# Posts by dale

Total # Posts: 79

College Alg
The intensity I of an x-ray after it has passed through a material that is x centimeters thick is given by I = I0e^–kx, where I0 is the initial intensity of the x-ray and k is a number that depends on the material. The constant k for copper is 3.2. Find the thickness of ...

College Alg
The probability P, as a percent, that a certain computer keyboard in a public library will last more than t years can be approximated by P = 100e^?1.2t. After how many years will the probability of keyboard failure be 76%? Round to the nearest tenth.

College Alg
Suppose your salary in 2015 is \$40,000. Assuming an annual inflation rate of 8%, what salary do you need to earn in 2020 in order to have the same purchasing power? (Round your answer to two decimal places.)

College Alg
A couple plans to save for their child's college education. What principal must be deposited by the parents when their child is born in order to have \$41,000 when the child reaches the age of 18? Assume the money earns 9% interest, compounded quarterly. (Round your answer ...

INFORMATION LITERACY
What do you like and dislike about Bing(common search engine).

Information Literacy lesson 2
SORRY THE CHOICES ARE A, recognize only synonyms, B. aren't programmed to understand plain language searches, C. use only keyword searches, D. require only subject-related searches my answer will be A

Information Literacy lesson 2
think is B

Information Literacy lesson 2
Which of the following options are available under "filters" in Expanded Academic ASAP

vocab
a. Equality

Calculus
Thanks

Calculus
If f is an exponential function of the form f(x)=C times a^x with growth factor 5 and f(5)=14. What is f(6)? I know f(6) is 70 but how do you set up the equation to get 70?

Physics
A 4 kg object is suspended by a string from the ceiling of an elevator. The acceleration of gravity is 9.8 m/s2 . Determine the tension in the string if it is accelerating upward at a rate of 2.4 m/s2. Answer in units of N part 2 Determine the tension in the string if it is ...

physics
Use whatever radius of Earth that is given to you or you can find. - what do you mean by this ?

physics
Calculate the radius of a “super- Earth” with 10 times the mass of Earth, using Earth data as a starting point.

astronomy/physics
If the Solar System had formed right after the Big Bang, it would have lacked oxygen (O), and therefore water (H2O). Using the solar nebula theory, describe what would have been most different about the planet formation process and the planets formed in this alternative Solar ...

arithmetic
write 4.33 as a mixed number

Physics
A bullet is fired into a block of wood with speed 250 m/s. The block is attached to a spring that has a spring of 200 N/m. The block embedded bullet compresses the spring a distance of 30.0 cm to the right. Determine the mass of the wooden block

Phi
The social contract approach to political theory

grammar
I need to combine the following sentence pair. First, reduce the second sentence to a participial or n absolute phrase, changing the form of the verb if necessary. Then, insert the phrase into the first sentence. Be sure to place a participial phrase next to the noun or ...

Physics
how many grams of water at 20 degrees celcius are necessary to change 800.0g of water at 90.0 degrees celsius to 50.0 degrees celcius?

Algebra
tn = (-1)n(n) A. -1, -2, -3, -4 B. -1, 2, -3, 4 C. 1, ½, 2/3, ¾ D. 1, 2, 3, 4

Math
Jane needs \$30,000 to buy another new car in eight years. How much should she deposit at the end of each half year into an account that earns 4% interest compunded semianually?

world geography
just let me know what ones are wrong if any. please and thank you.

world geography
1. The natural vegetation regions of sub-Saharan Africa A. are heavily impacted by human activity. B. don't correspond closely to climatic regions. C. only correspond to climatic conditions in areas of West Africa. D. are all characteristic of equatorial latitudes. 2. ...

World Geography
1.d 2.c 3.b 4.d 5.b 6.a 7.b 8.c 9.b 10.a 11.c 12.d 13.d 14.d 15.c 16.a 17.b 18.a 19.b 20.c

World Geography
Latin America and North America 1. The _______ were responsible for the forced migration of more people from Africa than any other colonial power. A. Portuguese B. Dutch C. Spanish D. British 2. Regarding tropical rainforests, the term evapotranspiration refers to the fact ...

Physics
Aaron (mass 60 kg) catches his running cat (mass 5 kg) moving horizontally at 1.5 m/s. What is the speed of Aaron and his cat after the catch?

physics
The spring of the pressure gauge shown in the figure below has a force constant of 1,080 N/m, and the piston has a radius of 1.43 cm. As the gauge is lowered into water, what change in depth causes the piston to move in by 0.750 cm?

Chemistry/stoichiometry
If you can do just one for me I can used it as a template to do the rest. Thank you in advance For each reaction, calculate the mass (in grams) of the product formed when 10.3 of the underlined reactant completely reacts. Assume that there is more than enough of the other ...

Chemistry/stoichiometry
For the reaction shown, calculate how many moles of NO2 form when each amount of reactant completely reacts. 2N2O5g = 4NO2g+O2g I am assuming that the first question must be converted to grams and the second question must be converted to kilograms I just need to know how to ...

prealgbra
Rational

Operations Management
Can someone explain Deming's Fourteen Points?

physics
If you live in a city your stove can be powered by natural gas. This gas is mainly methane gas and has a density of about 0.72 kilograms per cubic meter. What minimum sized balloon would you have to fill in order to be able to be lifted into the air? Take your mass to be 75 ...

math
It takes Mrs. Brown exactly 3 hours and 30 minutes to drive from her home to fayetteville. Her abverage speed is 60 miles per hour. how far is Mrs. Brown's home from fayetteville?

Trig
Write the following in terms of sin(θ) and cos(θ); then simplify if possible. csc(θ) - cot(θ)cos(θ) =

Mathematics
The sum of the numerator and denominator of a fraction is 17. If 3 is added to the numerator, the value of the fraction will be 1. What is the fraction? Explain your workings.

Mathematics
The sum of the numerator and denominator of a fraction is 17. If 3 is added to the numerator, the value of the fraction will be 1. What is the fraction? Explain your workings.

math
1/(1*3) + 1/(3*5) + 1/(5*7)= 3/7 come up with a formula S(n)

Math
An airplane over the Pacific Ocean sights an atoll at an 7° angle of depression. If the plane is 850 m above the water, how many kilometers is it from a point 850 m directly above the atoll?

physics
Water flows over a section of a waterfall at the rate of 5.4 104 kg/s and falls 38 m. How much power is generated by the falling water?

us history
Identify the political, social, and economic aspects of Reconstruction?

Social STUDIES
Representative democracy

Algebra 2
(3y 2/3)-3 rewrite with positive exponents. assume that even roots are nonzero quantities and the denominator are nonzero

physics
A hockey puck of mass 0.450 kg is sliding across the ice. However, because of the frictional force between the puck and the ice, the motion of the puck is stopped in 15.8 seconds. Determine the magnitude of the frictional force.

physics
A car that weighs 15,000 N is initially moving at 60km/hr when the brakes are applied. The car is brought to a stop in 30m. Assuming the force applied by the brakes is constant, determine the magnitude of the braking force.

Math
How to solve 24x^2 - 42x + 9

chemistry
6.725x10^-28

physics
A ball (m=53g) is projected vertically with an initial speed of 9.2m/s. If the ball rises to a maximum height of 3.6m, how much kinetic energy is dissipated by the drag force of air resistance? I know it is .373J How much higher would the ball have gone in a vacuum??

American History
I need to compare Thomas Paine to a well known person today. Any suggestions?

Compare Thomas Paine to someone well known today

Math ( Surveying )
Need help with this problem! Thanks in advance. The ground clearance of an overhead electrical cable must be determined. Surveyor B is positioned directly under the cable (surveyor B can make a position check by sighting past the string of a plumb bob, held in his or her ...

social studies
the years between 500-1500 AD were called?

Algebra
A rectangular sheet of paper measures 2/3 FT by 1/5 FT. what is the area

Finance
You need to buy 20 computers for your business. You have the option of leasing the equipment for four years at \$5,000 per year or buying the equipment at \$1,000 per unit. Calculate the total cost for both options. What is the best option and why?

Chemistry
Ammonia is formed by reacting nitrogen and hydrogen gases. How many liters of ammonia gas is formed from 13.7 L of hydrogen gas at 93C and pressure of 40 kPa?

Math
Adam, Bill, Chris, and Dave each own one quarter of a company. Bill sells 2/3 of his shares to Dave. Adam sells 3/5 of his shares to Chris and the rest to Dave. How much of the company does Dave own now?

Math
I'm completely confused, please help explain how my teacher got this answer. How many board feet is the walking surface of my deck? How many boards are installed? This is the key she gives: 2” x 6” x 16’ long… 24’ / 6” = 24’ / .5’ = ...

physics
Michaela is planning a trip in Ireland from Killarney to Cork to visit Blarney Castle. She also wants to visit Fermoy which is located 86 km due east of Killarney and 27 km due north of Cork. Draw the displacement vectors for the trip when she travels from Killarney to Fermoy ...

physics
A brick is thrown vertically upward with an initial speed of 5.00 m/s from the roof of a building. If the building is 112.0 m tall, how much time passes before the brick lands on the ground?

physics
A rubber ball is attached to a paddle by a rubber band. The ball is initially moving away from the paddle with a speed of 5.5 m/s. After 0.35 s, the ball is moving toward the paddle with a speed of 5.5 m/s. What is the average acceleration of the ball during that 0.35 s? Give ...

physics
If a pronghorn antelope accelerates from rest in a straight line with a constant acceleration of 1.5 m/s2 , how long does it take for the antelope to reach a speed of 18 m/s?

trig
Here's a quick sketch I made in paint. i49 . tinypic . com/2jhy0p . jpg Remove the spaces. Also, Point E is on the origin.

trig
Two sides of triangle CDE are 9 and 4, as shown. Write an equation in standard form for the line CD. Leave values as radicals. There is a picture of a triangle that passes through point (4,0) The answer is 65^1/2x + 4y = 4(65^1/2) But, I don't understand how to do this ...

math
find x in: 2x - 3 = x-1

Computation of Present Value) Using the appropriate interest table, compute the present values of the following periodic amounts due at the end of the designated periods. \$30,000 payable at the end of the seventh, eighth, ninth, and tenth periods at 12%.

Criminal Justice
What impact does terrorism and cyber crimes have on interpreting the fourth amendment?

Calculus I
Hi, I'm trying to figure this out, but the answer I keep coming up with is incorrect. Can anyone help me out? Thanks. Problem: y=2(6-x^2)^5 I know I'm supposed to use the chain rule, but I'm getting confused.

Math
Need to know the formula for find the perimeter. Need to solve this problem. A square metal box has a perimeter of 8.32". If the sides are .04" thick what is the perimeter of the inside?

world history
I never saw Shindler's List in the movie house because I was afraid to. So I saw it on my TV several times. My question is, what was the relationship between Amon and Helen Hirsch? Lovers? Hard to believe. What happened to her after leaving Poland? Is she still alive and ...

math
(2+r)15

college psychology
functional fixedness

Biology - Heart Rate/Blood Pressure
why do we mesure our blood pressure in Hg

math riddle ALGEBRA WITH PIZZAZZ
when do sky divers use decimals

math
Yes "U" stand for union "n" stand for intersection. The A1 is supposed to A'.

math
Given that u = {1,2,3,4,5,6,7,8,9}, A ={2,3,4,5} and B= {4,5,7,8}, list the following sets: i) Au (A1nB) ii) Bu (A1n B) iii) Au (AnB1) iv) B1u (AnB1) v) A u(A1nB1)

college Algebra
Given that u = {1,2,3,4,5,6,7,8,9}, A ={2,3,4,5} and B= {4,5,7,8}, list the following sets: i) Au (A1nB) ii) Bu (A1n B) iii) Au (AnB1) iv) B1u (AnB1) v) A u(A1nB1)

Anthropology
Describe an incident you participated in or observed that involved cross-cultural miscommunication. What was the outcome? You can use an incident involving miscommunication between people of different genders. This sounds like a fun assignment. You missed the word YOU. Think ...

Math
I have 37 different dollar amounts. I also have an additional 2 dollar amounts. If I total the 2 dollar amounts I get the same number as if I total all 37 amounts. Is there a way to use this information to break up the 37 numbers into 2 sets so that each set will total each ...

Neon
Neons normal phase is gas, and a slogan i found was "it wouldn't be vegas without neon"

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