# Posts by ANdy

Total # Posts: 963

Science
how many atoms are in 0.64 moles of strontium

Math
A zoo wishes to construct an aquarium in the shape of a rectangular prism such that the length is twice the width and 5m greater than the height. If the aquarium must have a volume strictly between 1125m^3 and 3000m^3, determine the restrictions on the length of the aquarium.

Statistics
The mean salary of 5 employees is \$34300. The median is \$35500. The mode is \$36200. If the median paid employee gets a \$3000 raise, then what is the new mean, median, mode?

Algebra
Find all of the points of the form (x, ?1) which are 4 units from the point (3,2)

Pre-Calculus
A drug manufactured by a pharmaceutical company is sold in bulk at a price of \$150 per unit. The total production cost (in dollars) for x units in one week is C(x) = 0.02x^2 + 100x + 3000. How many units of the drug must be manufactured and sold in a week to maximize the ...

chemistry
while chloromethane is reactive towards nucleophiles, the Grignard reagent produced from chloromethane is reactive towards electrophiles. pl explain

Calculus and Vectors
Determine the net result of a 35 N force and a 20 N force acting on an object at an angle of 125° to each other, using components. I know that when I draw the vectors, I use parallelogram law to determine the complimentary angle, and I got 55degrees. However, on the ...

statistic
Although there is a popular belief that herbal remedies such as Ginkgo biloba and Ginseng may improve learning and memory in healthy adults, these effects are usually not supported by well-controlled research (Persson, Bringlov, Nilsson, and Nyberg, 2004). In a typical study, ...

Calculus - Related Rates
A road perpendicular to a highway leads to a farmhouse located 5 miles away. An automobile traveling on the highway passes through this intersection at a speed of 65mph. How fast is the distance between the automobile and the farmhouse increasing when the automobile is 1 miles...

Pre calc

pre calc
i was given this equation Tan(a+b)=sin(a+b)/cos(a+b) So I did (square root 8/3)(square root 15/4)+sin(1/4)cos(-1/3) divide that by (-1/3)(square root 15 over 4) - sin( square root 8 over 3)sin(1/4)

pre calc
tan(? + ?); cos(?) = ? 1/3 ? in Quadrant III, sin(?) = 1/4 ? in Quadrant II I am really struggling with this idk why I keep getting the wrong answers

Pre calc
sin(? + ?); sin(?) = 5/13 ? in Quadrant I, cos(?) = ? 2root 5 over 5 ? in Quadrant II please give final answer this is bc i have a lot of trouble simplifying the final answer thank you

Pre calc
it was incorrect again :(

physics
A bicycle traveling at 9.8 m/s needs to stop in a time of 5s. what coefficient of friction is required? Answer:0.2, can someone possibly show me how this is the answer? i keep getting something else.

Physics
9.) A 1 570 kg satellite orbits a planet in a circle of radius 5.94 x 106 m. Relative to zero at infinity the gravitational potential energy of this satellite is -9.32 x 1011 J. What is the mass of the planet?

Chemistry
thanks

Chemistry
What would be a good chemical blank to use for the Tollen's Test (Silver Mirror test)?

biology
physics osmosis

Calc
Compute ?y and dy for the given values of x and dx = ?x. y = x^2 ? 7x, x = 6, ?x = 0.5

Math 2
If your playing a game where you have 4 cards and you have to arrange them in to 2 digit numbers so they add up to a number near 100, and then you take the number you got and subtract it from 100, and then you play this game 7 times with 3 other people, and when you add up all...

Math
Three boys and three girls all celebrate their birthday today, but they are each different ages. The youngest is 1 years old. The sum of the ages of the three girls is the same as the sum of the ages of the three boys. What is the smallest possible total of all six ages?

Math
Suppose one person decides to carry out a random act of kindness for three people on Monday. On Tuesday, that same person is kind to three more people, and the three he/she helped on Monday each help three more individuals. If the same circumstances were to occur on Wednesday...

English
And what's the point of thus website if you can't help me?

English
No it is not an assignment. I read this at the end of a book and I wanted to know what it means

English
What is the meaning behind this quote: you've gotta dance like there's nobody watching love like you'll never be hurt sing like there's nobody listening and live like it's heaven on earth

Chemistry
In my upcoming lab we are extracting caffeine from tea through distillation. I was wondering why adding CaCO3 helps this process? Is it due to the basic nature of CaCO3 which decreases the polarity of the caffeine, making it less reactive with water?

math
a 6 foot red casts a shadow that is 7 feet long. the shadow of a nearby tree is 42 feet long. slove a proportion to find the height of the tree

physics
What is the initial angle 0f projection of a projectile for which the range and the maximum height are equal?

LA
Huh?

LA

LA
Rewrite using a possessive noun: the (separate) bikes of Keith and Frank, the brooms of the witches, and the dog of Mike and Erin

ellipse
Write the equation of ellipse that satisfy the following condition A)centre at c(-2,3),one focus is f(-2,7) and one vertex is v(-2,10). B) centr at c(-1,2) focus at F(-1,5) and passes through point P(5,6).

physics
Geostationary satellites are placed on orbits of radius 4.2×10^4m use this information to deduce g, the acceleration of freely falling body, at this height.

physics
At ground level g is 9.8meter per second square. Suppose the earth started to increase its angular velocity. How long would a day be when the people on the equator were just 'thrown off' why is the expression thrown off is a bad one?

list of companies that uses decision making process?

Science
Why Emma why

Ela
1. reprisal 2. rationale 3. impasse 4. flippant 5. perception 6. relentless 7. congenial 8. rapport 9. prone 10. prompt

Social studies (Help)
I'd agree with you.

Algabra
Dick is younger than Tom, but older than Harry. Their ages in years are consecutive odd integers. Dick's mother is three times as old as Dick, and she is also 13 years older than twice as old as Tom. How old are Harry, Dick, and Tom

phsyics
The x and y components of a certain force are measured and found to be Fx = (68 ± 3)N and Fy =(42 ± 2) N, respectively. Calculate the magnitude of this force? expressing your result to the proper number of significant figures.

Life Orientation
Battery cages

Phy.Chem
Need some help :) Thanks! A sample of a glass occupies a volume of 525 ml at 625 mm Hg. At constant temp, what will be the new volume when the temp changes to the ff: a.) 1.5 atm b.) 455 mm Hg

It is required to titrate ethanol solution .Being available a 0.2mol/l potassium dichromate solution and 4mol/l sulfuric acid solution on the presence of a convenient indicator. a)indicate the glassware used for titration. b)give a brief description of the procedure followed ....

Physics
In the figure, a small 0.125 kg block slides down a frictionless surface through height h = 0.958 m and then sticks to a uniform vertical rod of mass M = 0.250 kg and length d = 2.32 m. The rod pivots about point O through angle θ before momentarily stopping. Find θ.

English
1. Predominant 2. Default 3. Confiscate 4. Decipher 5. Concurrent 6. Recession 7. Prerequisite 8. Constitute 9. Nominal 10. Hypothetical

Math
Lisa and Katie are playing a card game, and a total of 900 points has been scored. Lisa scored 400 more points than Katie. If you let l= l= the number of points that Lisa scored, and k= k= the number of points that Katie scored, then the problem can be represented by the system:

math
I would think so.

math
Think of counting by 5's. 5, 10, 15, 20, 25 and so on. *Pretty sure, first time I'm answering on here.* (:

Finance
You want to be able to withdraw \$25,000 from your account each year for 20 years after you retire. If you expect to retire in 25 years and your account earns 7% interest while saving for retirement and 6.7% interest while retired Round your answers to the nearest cents as ...

math
What is 78 / 9 x 3 + (6 - 9)?

Collage Physic
A uniform rod hangs vertically on a frictionless horizontal axle passing through its center. The rod is 35cm long and 85g. A 15g ball of clay travelling horizontally at 2.5cm/s hits and sticks to the bottom of the rod. What is the maximum angle the rod makes with the vertical ...

Physics
A 66.0 kg rider sitting on a 9.4 kg bike is riding along at 9.1 m/s in the positive direction. The rider drags a foot on the ground and slows down to 7.0 m/s still in the positive direction. What is the change in momentum of the rider and bike?

Physics
A 25 g bullet with a muzzle velocity of 300 m/s is fired into a board 4.0 cm thick. For a soft board, the bullet goes through the board and emerges with a speed of 50 m/s. What was the average force exerted on the bullet by the board? Answer= 27344 N Show Work

Maths sequences
Thank you !

Maths sequences
Question= Find the sum of all the odd numbers up to and including 99,999. Would a=1 because its the first odd number in the sequence? And would d=2 ? So then would you do S99,999= 49999.5(2+99,998(2)) Then divide by two?

math
5/8 x+ 1/16 x = 3/16 + x x= - 3/5 I'm trying to verify my answer. these are fractions

Math
idk what but, 10.5 divided by 3 is 3.5

math
a recipe calls for 5/7 cup of granola. how much is needed to make half the recipe.(1/2)(5/7)= 5/14 Is this correct?

Physics
It's my first time taking physics, how would I get to the answer?

Physics
A tennis player strikes a ball when it is 1 m above the ground, with a velocity 17 m/s at 30 degrees above the horizontal. The net is 4 m away horizontally and it is 0.6 m high. How high, vertically, above the net does the ball pass?

art
how Picasso used shape or form in the Weeping Woman, and the effect of that usage on the artwork.

math
what is pi

science
I need an acrostic poem about forces

Physics
A person who is 1.6 m tall throws a ball with a speed of 6.4 m/s at an angle of 65 degrees above the horizontal. What are the x and y components of the velocity (in m/s) of the ball the instant before it strikes the ground?

Hinigaran, math
Four numbers are in the ratio 1:4:5:8. If the largest is 144, what is the sum of the four numbers?

math
Nina has a stick 5 ft. long. She saw it into 8 equal length pieces. How long will each piece be? Fraction Would it be 5/8 or 8/5 confused

math
Straight Numeric and Terminal Digit Filing i don't understand it at all

History of Muslims
1)what is the reason for the battle of uhud? 2)why did Wahshi al habashi want to kill hamza (the prophet mohammad's uncle)? 3) What was the prophet's plan on this battle ? 4)how many soldiers were in the muslims army and in the meccan army? 5)Why did the muslims lose ...

Physics
Two particles, of mass m and mass nm, undergo a head-on, fully elastic collision. (Here n is just a unitless number.) Before colliding the particles approach one another with equal speed v. Snapshots of the particles before, during, and after the collision are shown above. ...

Math
?BCD ? is a right triangle. The length of the hypotenuse is 18 cm. The length of one of the legs is 14 cm. What is the length of the other leg? Enter your answer in the box as a decimal rounded to the nearest tenth.

economics
quainty would go down

Science Urgent😖😖😖
Organisms need to reproduce so they can keep species going.

History
Check my homework? Choices: A. Barbed-wire fences, B. windwills, C. steel plows, D. McCormick Reaper, E. railroads Question: Life on the prairie was difficult for everyone. But there were ways to succeed. Match the problems homesteaders faced with possible solutions. little ...

History
Check my homework? Choices: A. Barbed-wire fences, B. windwills, C. steel plows, D. McCormick Reaper, E. railroads Question: Life on the prairie was difficult for everyone. But there were ways to succeed. Match the problems homesteaders faced with possible solutions. little ...

AP Calculus AB
Hello! I'm having trouble with this related rates problem: A 5ft tall person is walking away from a 16ft tall lamppost at a rate of (2/x) ft/sec, where x is the distance from the person to the lamppost. Assume the scenario can be modeled with right triangles. At what rate ...

Pre-Algebra
\$85

physics
Solve it pls?

physics
yeet

MATH HELP

lee
3 tens+7 thousands+5 ten thousands+2ones+6 hundreds

algebra, numerical operation
Danny made a mistake in the following problem. Each line shows the steps Danny took in order to solve the problem. The mistake was made in Line ___. Only input the number of the first incorrect line. Line 1 21 + 35 ÷ 7 + 6(2) Line 2 21 + 5 + 6(2) Line 3 21 + 11(2) Line ...

math
thanks steve

math
a pantry contains 6 shelves each 42 inches long. the shelves are to be reclined with fresh paper. the paper is sold in 1 yard rolls. the number of 1 yard rolls needed is:

Maths Lit, Accounting, Economics, Business Studies
I am a grade 10 learner doing Maths Literacy, Accounting, Business Studies, Economics, Life Orientation, English and Afrikaans I want to know what Degree I can study in University and also to check what career path I would be able to do.

Calculus
1. Provide an example of a function f that is continuous at a = 2 but not differentiable at a = 2. 2. Provide an example of a function g that is differentiable at a = 3 but does not have a limit at a = 3. Thanks!

To Ms. Sue
Hey Ms. Sue! I've got a question How well do you know everybody's questions? Like how do you know everything? That's all I want to know.

English
craniectomy sounds weird. I'll have to go with this.

Calculus, derivatives
The curve is given by x^2+2r(sqrt(y))=xy What is dx/dr when y is constant?

Spanish
It looks cool of when you talk Spanish

Language Arts
It's A

math

Math.
1- B 2- A 3- A 4- B 5-D

math
a large piece of cadboard, 5cm by 8cm to be made by cutting out sqaures in each corner. find dimensions that will maximize the volume? vol= (8-2w)(5-2w) (w) answer= 1cm and 10/3 cm is this correct?

Calculus
1. Prove that, among all rectangles with fixed perimeter p, where p > 0, the largest in area is a square. 2. A 2 × 3 array of six congruent rectangular pigpens (that all look the same from above) will be in the overall shape of a rectangle R. We may use 100 feet of ...

math
Thanks!

math
Nolan practices the piano for 1 2/5 hours every Saturday and Sunday. How long does he practice each weekend? Express your answer in hours and minutes.

chemistry
Suppose a reaction has the equilibrium constant K = 2.3 10-7 at a particular temperature. Will there be a large or small amount of unreacted starting material present when this reaction reaches equilibrium? a)There will be a small amount of unreacted starting material present ...

math
F: 9 M: 13 L: 6

la check
which of the following is not a major point of view first person third person fourth person limited (THIS ONE)

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