20 + a as a increases

calculous (Series)
-2.02 - 2.11 - 2.2 - ... -4 Find the sum of the series

Physics
A ladder of mass M and length 6 m rests against a frictionless wall at an angle of 50 degrees to the horizontal. The coefficient of static friction between the ladder and the floor is 0.5. What is the maximum distance along the ladder a person of mass 11M can climb before the ...

Math
Find the critical points and the interval on which the given function is increasing or decreasing, and apply the First Derivative Test to each critical point f(x)= (7/4)x^4+(28/3)x^3+(-63/2)x^2-252x critical points in increasing order: c1=? min or max? c2=? min or max? c3=? ...

Math (Word Problem into formula)
A chemist is studying the properties of a bronze alloy (mixture) of copper and tin. She begins with 6 kg of an alloy that is one sixth tin. Keeping the amount of copper constant, she adds small amounts of tin to the alloy. Letting x be the total amount of tin added, define c(x...

Chemistry
To 1.0 ml of 1.5%NaCl, water is added to a final volume of 100ml. What is the molarity NaCl of this final solution? 1.5g/100ml I do not know where to go from here?

math
On May 22, 1960, a powerful earthquake took place in Chile. It had a magnitude of 9.5. How much energy did this earthquake release?

Math
If a hen lays 225 days a year, how many eggs can you eat in a day?

Math Help!
k=70

chemistry
10.0 mL of a Cu2+ solution of unknown concentration was placed in a 250 mL Erlenmeyer flask. An excess of KI solution was added. Indicator was added and the solution was diluted with H2O to a total volume of 75 mL. The solution was titrated with 0.20 M Na2S2O3. The equivalence...

Or
or would it be 9(sin theta - 5/9) i believe i did the work wrong

Follow up work.. I am unsure if it is the right
I know i would bring the 5 over to the other side so it would look like x = 9sin theta - 5 would I distribute the 9 to the sin and the -5? So x = 9(sin theta - 45) just confused on how to get to cos 2 theta

Math
A bag contains 6 red balls, 5 green balls and 4 yellow balls. How many balls must you take out to be sure that you have at least 3 balls of each color? I literally have no idea for this question. Should I just put 15(take all of them out to be sure?) or is there some kind on ...

UNION UNIVERSITY
Find the Z score for the weights of Middle school boys which are approximately Normal, mean = 130 lbs, Standard Deviation = 7, if Johnny weighs 148 lbs, What's his Z score?

Physics
NASA, when it sends probes to other planets, uses what is known as a gravitational slingshot. This is when a probe uses the gravitational potential energy a planet to gain kinetic energy. Even though the probe and the planet are not physically colliding, one can treat this ...

Physics
A block of mass 0.45 kg can slide over a frictionless horizontal surface. It is attached to a spring whose stiffness constant is k = 18 N/m. The block is pulled 38 cm and let go. a)What is its maximum speed? b)What is its speed when the extension is 30 cm? c)At what position ...

Hffuh

grammar
them

global studies
Like many absolute monarchs before him, Peter the Great strengthened his own power by limiting the power of Russian

Chemistry 104
A student has 10.0mL of phosphate solution that contains 1.0M PO4{3-}.The Student reacts this with excess ammonium & magnesium under basic conditions to produce 2.2034g of struvite. Calculate the % yield.

Math
Each letter in this addition problem stands for a different digit, but every letter stands for the same digit everywhere it appears. For example, all of the C's stand for the same digit. Reconstruct the problem to find the value of SCENE. CUTS +CUTS ------ SCENE

You are correct 10

Math
Logan saves \$5.50 in dimes and quarters over a week. He has 20 more dimes than quarters. Find the number of dimes and quarters he saves. How do I solve the problem algebraically?

chemistry
Can someone please explain to me how to find the energy released? Given the overall reaction that takes place when hydrogen is burned in a young star, how much energy in MeV is released per He nucleus formed? masses: 1-H atom= 1.007amu 4-He atom= 4.002 amu positron = 5.485e-4 ...

Pre-Calculus

Chemistry
244pm

Algebra 3-4
The first stage of a rocket burns 28 s longer than the second stage. If the total burn time for both stages is 152 s, how long does each stage burn? Describe how you found your answer. I was originally thinking to divide 152 by 2 then add 28, but I realized that wouldn't ...

Physics
An object has a initial velocity of 10 m/s in the positive x direction. Under a constant acceleration it stops after undergoing a displacement of 148.3 m in the positive x direction. Because it is still under the same acceleration it then travels back in the negative in the x ...

Math, Calculus
0.00695

Math
Why does Zara have a good driving record?

math
Yooyoullylyl

algebra
is 3.27 a rational or irrational number

college statistics
The CEO of ABC manufacturing commissioned a study to look at the differences between the current salaries of her employees (n = 474) and their starting salaries. The study collected current and beginning salary data for each of the 474 employees and the researcher conducted a ...

science
A runner whose mass is 49 kg accelerates from a stop to a speed of 6 m/s in 3 seconds. (A good sprinter can run 100 meters in about 10 seconds, with an average speed of 10 m/s.) (a) What is the average horizontal component of the force that the ground exerts on the runner'...

physics
An object with mass 110 kg moved in outer space. When it was at location < 11, -35, -7 > its speed was 17.5 m/s. A single constant force < 230, 420, -230 > N acted on the object while the object moved to location < 16, -41, -13 > m. What is the speed of the ...

math
Mike's number is 2000 more than Jerry's which is 400 less than Barry's. Larry's number is 1500 more than Sam's, which is 443. Sam's number is 60 less than Barry's. WHat is each boy's number?

math
Mike's number is 2000 more than Jerry's which is 400 less than Barry's. Larry's number is 1500 more than Sam's, which is 443. Sam's number is 60 less than Barry's.

algebra
A pet boarding facility wants to build two adjacent pens of equal size. They are using the length of the dog kennel as one side of the two pens. They have 324 feet of fencing to build the pens. What width should he make the pens to maximize the total area of the pens?

Math
When rolling a standard number cube twice, what is the probability of rolling two even numbers? I'm pretty sure the answer is 1/4, but the solutions says that this is wrong.

statistics
A pop-music record firm wants the distribution of lengths of cuts on its record to have an average of 129 seconds and a standard deviation of 10 seconds so that disc jockeys will have plenty of time for commercials within each 5-minute period. The population times for cuts is ...

Statistics
A brewery's filling machine is adjusted to fill bottles with a mean of 33.8 oz. of ale and a variance of 0.005. Periodically, a bottle is checked and the amount of ale noted. (b) Let's say you buy 93 bottles of this ale for a party. How many bottles would you expect to...

Calculus
1. If y′= x(1+ y) and y > -1 , then y= A) y=sinx B) y=3x^2+C << C) y=Ce^1/2x^2-1 D) y=1/2e^x^2+C E) y=Csq(x+3) 2. If dy/dx = x cos x^2 and y = −3 when x = 0, when x = π, y = ___. A) -3.215 B) √2 << C) 1.647 D) 6 E) 3π 3. Suppose an ...

Calculus
1) yy'-e^x= 0, and y=4 when x=0 means that: A)y=x-lnx^2+4 B)y^2=4x^2+3 C)y=-2x+1/2x^3 D)y^2=2e^x+14 E)1/2ln|x^2+4|+6 2) The rate of change of P with respect to t is directly proportional to (10-t) and inversely proportional to the cube root of P. The differential equation ...

Calculus
Which of the following is a separable, first-order differential equation? A) dy/dx= x+y/2x B) dy/dx=x+y/x-y C) dy/dx=sinx << D) dy/dx=xy/x+y E) dy/dx= 2lnxy 2) The differential equation dy/dx=y/x^2 has a solution given by: A) y=C sqrt(x^2+4) B)y=C e^-1/x C)-1/2ex^2+C D) ...

Calculus
Thank you!!

Calculus
The region R is bounded by the x-axis, x = 1, x = 3, and y = 1/x^3 A) Find the area of R B) B. Find the value of h, such that the vertical line x = h divides the region R into two Regions of equal area.

Calculus
Can someone check my answer? The change in the momentum of an object (Δ p) is given by the force, F, acting on the object multiplied by the time interval that the force was acting: Δ p = F Δt . If the force (in newtons) acting on a particular object is given by ...

math

Chemistry
Long question but its my last one for homework and im stuck on this word problem. Biomass is represented by the empirical formula C60H87O23N12P. Write a balance equation for the oxidation of C60H87O23N12P with O2 to form CO2, H2O, HNO3, and H3PO4 beginning with 1000g of ...

Math
22,000/400=55

English
He is not only a great baseball player ,but also a fine pianist. Which is correct (a) preposition ( b) adjective (c) correlative (d) adverb

statistics
The state bridge design engineer has devised a plan to repair North Carolina's 4420 bridges that are currently listed as being in either poor or fair condition. The state has a total of 13,168 bridges. Before the governor will include the cost of this plan in his budget, ...

Math 10
Hello, I did this question for homework, but my teacher said it was wrong and she didn't explain how it was supposed to be done. So could you please tell me how I am supposed to do this step by step? "A baseball is thrown from the top of a building and falls to the ...

CALCULUS problem
There are four parts to this one question, and would really appreciate if you could show and explain how you get to the answer, because I tried looking up how to find the answer myself, but nothing made sense. Thank you! 11. The region R is bounded by the x-axis, x = 1, x = 3...

Math
Jack bought a sweater at the sale price of \$25. The original cost of the sweater was \$40. What percent represents the discount that he received when buying the sweater?

Math 2
15

physics
A soccer player kicks a ball straight up into the air at 6m.s per second.Ignore air friction. 1.What is the height of the ball at its highest point 2.What is the ball's acceleration at its highest point 3.Calculate the maximum height reached by the ball

physics
A soccer player kicks a ball straight up into the air at 6m.s per second.Ignore air friction. 1.What is the height of the ball at its highest point 2.What ie the ball's acceleration at its highest point 3.Calculate the maximum height reached by the ball

Chemistry
It says 8. In a similar experiment Mary Moreorlesss was to determine the loss of weight when a crucible of potassium chlorate was heated to drive off the oxygen. After finishing the experiment she concluded the potassium chlorate contained 24.0% oxygen. Why did miraculous(...

I took this quiz and the answer is B

Social studies
No I don't understand...

Social studies
Imperialism is to take over

Social studies
How is imperialism and the Spanish America war related?

math
What does "give a brief explanation as to what kind of solution(s) you expect the linear equation to have: 18x+1/2=6 (3x+25). Transform the equation into a simpler form if necessary" mean?

math
What does "give a brief explanation as to what kind of solution(s) you expect the linear equation to have: 18x+1/2=6 (3x+25). Transform the equation into a simpler form if necessary" mean?

Could that really be an experiment?

history
What are 2 reasons why people moved to the west?

math
A triangle has angles described as followed: the first angle is four more than seven times a number, another angle is four less than the first and the third angle is twice as large as the first. What are the sizes of each angle. I got the first angle of the triangle but I am ...

math
I do not understand...

math
What does "its supplement is twice as large" mean?

The measure of one angle is described as twelve more than four times a number. Its supplement is as twice as large. Find the measure of each angle using an equation.

math
Solve the linear equation: x+x+2+x+4+x+6=-28. State the property that justifies your first step and why you chose it. When I solved the equation I got the answer of ×=-10. However, I do not know what the property I need to state for my first step. Isn't it ...

What are 5 examples of oganisms that are in the Prostista Kingdom?

science
That's the question, it doesn't give any more info. Here is the info: Density of water is 1.o g/cm3 Mass of a penny is 2.5 grams

science
Mercury, a metal that is liquid at room temperature, has a density 13.5 times the density of water. How many pennies could your boat hold if we were floating it in mercury instead of water?

math
When the problem says "Angel transformed the following equation from 6x+4-×=2 (×+1) to 10=2 (×+1). He then stated that the solution to the equation is ×=4. Is he correct? Explain" when I solved the equation I got 24=10 and 10=10. However, im ...

math
When the problem says "Angel transformed the following equation from 6x+4-×=2 (×+1) to 10=2 (×+1). He then stated that the solution to the equation is ×=4. Is he correct? Explain" when I solved the equation I got 24=10 and 10=10. However, im ...

math
If the problem says "the sum that shows how many pages Maria read if she read 45 pages of a book yesterday and 2/3 of the remaining pages today." Would the expression/equation be 45 + (2/3)n ?

math
Okay, but I have one question. When it says twice the sum how does that look like? Wouldn't it be ____ + ____^2 ?

math
What would the expression be if the problem was "the sum of four consecutive numbers." ?

math
Correction: what would be the equation if the problem was "The cube of a positive number divided by the square of the same positive number." ?

math
What wouldnthenequation benif thenproblem was "The cube of positive number divided by the square of the same positive number." ?

biology
Can someone help? I don't understand gene regulation. The regulation of protein synthesis in cells involves the coordination of several different mechanisms. Discuss TWO of the specific mechanisms of gene regulation in eukaryotic cells from the list below and describe how ...

Math
Which equation represents the sentence ‘‘d is 17 less than the quotient of n and 4”?

Math
Which function rule can be used to represent the area of a triangle with a base b 8 in. longer than twice the height h in terms of the height?

AP U.S History
Explain why Britian finally decided against on behalf of the Confeder.

4 CALCULUS study problem
Never mind! I solved them all and got them right. :)

4 CALCULUS study problem
1. How fast does the radius of a spherical soap bubble change when you blow air into it at the rate of 15 cubic centimeters per second? Our known rate is dV/dt, the change in volume with respect to time, which is 15 cubic centimeters per second. The rate we want to find is dr/...

LAW
I would say 2 is A. I am checking on number 1.