# Posts by joel

Total # Posts: 310

Statistics
Of 100 people who were given a vaccine,80 developed immunity to a disease.the 98% interval on the proportion of people developing immunity is?need help

Chemistry
What is a photon? Several selections may be correct. Has an energy of equal to hν. Is a unit of electromagnetic radiation. Is a part of the electromagnetic spectrum. Is usually called visible light. None of these.

Chemistry
a 23ml H2SO4 solution is titrated by 50 ml 0.10 M NaOH solution, what is the molarity of H2SO4 solution? (Note that H2SO4 is a diprotic acid)

Algebra
292

Maths literacy
Write 78/115 as a decimal fraction

algebra
Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this. -7x – 5y = 1.5 -5x – 4y = 4.5

algebra
Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this. -x – 8y = 43 4x + 32y = 172

algebra
A dehydrated patient needs a 3.82% saline IV. Unfortunately, the hospital only has bags of 4% and 3% saline solutions. How many liters of each of these solutions should be mixed together to yield 5 liters of the desired concentration?

algebra
To buy both a new car and a new house, Tina sought two loans totalling \$319,531. The simple interest rate on the first loan was 2.7%, while the simple interest rate on the second loan was 2.6%. At the end of the first year, Tina paid a combined interest payment of \$8334.15. ...

algebra
Select the set of equations that represents the following situation: Mary invested one amount at 7% simple interest, and a second amount at 5% interest, earning \$29.80 in one year. If she had switched the amounts, she would have earned \$35.00. What were the two amounts? (...

algebra
Select the set of equations that represents the following situation: Mary invested one amount at 7% simple interest, and a second amount at 5% interest, earning \$29.80 in one year. If she had switched the amounts, she would have earned \$35.00. What were the two amounts? (...

algebra
Select the set of equations that represents the following situation: The cost of eleven CDs and twelve DVDs is \$150.62; and the cost of one DVDs and twelve CDs is \$116.07. How much do a CD and a DVD cost? (Points : 3) 11x + 12y = 150.62; 12x + 1y = 116.07 11x • 12y = 150....

algebra
Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this. -3x + 4y = -19.5 -3x + y = -10.5

algebra
Solve using the substitution method. Show your work. If the system has no solution or an infinite number of solutions, state this. x + 10y = 41 x + 9y = 37

algebra
Select the set of equations that represents the following situation: Mary invested one amount at 7% simple interest, and a second amount at 5% interest, earning \$29.80 in one year. If she had switched the amounts, she would have earned \$35.00. What were the two amounts?

Algebra
Cody’s motorboat took 3 hr to make a trip downstream with a 6-mph current. The return trip against the same current took 5 hr. Find the speed of the boat in still water

intermediate algebra
Select the set of equations that represents the following situation: Mike invested \$706 for one year. He invested part of it at 5% and the rest at 3%. At the end of the year he earned \$28.00 in interest. How much did Mike invest at each rate of interest?

Physics
A Force,F=10N,applied at an angle of 37 degree above the horizontal,moves a crate a distance of 5m along a rough horizontal surface.A frictional force of 5N opposes the motion.what is the change in kinetic energy?

statistics
the correlation between two random variables X and Y is p=-0.75.it is given that X=1,2or3 with equal probability of 1/3 and Y=-1,-2or-3 with equal probability of 1/3.the covariance is equal to?i need help.i have been struggling to get the answer>

Physics
A 3kg mass moving initially to the right along the x axis with a speed of 8m/s makes a perfectly inelastic collision with a 5kg mass initially at rest at the origin.what fraction of the initial kinetic energy of the system is lost in the collision.what formula must i use.

Physics
A 3kg mass moving initially to the right along the x axis with a speed of 8m/s makes a perfectly inelastic collision with a 5kg mass initially at rest at the origin.what fraction of the initial kinetic energy of the system is lost in the collision.what formula must i use.

Pre-Algebra
Thank you, Ms. Sue!

Pre-Algebra
If 4 liters of motor oil cost \$3.88, what is the price for 1 liter? I'm supposed yo set up proportions. This is how I set it up: \$3.88/4 liters • 1 liter/p p= the price for 1 liter Please tell me if I set it up right and how to solve.

physical science
gravity

Maths
is 10*10exponent -3 a scientific notation?

Physics
Two points charges of 2uC and -6uC are located at the position(0.0)m and (0.3)m.Calculate the total electrical potential at the point (4.0)m due these two charges.

Physics
hi Esskay,can u help me with the answer

Physics
A proton is released from rest in a uniform electric field which is directed along the x axis and of magnitude E=2*10exponent5 V/m.The proton undergoes a displacement from point A at the origin to point B at x=0.2m.What is the change in the potential energy of the proton ...

Physics
if a ball is thrown straight upward and is caught 5s after being thrown,how fast must it have been going when it left the person s hand?help

physics
if a ball is thrown vertically upward and is caught 5 seconds,how fast must have been going when it left the person s hand?help

math
Write a missing addend addition sentence to help solve 78-49.explain how you would use it.

PHYSICS
They both experience the same impact force however the fly will experience a greater acceleration

Phys
V = (f)* (wavelength) 200m/s = 100hz * Wavelength solve for wavelength then multiply by 3 dont forget to use the units for each variable like he gave us in class i.e. frequency = vibration/time wavelength = distance/vibration velocity = distance/time

Physics
I know for sure that the answer is not B or C since the volume increases and the temperature increases, however i am having a hard time understanding the definition of an adiabatic process and how to determine if there is any heat lost to the atmosphere. I am pretty sure the ...

Physics
A gas is taken though a single process in which its volume decreases by .25 m^3 as the temp of the gas rises 2deg C. Which of the following people are more likely to have reached the correct conclusion? a. Bob Identifies this process as adiabatic b. Jill identifies this ...

History
A more unified African American culture began to emerge in the early decades of the nineteenth century because? the Gullah dialect spread to the new slave territories in the Old Southwest. the rapid transfer of slaves from other regions into the Lower Mississippi Valley ...

English
1) lessons, is better 2) is good 3) 2 lessons/2 more hours of lesson 4) good 5) i go to the bathroom where i wash and dress myself (not dressed myself) 6)i get ready for school 7) good 8) good 9) computer lab and fine

algebra
Select the set of equations that represents the following situation: The cost of eleven CDs and twelve DVDs is \$150.62; and the cost of one DVDs and twelve CDs is \$116.07. How much do a CD and a DVD cost? (Points : 3) 11x + 12y = 150.62; 12x + 1y = 116.07 11x • 12y = 150....

physics
If there are three forces acting on an object, one straight up, one up at an angle to the left (angle unknown) and one up at an angle to the right what direction is the combined force? Is it possible for the combined force of those three forces to be down?

Math
Two sides of a triangle have the same length. The third side measures 4 meters less than twice the common length . The perimeter of the triangle is 16 meters. What are the lengths of the three sides?

Business Calculus
An ice cube that is 3 cm on each side is melting at a rate of 2 cm cubed per minute. how fast is the length of the side decreasing?

Science
that doesnt help me though. i need to know what Describe the role of gravity as the force that governs the movement of the solar system and the universe means.

Science
"Describe the role of gravity as the force that governs the movement of the solar system and the universe." I don't get it.

math
Tyrell says \$750 is about \$800.Sara says \$750 is about \$700.who is correct?explain.

math
in which number does 4 have the greatest value 9499 4391 2240 1944

Physics
This should say Physics-Typo error

Ohysics
An airplane flying at 120km/h due west moves into a region where the wind is blowing at 40km/h due east. If the plane's original vecotr velocity is Vplane, what is the expression for the plane's resulting velocity in terms of Vplane. a. 1/3 >Vplane b. 2/3>Vplane ...

Physics
A lightning bug flies at a velocity of 0.25m/s due east toward another lightning bug seen off in the distance. A light breeze blows from the east on the bug at a velocity of 0.25m/s. What is the resultant velocity of the lightning bug? Please direct me to even start-I'm ...

Math
Help! Toshiro Hashimoto invested some money at 4.5% simple interest and \$1000 more than four times the amount at 6%. His total annual income for one year from interest on the two investments was \$801. How much did he invest at each rate?

Language Arts
I need the complete predicate in this sentence? Ida B. Wells was born into slavery in 1862 in Holly Springs, Mississippi.

English
Could someone help with the main idea of this paragraph? Please and thank you Old Man Warner snorted. 'Pack of crazy fools," he said. "Listening to the young folks, nothing's good enough for them. Next thing you know, they'll be wanting to go back to ...

Math
Thank you so much

Math
Help-I just started Algebra II and I'm lost. What is the solution of 10 = absolute value of 7-3x. Please show steps so I can understand

Physics
I just need to clarify something in my mind- I look at a graph and the position changes from 3 to 8 over a ten second interval, to find total displacement, I just take 8-3 would equal 5 for total displacement, correct? I don't need to bother with the time interval, correct...

Chemistry
What is the pH of a 1.0E-8 M solution of HCl? Please note that you cannot simply add the contribution of H+ ions from the autoproteolysis of water and the contribution from the dissociation of HCl. You will need to use the quadratic equation to solve this problem and report ...

Chemistry
What is the pH (to three figures) of a 0.1 M solution of sodium acetate given that the acid dissociation constant (Ka) of acetic acid is 1.8E-5? Hint: I keep getting 2.87 but its wrong.

Math
y=3x-3.5

Global History
ok thanks jimmy and Ms.Sue

trig
what is the tan of 25 degrees and 01 minute

English
In many works of literature, an individual's encounter with death or destruction ultimately leads to the individual's affirmation of the dignity and worth of human life. What does this quote means and how does this quote relates to Hamlet by William Shakespeare. I have...

s.s.
it says they slowly decliened

s.s.
history idk

s.s.
Axum's conversion to Christianity a. beneficial b. a drawback c. first a drawback then beneficial d. first beneficial then a drawback

algebra
for x-y=3 add y to both sides then subtract three from both sides. For x+4y=9 subtract x from both sides then divide everything by 4.

Can't understand trig problem
An airplane left an airport and flew east 174 miles. Then it turned northward flying along a bearing of N22E. When it was 254 miles from the airport, there was an engine problem and it turned back to take the shortest route possible back to the airport. Find theta, the angle ...

Geography
What climate does the United States not have?

physics
There's a magic ring in a sealed paint can at the bottom of a frozen pond in the middle of a bog. YOu must get the ring via a plan which: gets you and equipment you need across without sinking, cross the frozen pond without breaking through the ice, lift the paint can out ...

algebra 2
X + 2 = - 2

algebra 2
X+2 = 3 - 5

Precalculus
If sinu = -5/7 and pie<u<3pie/2 find 2u Does anyone know the answer to this (not the steps for solving I know that my answer just keeps coming out funny)

Precalculus
what are the zeroes of the graph 2sin(squared)x + cosx-3 = 0

american government
What are the differences and similarities between baltimore country council and the Maryland general assembly

precal desperate
Given sina= 3/4 and cosB = (-5)/13 and this is Quad II find cos(a+B)

precalculus
Given sina= 3/4 and cosB = (-5)/13 and this is Quad II find cos(a+B)

algebra
Which is greater? 7 3/4 or 7 2/3

math
You got the answer pretty much right but a more exact answer would be 8/3 or 2 2/3. Because in decimal form it is actually 2.66666667

Calculus - Related Rates
12mm^2/hr = r2PI dr/dt So 12/2PIr mm^2/hr = dr/dt which is the same as dr/dt = 6/PIr mm^2/hr Why'd you originally say dr/dt= 12/(2r) mm/hr

Calculus - Related Rates
I'm sorry, I'm not following what you did. I get that we know dx/dt = 12mm^2/hr and we want to find dr/dt but I don't know how you linked them together as a function of r. Maybe show me more steps and how you got the derivative dr/dt. Thanks

Calculus - Related Rates
Bacteria are growing in a circular colony one bacterium thick. The bacteria are growing at a constant rate, thus making the area of the colony increase at a constant rate of 12 mm sq. per hour. Find an equation expressing the rate of change of the radius as a function of the ...

science
how do geologists determine the texture of a rock

8th grade
what is gnama artea it means Kings must follow laws too.

com130
. In what situations might an individual writing process be preferable?

calculus
find the integral of square root of 1+x^3 dx or sqrt(1+ x^3)dx

calculus help
find the integral of square root of 1+x^3 dx or sqrt(1+ x^3)dx

calculus i need help please
evaluate: integration of x^2 (square root of (1-2x^3))dx

calculus
thanks

calculus
evaluate: integration of x^2 (square root of (1-2x^3))dx

Government
How has the clean air act increased the power of the federal government relative to the power of the state governments?

Macro Economics
Can it be considered acceptable to policy makers to have about 7 million people classified as unemployed in the U.S.? Explain.

Macro Economics
I meant frictional unemployment rate

Macro Economics
Does anyone know how to calculate the frictional rate of employment...given the following information... The structural unemployment rate of 2.8%, actual unemployment rate of 7% and cyclical unemployment is 2.0% I just need to know the formula to use??

beginning chemistry
calculate the volume of 750.0g of gold.

math grade 3
need to draw data sets to find the mean. I know how to use this putting the numbers in order from least to greatest, but how do I draw this?

Algebra
Thank you so much! :)

Algebra
I still don't get it! My brain is burnt right now.

Algebra
Gabe lives fifteen miles from school and the bus stops seven times at three minutes each between his house and school. The bus arrives at his house at 7:30. Gabe's friend Aaron lives 8 miles from school and the bus stops four times at 2 minutes each between his house and ...

Algebra
Ann sells apples and Beth sells oranges. Today, half the number of apples than Ann sold was fifteen less than thrice as much the number of oranges that Beth sold. I just want it to know; how do I convert it into an algebraic expression or equation? Is confusing and I don't...

Algebra
so it will be like this? 1/2 A= 3B - 15

Algebra
Thank you. I can work on it now. :)

Algebra
Ann sells apples and Beth sells oranges. Today, half the number of apples than Ann sold was fifteen less than thrice as much the number of oranges that Beth sold. Can someone explain to me what this means and how to do it pretty please? I really need help on this one. Can ...

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