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Posts by anon

Total # Posts: 2,768

Calc
A patient receives a 3 ml dose of medicine. The amount, y, of medicine in the body decreases at a rate of 15% per hour (dy/dt=-.15y). When the medicine in the patient is down to 1 ml, the nurse administers a second 3 ml dose and plans to give the patient a third dose when the ...

Calculus
For the parabola y^2=4px, where p, the focal length, is a constant, the focal point, f(p,0), is on the x-axis. Point S is 10 units from the point F and the segment SF makes a 60degree angle with the x-axis. The slope of segment TF is twice the negative of the slope of the ...

social studies
1. C 2. C

chemistry
The oxygen from the air could cause the hydrogen to ignite.

science
Yes, A is correct.

math
ms. sue that is a link to a different question

science PLEASE CHECK MY ANSWERS
1. C 2. B 3. A 4. B

science
Thank you Amy.

CALCULUS
The region R is bounded by the x-axis, y-axis, x = 3 and y = 1/(sqrt(x+1)) A. Find the area of region R. B. Find the volume of the solid formed when the region R is revolved about the x-axis. C. The solid formed in part B is divided into two solids of equal volume by a plane ...

CALCULUS HELP PLZ
The region R is bounded by the x-axis, y-axis, x = 3 and y = 1/(sqrt(x+1)) A. Find the area of region R. B. Find the volume of the solid formed when the region R is revolved about the x-axis. C. The solid formed in part B is divided into two solids of equal volume by a plane ...

statistics
Some students were asked, "Would you date someone with a great personality even though you did not find that person to be attractive?" Of the 131 women surveyed, 61.1% said yes, and of the 61 men surveyed, 42.6% said yes. Is there sufficient evidence to conclude that...

statistics
A researcher believe that college students spend a different amount of time talking on the phone than they do instant messaging. She takes a random sample of 12 college students and records the number of hours per week each student spends on each activity and plans to test at ...

Maths
Cheater! I am doing the maths challenge too and this isn't fair to the other students.

science
I took this, and the answers are: 1. B 2. A 3. C 3. C

math, calculus
1. Consider the region bounded by the curves y=|x^2+x-12|, x=-5, and x=5 and the x-axis. A. Set up a sum of integrals, not containing an absolute value symbol, that can be used to find the area of this region. B. Find the area of the region by using your answer from part A. ...

Algebra - HELP!!!
Who knows

Probability
re: E[X^2]: Remember that Var[X] = E[X^2]-(E[X])^2 and also that (in short-hand) Var[X] = E[Var] + Var[E]. Use this last identity to get Var[X]; we already have E[X] so we can easily get E[X^2].

Probability
Because the variance of the sum of two RV's is only equal to the sum of the variances if the two RV's are independent. If the two RV's are dependent then the variance of the sum of the two RV's = sum of the variances + 2*COV(the two RV's)

science
yeah its A

Math
76

Math
We are learning about proofs. We drew lines between noncollinear points. Our table showed 2 points >> 1 line segment, 3 point >> 3 line segments, 4 points >> 6 line segments, 5 points >> 10 line seg, 6 points >> 15 line seg. etc. Write an ...

Social Studies
B C C A D

Physics (Rotation)
In the figure, wheel A of radius rA is coupled by belt B to wheel C of radius rC. The angular speed of wheel A is increased from rest at a constant rate α. Find the time needed for wheel C to reach angular speed ω assuming the belt does not slip. (Hint: If the belt ...

Social Studies
And who are you "STOP"? :-)@

Help Ms.Sue!!! Social Studies
A B D B B 100%

Science/Biology
Please check my answers: 1. Which of the following correctly states the relationship between monkeys and humans? A. Humans and monkeys evolved from apes. B. Humans evolved from monkeys. C. Humans and monkeys evolved from the same ancestor, which is now extinct. D. Humans ...

English
List as many details as you can for each of the topic sentences. 1. Walking briskly for a mile after a day sitting at a desk helps dispel fatigue. Purpose: To explain 2.Bird watching in the woods is relaxing as well as educational Purpose: To convince

Science
anyone at all?

Science
please help me

Science
fill in the blank questions monotremes, marsupials, and placentals have the same _____ known as the therapsid. a farmer sprays insecticide on his crops and notices that the insect pest problems disappear. a year later he tries the same insecticide only to find that he did not ...

social studies(updated answers)
The answers are CAACD.

calculus and vectors
Determine an equation of the line of intersection of the planes 4x − 3y − z = 1 and 2x + 4y + z = 5.

Math
Use the following four coordinates to determine which one has a distance of 10 units from point C (1, 2). (3, 4) (7, 1O) (6, 7) (8, 9)

American History
The answer would be D) Harriet Beecher Stowe. He wrote Uncle Tom's Cabin in 1852 before the American Civil War.

Economics HELP PLEASE!!!!
Yes how about this one? Suppose that firms are NOT owned by consumers. Let s denote the size of the per-unit subsidy/tax given to the firms. Let positive values of s denote subsidies, and negative values of s denote taxes. QUESTION: What is the value of s that maximizes total ...

us history
Thank you iris!

AP Calc
The base of a solid is bounded by y=|x|+a, <a<, and the line y=3. Find, in Cu. units in terms of a, the volume of the solid if every cross section perpendicular to the y-axis is an equilateral triangle.

Statistic Help please
IT IS no; no 20% CONFIRMED 100%

AP Calc
If x=e^t and y=t^2-3, then for what values of t, t>=0, is the function y=f(x) concave up?

AP Calc
The coordinates of the point on the curve cos(y)=x-y, -pi<=x<=pi, where the tangent line to the curve is a vertical line is ____.

AP Calc
The base of a solid is the region in the first quadrant bounded by the ellipse x^2/a^2 + y^2/b^2 = 1. Each cross-section perpendicular to the x-axis is an isosceles right triangle with the hypotenuse as the base. Find the volume of the solid in terms of a and b. I'm having...

AP Calculus
Approximating the integral from 0 to 6 of (e^x dx) by 3 circumscribed rectangles of equal width on the x-axis yields ____. a) 2e^2 + 4e^4 + 6e^6 b) 2(e^2 + e^4 + e^6) c) 2(e + e^3 + e^5) d) e + 3e^3 + 5e^5 e) e^2 + 3e^4 + 5e^6

Math
idiots

AP Calculus
The average area of all squares with sides between a inches and b inches (b>a) is ____ in^2.

AP Calculus
The base of a solid is bounded by y =|x|+a, 0<a<3, and the line y=3. find in cu. units in terms of a, the volume of the solid if every cross section perpendicular to the y-axis is an equilateral triangle.

chem.
given: Ea= 66.58 kj/mol=66,580 j/mol T1=298.15k K2=4.5 (K1) find: T2 solution: ln (k2/k1)= Ea/R (1/T1-1/T2) ln (4.5 k1/k1) =Ea/R ( 1/298.15k-1/T2) T2=316 K Hope that helps 👍

Science 6th grade Earth's day and night ANSWERS
Queen Elsa is right

Science 6th grade Earth's day and night ANSWERS
The answers are correct.

science(check answers)
a d b c

science(check answers)
thanks emily <3

science(check answers)
THANKS EMILY <3

science
An atom of sodium-23 (atomic number = 11) has a positive charge of +1. Given this information, how many electrons does it have? How many protons and neutrons does this atom have?

science
A hydrogen atom has one proton, two neutrons, and no electrons. Is this atom an ion?

Probability
Anyone know answer to 2?

Geometry
In baseball, the length of the path between each pair of consecutive bases is 90 feet. The paths form right angles. How far does the ball need to travel if it is thrown from home plate directly to second base? A. 90 feet B. 127.3 feet C. 135.7 feet D. 180 feet

English
lmao wtf

MATH
I agree with tbetzz

MATH
But why would you subtract the 576 and 144. and plus to find the circumference you were supposed to times the 576 by pi and the 144 by pi

Physics
its 54.7 km/s

RATIO
dezz nuts

Geometry
A trapezoid has a perimeter of 14 feet. What will the perimeter be if each side length is increased by a factor 7? A. 21 feet B. 98 feet C. 196 feet D. 686 feet This one is def B correct?

Geometry
A rectangle has an area of 6 square meters. What will be the area of the rectangle if each side length is increased by a factor 5? A. 11 square meters B. 30 square meters C. 125 square meters D. 150 square meters I think the answer is B

Geometry
Is it D?

Geometry
A rectangular prism has a base that is 5 cm by 7 cm and a height of 12 cm. If all dimensions are doubled, what happens to the volume? A. When the dimensions are doubled, the volume is twice the original volume. B. When the dimensions are doubled, the volume is three times the ...

Geometry
A triangle is enlarged by a factor of 3. The perimeter of the new triangle is 36 feet. What could be the lengths of the sides of the original triangle? A. 3 feet, 4 feet, and 5 feet B. 1.5 feet, 1.25 foot, and 1.25 foot C. 2 feet, 0.5 feet, and 1.8 feet D. 4 feet, 4 feet, and ...

Geometry
The circumference of a circle changes from 20 to 4 after a dilation. What was the scale factor of the dilation? A. 1/25 B. 1/5 C. 5 D. 25

Geometry
A circle with a radius of 1/2 ft is dilated by a scale factor of 8. Which statements about the new circle are true? Check all that apply. A.The length of the new radius will be 4 feet. B.The length of the new radius will be 32 feet. C.The new circumference will be 8 times the ...

Geometry
What is the height of a cylinder with a volume of 384π cubic inches and a radius of 8 inches? Round to the nearest tenth of an inch.

Geometry
A cylindrical water tank has a diameter of 20 feet and a height of 15 feet. How much water is needed to fill the tank?

Science
did you ever find the answer

Science
I got 100% 1/ true 2/ D 3/ B 4/ D

social studies
wait are they actually???

math- calculus
You will often see proj (Vector a onto Vector b) written as projb⃗ a⃗ .Show that projb⃗ a⃗ =(a⃗ ⋅b⃗/ b⃗ ⋅b⃗ )*b⃗ .

Physics
a)5368 N b)5.5 s c)15.24 m d) 2.74 s

Science One Question! Help ASAP!!!
Fluttershy you're stupid. "You're" = You are. It would be Your opinion. Your Research. Don't try to act smart if you don't know the difference between you're and your.

Science One Question! Help ASAP!!!
I agree ! ^

physics
(a) A car with a mass of 950 kg is moving to the right with a constant speed of 1.45 m/s. What is the total force on the car? (b) What is the total force on the car if it is moving to the left?

math
A stairway runs up the edge of the pyramid. From bottom to top the stairway is 92 m long. The stairway makes an angle of 70° to the base edge, as shown. A line from the middle of one of the base edges to the top of the pyramid makes an angle of elevation of 52° with ...

Black Death
I have to do a powerpoint on the Black Death. Where can I find the best information to write about it?

SCIENCE HELP ASAP! :)
those answers are wrong, I got 40%. Yayy now I'm failing

Social Studies
ANONYMOUS IS CORRECT 100%

Geometry
Is it B?

Geometry
How does the volume of a rectangular prism change if the width is reduced to 1/10 of its original size, the height is reduced to 1/4 of its original size, and the length is reduced to 2/3 of its original size? A. V=1/120lwh B. V=1/60lwh C. V= 2/3lwh D. V=3/4lwh

MATH
David wants to reduce a rectangular image on his computer so that the new image has 25% of the area of the original image. How should David modify the image? Justify your answer.

MATH
Drew has a rectangular postcard that is 6 inches long and 4 inches wide. He uses a photocopier to enlarge it, so that the length and width are 1.5 times as long as those of the original postcard. Explain how the perimeter and area change.

Geometry
Thank you so much oh my god

Geometry
How does the volume of a square pyramid change if the base area is quadrupled and the height is reduced to 1/9 of its original size? A. V= 1/27Bh B. V= 4/27Bh C. V= 2/9Bh D. V= 4/9Bh

Geometry
but that's not a choice. A. 1/6 B. 1/3 C. 3 D. 6

Geometry
The volume of a square pyramid is equal to _____ times the volume of a cube where the bases are the same, but the square pyramid is half the height of the cube.

Geometry
If a cylinder’s radius and height are each shrunk down to a third of the original size, what would be the formula to find the modified surface area?

Calc
Find the coordinates of the point on the curve xy=6 in quadrant I where the normal to the curve passes through the origin.

calc
The slope of the tangent to the curve y=f(x) is given by (1/9)(x^2)(y^2). The curve passes through the point (3,1). Find the value of y when x=3*cubedroot(3).

Calc
it wasn't a typo.. how did you get 10?

Calc
Let f be the function that contains the point (-1,8) and satisfies the differential equation dy/dx=10/(x^2+1) (a) Write the equation of the tangent to f at x=-1. (b) Use your equation in part a to estimate f(0). (c) We know that the integral from -1 to 0 of 10/(x^2+1) equals ...

science
Oh Baka why don't you just leave them alone, if they're "cheating" why would you make an account on here?

Geometry
Andrea has a yard shaped like parallelogram ABCD. The garden area, parallelogram EFGB, has an area of 105 ft. If Andrea wants to sod the rest of her yard, how many square feet of sod should she order? A. 765 ft B. 840 ft C. 945 ft D. 1,515 ft

Math :-)
Explain why knowing the height is needed when finding the perimeter of a right triangle.

Geometry
Maria is making a stained glass window in the form of a kite. The width of the window must be 15 in., and she only has enough stained glass to cover 60 in. What should the height of the window be? A. 4 in. B. 6 in. C. 8 in. D. 12 in.

Classical mechanics
Hi juanpro is there other classical mechanic. I might want to join too.

Plz, plz help! SS
Whats that Nicole M??

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