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Posts by john

Total # Posts: 8,374

Calculus
a projectile is fired vertically upward from ground level with a velocity of 1600 ft/sec. If air resistance is neglected, find its distance s(t) above ground at time t. What is its maximum height?

Finite
Kane Manufacturing has a division that produces two models of hibachis, model A and model B. To produce each model-A hibachi requires 3 lb of cast iron and 6 min of labor. To produce each model-B hibachi requires 4 lb of cast iron and 3 min of labor. The profit for each model-...

maths
A committee of 4people is to be chosen from 5 married couples. Find in how many ways the committee can be chosen if; 1) everyone is equally eligible. 2) the committee should include at least one woman

Physics
a great of effort, time, and money has been spent in the quest for the so-called perpetual-motion machine, which is defined as a hypothetical machine that operates or produces useful work indefinitely and/ or a machine that produces more work or energy than it consumes. ...

Physics
the human body is only about 25 % efficient at converting input chemical energy to useful work. where does the rest of the input chemical energy go?

Chemistry
There was two slides over this, but they both involved one element.

Chemistry
Calcium Fluoride, CaF2, adopts the fluorite lattice, which is described as a face-centered cubic array of Ca2+ ions with F-1 ions with Ca2+ ions in half of the cubic holes. The Radii of Ca2+ and F-1 are 126 and 117 pm, respectively. Calculate the density of CaF2 from these ...

Chemistry
Calcium Fluoride, CaF2, adopts the fluorite lattice, which is described as a face-centered cubic array of Ca2+ ions with F-1 ions with Ca2+ ions in half of the cubic holes. The Radii of Ca2+ and F-1 are 126 and 117 pm, respectively. Calculate the density of CaF2 from these ...

Math !!!
(9/10)*60=a a*(2/3)=b a-b= how much time is left

Math
sqrt(3) * sqrt(2x+3)=sqrt(5x-6) square roots are to the 1/2 power so what you can do is square both sides 2*(1/2)= 1 so the square roots cancel. It will look like this (sqrt(3)*sqrt(2x+3))^2=(sqrt(5x-6))^2 which will cancel out all the square roots. It will end up as 3*(2x+3)=...

Math
Is this (2x-7x-6)/4.7 or (2x-7)/4.7 *(x-6)?

thomas middle such
Hundreds digit is between 1-3. Tens digits are between 6-8. The ones digit is 4-6. The total amount of digits is 11. For example, it's not 386 because the total amount is 17 (3+8+6).

Chemistry
Calcium Fluoride, CaF2, adopts the fluorite lattice, which is described as a face-centered cubic array of Ca2+ ions with F-1 ions with Ca2+ ions in half of the cubic holes. The Radii of Ca2+ and F-1 are 126 and 117 pm, respectively. Calculate the density of CaF2 from these ...

chemistry
The average molar mass of a natural gas is 17.4g/mol consisting of CH4 and C2H6,what is the molar fraction of each gas?

Check spanish answers
yo anonomys i also go to connections maybe we could help each other have an email i can text to contact you?

Chemistry
Oops, the hydrate is Copper Sulfate Pentahydrate

Chemistry
A chemist takes a 647 gram sample of this hydrate. She removes all the water possible from the sample and collects it. To this water, she adds 7.6 grams of lead(II) nitrate. Afterwards she wants to precipitate all the lead. She wants to use a solution of aluminum sulfate to ...

Chemistry
CH4 + 2O2 --> CO2 + 2H2O a. How many grams of methane are needed to produce 1.5 X 10^-2 grams of carbon dioxide? b. How many grams of oxygen are needed to react to form the 1.5 X 10^-2 grams moles of carbon dioxide?

Chemistry
CH4 + 2O2 --> CO2 + 2H2O a. How many grams of methane are needed to produce 1.5 X 10^-2 grams of carbon dioxide? b. How many grams of oxygen are needed to react to form the 1.5 X 10^-2 grams moles of carbon dioxide?

Chemistry
CH4 + 2O2 --> CO2 + 2H2O a. How many grams of methane are needed to produce 1.5 X 10^-2 grams of carbon dioxide? b. How many grams of oxygen are needed to react to form the 1.5 X 10^-2 grams moles of carbon dioxide?

Chemistry
Given 1 cc of Zinc and 1 cc of Cr What is the mass difference?

Maths
An athlete takes 2 minutes and 15 seconds to jog around a 400m running track. At this speed, how long will it take them to run 12km

Physics
A 45kg skier is sliding down a 37 degree ski slope starting from rest. She crossed the 25m in 5.0s. Ignoring air resistance, Find all the forces on the skier.

Philosophy
Each of the underlined premises can be taken as an unacceptable premise in an argument. In each case, identify the condition of premise unacceptability Premise: Most people dislike quitters Conclusion: Therefore, I shouldn’t quit smoking I`m having trouble with this ...

maths
x+y+z = 180 y = 2x z =3x 6x=180 x = 30 y=60 z=90

Math
daniel = 3 + sam sam/daniel =4/5 sam/(sam + 3) = 4/5 5s = 4s + 12 s = 12

Math HELP!!
correct

Statistics
you roll two fair dice, a green one and a red one? (a) are the outcomes on the dice independent? (b)Find P(1 on green die and 2 on red die) (c)Find P(2 on green die and 1 on red die) (d)Find P(1 on green die and 2 on red die) or (2 on green die and 1 on red die) a)yes b)p(1)*(...

Math
(38.5)x>or = 4000

math
.25 x .25 x .25

Algebra
x +10 = -10 x = -20

chem
how many atoms are there in 0.0300 mole of methane molecules?

(Math) PLZ CHECK ANSWERS
1 correct 2 C 4 C 3 is there a typo?

Statisics
Ho: p = .24 Ha: p>.24

english
In which sentence is the NONESSENTIAL CLAUSE underlined? (1 point)The man leaning against the wall is from the zoo. The snake that he is holding is not poisonous. Its coloring, which is brown and green, allows it to hide in marshy areas.** That snake slithering behind the rock...

english
26. Which sentence correctly uses punctuation with dialogue? a. " Please be seated", my teacher said.** b. " Please be seated," my teacher said c. " Please be seated my teacher said." d. " Please be seated my teacher said". 28. Which of ...

english
25. which sentence is punctuated correctly? a. "Are you finished yet, Miriam asked?" b. Are you finished yet, " Miriam asked?" c. "Are you finished yet"?Miriam asked. d. "Are you finished yet?" Miriam asked.*** 26. Which sentence ...

Math
a parking lot has 66 parking spaces. If there are 16 more compact spaces than regular spaces. How many spaces are there for compact cars?

Physics
A bullet is fired with an initial speed of 200 m/s. If a target is 500ft away, at what angle should the rifle be raised in order to hit the target?

Physical Science
A bullet is fired with an initial speed of 200 m/s. If a target is 500ft away, at what angle should the rifle be raised in order to hit the target?

Math
What is the 23rd term of the sequence 2,4,6,8,

Statistics
(56-66)/6 = -10/6 = -1.67 95% of them so multiply .95 times 1900

Chemistry
I used the ideal gas law, and I got .980456 moles. then I used the equation to substitute Helium=10.0g -Krypton in the equation (x/4)+(y/83.8)=. 980456 mols for X. With a little bit of algebra, I got 6.38079g of Krypton and 3.61921g of Helium. Thanks you for the help. I wuld ...

Chemistry
A certain mixture of helium, He, and krypton, Kr, has a mass of 10.0 g and occupies a volume of 20.0 L at 25.0EC and 1.20 atm. What is the mass of He in the mixture?

Science
An automobile accelerates 1.24 m/s^2 over 6.00 s to reach freeway speed at the end of an entrance ramp. If the cars final speed is 86.0 km/h, what was its initial speed when it began accelerating? Express your answer in km/h I can do it but I just don't know how I'm ...

english
in which sentence is the essential clause underlined A. Eve's sister, {who loves opera,} took her to a performance B. Eve, {holding her program,} waited for the curtain to go up C. The soprano, {visiting from canada} had long black hair*** d. The person {who sells ...

english
21.b 22. b those was my second oppion

english
21. identify the appropriate punctuation for the underlined word or phrase In High School, I enjoyed reading (The Catcher in the Rye)<<underlined A. underlined B. italics c. quotation marks d. none 20. identify the appropriate punctuation for the underlined word or ...

english
24. identify the word or words in the sentence that need to be capitalize will you be coming o the stadium to watch the giants play sunday? a. Will,Sunday b. Will,Gaints,Sunday** C. Will D. none 23. Identify the word or words in the sentence that need to be capitalize does ...

Math
The daily temperature is decreasing at a rate of 2 degrees Fahrenheit T represent the daily high temperature now right then expression for the high temperature in five days the current at high temperatures need to address for hi-fi high temperature in five days check into you ...

Chemistry need asap
What do you mean convery each of the mols to HNO3 produced? My NO=.016 My O2=.013 My H20=.66

Chemistry need asap
Situation: The Production of Nitric Acid can be achieved by the following process: Nitrogen monoxide gas(NO) + diatomic oxygen gas+ water (liquid) ===> Nitric Acid (aq) a. Show complete balanced reaction for process What I have: 4NO+ 3O2+ 2H2O > 4HNO3 b. The lab ...

Math
5, 35, 245 can you find the other one?

Math
1/4= x-y 1 = 4x-4y (1-4x)/4 = y

Math
5(7 - 3) is this what you mean?

Math
L = 2w -16 2L + 2W = 100 substitute for "l" 2(2w-16) + 2w = 100 4w -32 + 2w =100 6w = 132 Can you finish from here?

Algebra 1
square the x value and multiply by 3.. if that value equals H(x) or y. 3(1)^2 = 3 this one works. 3(1)^2 = 3 not 9 so the second point doesn't lie on the function. Your try the last 2

science
Oh and last thing is how does half-life work

science
What is the geologic time scale and what are some thing scientists use it for (at least two things)? Here's my answer could you please verify. the geologic time scale is a record of the geologic events and life forms in Earth’s history. Scientists use it to understand...

Math
Kenny reads 4/9 page in 3/4 minute Kenny's unit rate is (what) page per minute

Math, Algebra
you are welcome

Math, Algebra
(3y-6)/3 <= -6 3y-6 <= -18 3y <= -24 y <= -8 (4y-8)/2 > 6 4y-8 >12 4y > 20 y > 5 with OR the solution is y is less than or = -8 or y>5

Maths
x= larger y= smaller x-y = 24 x= 4y 4y -y =24 3y = 24 y = 8 x = 32

Math
x + y = 27 x = 2y 2y + y = 27 3y = 27 y = 9 x = 18

Matg
15 4/4 -10 1/4 = 5 3/4 5 3/4 + 7 2/4 = 12 5/4 = 13 1/4

Algebra 1
3.25 + .65x <= 6 .65x<= 2.75 divide by .65 to get your answer.

Math
g = 24+C c = a +35 a+g+c =100 can you finish from here?

math
30/18 = L/27 5/3 = L/27 3L = 5(27) L = 45

Math
10 times 25 = 250 200 + 250 = 450 feet blow

Math
.5 = 5/10= 1/2 3/8 is less than 1/2 18/8 = 2 1/4 or 2.25

math
5 times 1.8

Maths
You want factors of 4 and -3 since they multiply to equal 12 and add to be the 1 in front of the x. you should have x = 3 and x = -4 When I worked with the first and third, I got (x-3)(x+2) x = 3 x = -2 so the x=3 showed up twice. Substitute it in each of the 3 equations to ...

Math please help
-x/(x-5) + 7x/(x^2 -3x-10) -x/x-5) + 7x (x-5)(x+2) The first fraction needs a denominator of (x-5)(x+2) Multiply the num and denom by x + 2 -x^2 -2x +7x = -x^2 +5x num over (x-5)(x+2) num factor -x(x-5) cancel the x-5 -x/(x+2)

math
7. The tennis team is selling key chains as a fundraiser. If its goal is to raise is at least 180, how many key chains must it sell at $2.25 each to meet that goal? Write and solve an inequality. a. 2.25k (greater than or equal to) 180; k (greater than or equal to) 100 b. 180k...

math
On a 28-question test, there are 2-point questions, 4-point questions, and 5-point questions. The test is worth a total of 100 points. There are twice as many 2-point questions as 5-point questions on the test. How many 2-point questions are on the test?

English
Some have more than a hundred and some have none, its very colourful and you see it every morning someone please tell me the answer

Grammer
“I don't know, but it's hanging by its feet,” chirped Flitter

Grammer
What is the simple subjects and simple predicates?

Grammer
i don't know, but it's hanging by its feet chirped flitter What is the complete subject and complete predicates

Economics-Macro
Suppose you borrow $100 of principal that must be repaid at the end of two years, along with interest of 4 percent per year. If the annual inflation rate turns out to be 8 percent, (a) What is the real rate of interest on the loan? (b) What is the real value of the principal ...

Economics-Macro
Help please?

Algebra2
It looks like inverse, x doubled from the 1st to second point and y became 1/2 as much. from 5 to 15 tripled 2 to 2/3 became 1/3

math
1/2 (n) - 6 = 4 add 6 then divide by 2.

6th grade algebra
To get the number of feet you have to take the square root of 7410 then divide that answer by 13 to get "h"

Math
5280 feet = 1 mile 90/5280 = what part of a mile 60 seconds in 1 minute and 60 minutes in 1 hour divide 1.9/3600 what part of an hour to get mph, divide the first answer by the second.

Statistics
10 disks 7 or 8 makes 2 possibilities 2/10 = 1/5

MATH
8 divided by 5 = 1.6 so 1.3 is not correct.

Math
I agree.

math
d = rt 360 = (x -t)33 360= (x+t)22.25 360 = 33x-33t 360 = 22.5x - 22.5t Can you solve from here?

Science
use fltrationm. go away. let it blow up and let water pass through

Math
(12-9)/sd = 2.5 I got 2.5 by finding the inv of .0062 3/sd = 2.5 3/2.5 = sd sd = 1.2

Statistics
A confidence interval is found by adding and subtracting the margin of error. If we take the difference of 235.1 and 197.2 and divide by 2 we have the margin of error. this margin of error is found by taking 1.96 times the standard deviation. To find the standard deviation ...

Math
Do you mean something like (10-2) x 25 = 250 -50 = 200 then 200 (20-3) 4000 - 600 = 3600

Statistics
0 because if all scores are 80 the mean is 80 and all values are 80 so there is no spread in the data.

Statistics
a) a 30 instead of a 3 gives us more variability in the data.

Physics
An automobile leaves the store, first going south at 88 km/h for 2 hours, and then turns on a road heading 20 degrees east of north at 55 km/h for 1.5 hours. Calculate the (x,y) components of the net displacement of the automobile from the starting position, where the x-axis ...

Math
65t -50t =97.5 15t = 97.5 divide by 15 to find time in hours

math
(1/7)^4

math
This is a right triangle. The legs are (x+20)1 and 1x (x+20)^2 +x^2 = 450^2 2x^2 +40x + 400 = 202500 2(x^2+20 x + 200) =202500 x^2 + 20x + 200 =101250 x^2 + 20x -101050 = 0 Can you finish from here?

algebra
The line has a slope of 3 because y = mx+b where m is the slope. Perpendicular lines have slopes that are negative reciprocals. So we have a 3 which makes our perp line's slope -1/3 If you multiply the two slopes you will always get a -1 if the lines are perpendicular If ...

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