Sunday

February 26, 2017
Total # Posts: 728

**Math**

Got this one. Its 1/24 correct?

*April 9, 2015*

**Math**

Suppose f(x) = 4x^5-(1/x^4) Find the slope of the tangent line to the graph of y = f^–1(x) at (3, 1). You get: 1/24 1/16 00062 1620 972

*April 9, 2015*

**Calc AB**

Are you possibly Steve Hawkins? Your getting this one after another.

*April 9, 2015*

**Calc AB**

Suppose that f(x) is an invertible function (that is, has an inverse function), and that the slope of the tangent line to the curve y = f(x) at the point (2, –4) is –0.2. Then: (Points : 1) A) The slope of the tangent line to the curve y = f –1(x) at the point...

*April 9, 2015*

**Math**

It was B

*April 9, 2015*

**Math**

B??

*April 9, 2015*

**Math**

derivative: sin(pi*cosx) = -pi sin(x) cos(pi cos(x))

*April 9, 2015*

**Math**

Inverse of sin(pi*cosx) = cos^(-1)((sin^(-1)(x))/pi) Derivative of cos^(-1)((sin^(-1)(x))/pi) is -1/(sqrt(1-x^2) sqrt(pi^2-sin^(-1)(x)^2))

*April 9, 2015*

**Math**

Suppose f(x) = sin(pi*cosx) On any interval where the inverse function y = f –1(x) exists, the derivative of f –1(x) with respect to x is: a)-1/(cos(pi*cosx)), where x and y are related by the equation (satisfy the equation) x=sin(pi*cosy) b)-1/(pi*sinx*(cos(pi*cosx...

*April 9, 2015*

**Calc AB**

c)(1/2)x^(-1/2) is the correct answer

*April 9, 2015*

**Calc AB**

Wait f^-1(x) is 2sqrt(x) so then the derivative of that is 1/sqrt(x)

*April 9, 2015*

**Calc AB**

That would be 1/(dy/dx) of x^2-4x+4 which would be 1/2x-4 correct?

*April 9, 2015*

**Calc AB**

Suppose that y = f(x) = x^2-4x+4 Then on any interval where the inverse function y = f^–1(x) exists, the derivative of y = f^–1(x) with respect to x is: a) 1/(2x-4) b) 1/(2y-4), where x and y satisfy the equation y=x^2-4x+4 c)(1/2)x^(-1/2) d)(1/2)x^(1/2) e) Both 1/(...

*April 9, 2015*

**Calculus AB**

Yep I was correct

*April 9, 2015*

**Calculus AB**

well lets see. Since f^-1(x) = 9-x^2 then the derivative of 9-x^2 is -2x correct?

*April 9, 2015*

**Calculus AB**

For the function f(x) = sqrt(9-x), which is equal to d/dx(f-1( -1 is the inverse)(x)) a) -2x b) sqrt(x) + 9 c) x^2 + 9 d) 2x e) 9-x^2

*April 9, 2015*

**Calculus**

Answer is 1/(2y-4) where x and y are related by the equation (satisfy the equation) x=y^2-4y+5 x>= 1

*April 9, 2015*

**Calculus**

inverse of x^2 - 4x +5 is 2±sqrt(x-1) and the derivative of that is (2x-4) but I don't know how to get the x>= 1 or x>= 2

*April 9, 2015*

**Calculus**

For the function f(x) = x^2 - 4x +5, x>= 2, which is equal to d/dx (f-1 this is the inverse)(x)) ? 1/(2y-4) where x and y are related by the equation (satisfy the equation) x=y^2-4y+5 x>= 1 2y-4 where x and y are related by the equation y= = x^2 - 4x +5, x>= 2 1/2x-4 ...

*April 9, 2015*

**Calc AB**

I believe that it is Either I or III

*April 9, 2015*

**Calc AB**

Remember that f(x) must be one-to-one (only one y-value for each x-value) over the domain where f –1(x)is defined as a function. So, in some cases you must restrict the domain of f(x) so that it's one-to-one. There might be more than one section of domain that's ...

*April 9, 2015*

**Calc**

Figured it out. 33/2

*April 9, 2015*

**Calc**

Find the area of the region bounded by the curves y2 = x, y – 4 = x, y = –2, and y = 1. So far I have found that the area of the trapezoid which is 13.5. But for the other two areas I cannot find them. They could be: 27/2 22/3 33/2 34/3 14 I believe that it is 14 as ...

*April 9, 2015*

**Physics**

A rock is thrown directly upward from the edge of the roof of a building that is 35.3 meters tall. The rock misses the building on its way down, and is observed to strike the ground 4.00 seconds after being thrown. Neglect any effects of air resistance. With what speed was the...

*March 21, 2015*

**science**

Measuring the speed of light through gelatin using a laser

*March 4, 2015*

**algebra**

Use the formula d = 1.22ãx to estimate how many miles a 5-foot-tall person can see standing on the deck of a ship that is 50 feet above the ocean.

*February 9, 2015*

**Physics**

A gardener pushes a mower at a distance of 900 m while mowing the yard. The handle of the mower makes an angle of 40.0 with the ground. The gardener exerts a force of 35.0 n along the handle of the mower. How much work does the gardener do in mowing the lawn?

*January 26, 2015*

**Science**

no its alleles

*November 6, 2014*

**science**

Hey thanks.

*November 6, 2014*

**science**

is a starch a complex carboydrate

*November 6, 2014*

**science**

is a complex sugar an example of a starch? is a simple sugar an example of glucose?

*November 6, 2014*

**science**

are starches and glucose all types of carbohydrates?

*November 6, 2014*

**Math**

Find the coordinates of the point at 180 degrees on a circle of radius 3.4 centered at the origin. Round your answers to three decimal places, if required. ( , 0 ) I got 0 as the y coordinate. Please help me solve for x

*October 24, 2014*

**math**

A craft store bought paint for a wholesale price of 100 the store charges a 65% markup what is the craft stores price for the paint.

*October 21, 2014*

**math**

From a box containing 5 blue marbles,10 red marbles,and 8 yellow marbles,Lisa removed 3 marble,one of which was blue.f she removes one more marble at random,what is the probability that it will be blur? a. 1/4 b. 5/21 c. 1/5 d. 2/7 e. 1/6 please answer and explain

*October 16, 2014*

**Math**

73-35

*October 16, 2014*

**maths**

95. Suppose that 387 people will travel on a space shuttle with room for 420 people.Each compartment seats 14 people before the next compartment opens.How many people will ride in the last compartment that opened?

*October 9, 2014*

**maths**

99. From a box containing 5 black marbles,8 pink marbles, 6 white marbles, and 5 yellow marbles, Kim removed 4 marbles,one of which was black.If she removes one more marble at random,what is the probability that it will be black? a. 1/6 b. 4/21 c. 1/5 d. 5/21 e. 1/4 please ...

*October 9, 2014*

**english 122**

when you contribute to a research conversation, which of the following skills is not strictly?

*October 9, 2014*

**Math**

identify the slope and y-intercept of y - 16 = -4x . so is the slope is -4 and y-intercept is 16 correct ?

*October 8, 2014*

**Physics**

Two small charges with a mass of 1.0 g each are connected by 2.0-cm-long insulating rod of negligible mass. Each ball has the same magnitude of charge of 10 nC, but with opposite sign. The rod is held in a 1.0 × 104 N/C uniform electric field at the angle of 30°, ...

*October 8, 2014*

**statistics**

42/310×100=13.5%

*September 28, 2014*

**Algebra**

I - Interest P - Principal r - Rate t - time (in years) a ) I = Prt = $16,000 * 0.09 * 5 = $7,200. She will pay $7,2000 in five years b) Assuming the lender agrees to a 3 year time, when a five year was originally scheduled. Some lenders would not agree to this because they ...

*September 24, 2014*

**algebra**

When reading some schematics of a rectangular garden you see the binomial x +8 feet represents the length and the binomial x - 1 represents the width. Write an expression that represents the total area of the garden in the form x2 (squared) + bx + c by using the distributive ...

*September 18, 2014*

**math**

Linda did 24 problems out of 25 correctly.In the next test she did twice as many examples correctly but received a mark only half as good.How many problems were there in the second test?

*September 18, 2014*

**math**

Age Group (Per cent) 46 and over (25) 40-45 (34.5) 35-39 (25.62) 30-34 (12.9) Under 30 (1.9)

*September 18, 2014*

**math**

Distribution of Employees in National Insurance Company by age groups:(for questions 76-78) Age Group Per cent 46 and over 25 40-45 34.5 35-39 25.62 30-34 12.9 Under 30 1.9 76. Thirty thousand employees of this company are 46 years or over.How many thousand(to the nearest 0.1 ...

*September 18, 2014*

**trigo**

An airplane travels on a bearing of 245 degrees at an airspeed of 200 kilometers per hour while a wind is blowing 50 kilometers per hour from 140 degrees. Find the ground speed of the airplane and the direction of its track, or course, over the ground.

*September 16, 2014*

**math**

A point,X ,is 25 feet from the center of a circle.If the diameter of the circle is 14 feet,what is the length (in feet)of a tangent from point X to the circle? a. square root 29 b. 18 c. 15 square root 2 d. 24 e. square root 673 please answer and explain

*September 14, 2014*

**PRINCIPLES OF PUBLIC SPEAKING PART II, SECTION 2**

Correct

*September 4, 2014*

**statistics**

Advertisers contract with Internet service providers and search engines to place ads on websites. They pay a fee based on the number of potential customers who click on their ad. Unfortunately, click fraud—the practice of someone clicking on an ad solely for the purpose ...

*August 11, 2014*

**physics**

Two boat landings are 8.0 km apart on the same bank of a stream that flows at 2.8 km/h. A motorboat makes the round trip between the two landings in 50 minutes. What is the speed of the boat relative to the water?

*August 10, 2014*

**math**

What is the value of 4^5 + 4^5 + 4^5 + 4^5 + 4^5 + 4^5 + 4^5 + 4^5 + 4^5 + 4^5 + 4^5 + 4^5 ? a. 12 x 2^5 b. 24^5 c. 3 x 2^5 d. 4^60 e. 3 x 4^6 please answer and explain

*August 10, 2014*

**math**

If the number of square inches in the area of a circle is equal to the number of inches in its circumference,the diameter of the circle is a. 4 inches b. 2 inches c. 1 inches d. pi inches e. 2 pi inches please answer and explain

*August 9, 2014*

**math**

I have 10 question like this, anybody can show me this one how to do it. Simplify the following and give answers in scientific notation: 0.00320 x 450,000 / 90,000

*August 8, 2014*

**math**

Write the set of integers that satisfy the sentence: I had 10 question for this,anybody can show this one how to do it. 4 > n > 0

*August 8, 2014*

**math**

In a certain boy's camp, 30% of the boys are from New York State and 20% of these are from New York City.What percent of the boys in the camp are from New York City? a. 60% b. 50% c. 33% d. 10% e. 6% please answer and explain

*August 8, 2014*

**math**

If the number of square inches in the area of a circle is equal to the number of inches in its circumference,the diameter of the circle is a. 4 inches b. 2 inches c. 1 inches d. pi inches e. 2 pi inches please answer and explain

*August 8, 2014*

**math**

If the circumference of a circle is the same as the perimeter of the square with a side as 4 pi in, what is the area of the circle in square inches?

*August 8, 2014*

**math**

I'm just helping my younger brother.

*August 7, 2014*

**math**

so, (2600-440)/4.5=480 answer c, thank you

*August 7, 2014*

**math**

If x = 1/x^2, then 2 + 3 = a. 13/36 b. 1/5 c. 5/6 d. 1/8 e. 5/13 please answer and show work

*August 7, 2014*

**math**

I don't understand what is the question mean

*August 6, 2014*

**math**

The approximate distance,S, in feet that an object falls in t seconds when dropped from a height can be found by using the formula S = 16t^2.In 8 seconds, the object will fall a. 256 feet b. 1,024 feet c. 1,084 feet d. 2,048 feet e. 15,384 feet please answer and explain

*August 6, 2014*

**Physics**

If the thickness of the probe in the direction of B is 1.97 mm, calculate the charge-carrier density (each of charge e).

*August 2, 2014*

**math**

is it answer c. 30 + 7c?

*May 30, 2014*

**math**

why -3 , because the first 3 minutes ?

*May 30, 2014*

**math**

10 cents per minute for the first 3 minutes = 30 cents ,but I don't know what is 10-c cents for each minute thereafter?

*May 30, 2014*

**math**

43. A phone company charges 10 cents per minute for the first 3 minutes of a call, and 10-c cents for each minute thereafter.What is the cost, in cents, of a 10-minute phone call?

*May 30, 2014*

**math**

type mistake: 10 cents per minute for the first 3 minutes = 30 cents

*May 30, 2014*

**math**

10 cents per minute for the first 3 minutes + 30 cents, but I don't know what is 10-cents for each minute thereafter?

*May 30, 2014*

**math**

43. A phone company charges 10 cents per minute for the first 3 minutes of a call, and 10-cents for each minute thereafter.What is the cost, in cents, of a 10-minute phone call? a. 200-20c b.100c+70 c. 30+7c d.100-7c e. 100-70c please answer and explain

*May 30, 2014*

**math**

When a is divided by 7,the remainder is 4.When b is divided by 3,the remainder is 2.If 0<a<24 and 2<b<8, which of the following could have a remainder of 0 when divided by 8? a. a/b b. b/a c. a-b d. a+b e. ab please answer and explain

*May 30, 2014*

**math**

54. The volume of certain rectangular solid is 12x. If the dimensions of the solid are the integers x,y,and z,what is the greratest possible value of z? a. 36 b. 24 c. 12 d. 6 e. 4 please answer and explain

*May 26, 2014*

**math**

When x is divided by 3,the remainder is z.In terms of z, which of the following could be equal to x ? a. z-3 b. 3-z c. 3z d. 6+z e. 9+2z please answer and explain

*May 26, 2014*

**maths**

answer 5

*May 23, 2014*

**math**

answer a, thank you

*May 23, 2014*

**math**

Pamela owns 37.5% of the stock of a corporation and sells 2/3 of her stock at a 10% profit, What percent of this stock does she own after this transaction? a. 12.5% b. 33 1/3% c. 66 2/3% d. 72.5% e. 90% please answer and explain

*May 23, 2014*

**math**

J.C. Nichols department store reports that the average sales on Saturdays is twice that on Thursdays and the average sales on Thursdays is twice that on the other four days.What fraction of the weekly sales are made on Thursdays? a. 1/7 b. 1/5 c. 2/7 d. 1/3 e. 2/5 please ...

*May 23, 2014*

**Maths A level**

A large cylinrical tankor radius 40cm contins a liquid and at time,t the depth is h cm. There is a hole in the bottom and liuid leaks out at a rate of 32pi h to power of 0.5. Show at time t, the heighth of the liquid in the tank satisfies the diff. eqn..dh by dt=-0.02 h to ...

*May 23, 2014*

**Principles of Public Speaking: Lesson 8**

Dog

*May 12, 2014*

**math**

Four similar glass tumblers just fit into a cubical box.The area of the top of the circular cover of any one of the tumblers is 4 pi.The area of each side of the box is a. 16 b. 32 c. 32 pi d. 64 e. 64 pi please answer and explain

*May 9, 2014*

**math**

The ratio of boys to girls in a senior class is 5:3. If 9/10 of the boys may graduate and all the girls may or may not graduate, what is the maximum part of the senior class that may graduate? a. 3/5 b. 7/8 c. 15/16 d. 2/3 e. 27/50 please answer and explain

*May 9, 2014*

**math**

Given a circle A whose diameter is 2 ft.and a rectangular piece of tin B,10ft by 4 ft.Find, correct to the nearest square foot, the tin that will be left after the greatest possible number of circles of the size of A have been cut from B. a. zero b. 1 sq.ft c. 2 sq.ft d. 9 sq....

*May 9, 2014*

**math**

what is heron's formula I am grade 7

*May 9, 2014*

**math**

In triangle ABC, AB=2 square root 2, BC=8,angle ABC=45 degrees.Find area ABC. a. 4 square 2 b. 8 c. 8 square 2 d. 16 e. 16 square 2 please answer and explain

*May 9, 2014*

**math**

oh , because two side right

*May 9, 2014*

**math**

why + 4 ? 15+4 x 30+4 19 X 34 ?

*May 9, 2014*

**math**

I don't understant,why 15 inch x 30 inch is surrouded by a mat 2 inch wide. 15+2 x 30+2 = 17 x 32

*May 9, 2014*

**math**

A picture 15 inch x 30 inch is surrounded by a mat 2 inch wide.The aea of the mat in swuare inches is a. 60 b. 94 c. 124 d. 128 e. 196 I know the answer is e, but i don't know how to do it, anyone can tell me how to do it, thank you

*May 9, 2014*

**math**

A cow is attached to a rope 10 feet long in a pasture bordered by two fence( more than 10 feet long) meeting at an angle of 60 degree. What is the area of the space in which the cow is grazing? a. 20 pi b. 5 pi /3 c. 20 pi /3 d. 50 pi /3 e. 100 pi please answer and explain

*May 9, 2014*

**math**

why 18x26 frame 1" is not 17 x 25 ?

*May 8, 2014*

**math**

A picture 16" x 24" has a frame 1" wide.Approximately how many times greater than the area of the frame is the area of the picture? a. 5 b. 45 c. 48 d. 80 e. 84 please answer and explain

*May 8, 2014*

**math**

Abe can mow the lawn in 15 minutes.Ben can mow the lawn in 20 minutes.Carl can mow the lawn in 30 minutes.They work together for 5 minutes.What part of the lawn was mowed? a. 1/4 b. 2/3 c. 3/4 d. 4/5 e. all of it please answer and explain

*May 8, 2014*

**math**

A metal cube with an edge of one foot is melted into a rectangular solid one-eighth of a foot in height. What is the area of the top of the new solid? a. 1/64 sq.ft b. 1/8 sq.ft c. 1/4 sq.ft d. 4 sq.ft e. 8 sq.ft please answer and explain

*May 4, 2014*

**MATH**

Abe can mow the lawn in 15 minutes. Ben can mow the lawn in 20 minutes.Carl can mow the lawn in 30 minutes.They work together for 5 minutes.What part of the lawn was mowed? a. 1/4 b. 2/3 c. 3/4 d. 4/5 e. all of it please answer and explain

*May 4, 2014*

**math**

SO, THE ANSWER IS A, 0.875=0.88 RIGHT

*May 4, 2014*

**math**

The distance between two points is correctly expressed as 720 statute miles or 630 nautical miles. Which of the following most closely approximates the value of one statute mile in terms of nautical miles? a. 0.88 b. 0.89 c. 0.90 d. 1.14 e. 1.25 please answer and explain what ...

*May 4, 2014*

**math**

I still not get it

*May 4, 2014*

**math**

Four similar glass tumblers just fit into a cubical box.The area of the top of the circular cover of any one of the tumblers is 4 pi.The area of each side of the box is a. 16 b. 32 c. 32 pi d. 64 e. 64 pi please answer and explain

*May 4, 2014*