# Posts by tony

Total # Posts: 966

**cal**

Decide if the given value of x is a critical number for f, and if so, decide whether the point for x on f is a relative minimum, relative maximum, or neither. f(x)= 2x^3-3x^2-12x+18; x=2 the ans. is "Critical number, minimum at (2,-2) but don't know how?

**cal**

Find f"(x) for the function. f(x)= 2x^3/2-6x^1/2

**cal**

Use the differential to approximate the quantity to four decimal places. √(122)

**cal**

Where did you made error on the first one? did you typed wrong numbers or problem.

**cal**

Find dy for the given values of x and Δx. y=4/x^4+3√x; x=4, Δx=.5

**cal**

Perfect!!!

**cal**

Find the average value of the function on the given interval. f(x)= √x+2; [1,7]

**cal**

I'm lost here. I think i'm adding wrong numbers or something else here.

**cal**

Approximate the area under the curve and above the x-axis using n rectangles. Let the height of each rectangle be given by the value of the function at the right side of the rectangle. f(x)=3/x from x=2 to x=6; n=4

**cal**

Evaluate dy/dt for the function at the point. y√x+1 = 12; dx/dt = 8, x=15, y=3

**9th Grade Math**

How to write 0.023494751 and 0.040381247 as a percent rounded to one decimal? Would it be 2.3% and 4.0%?

**9th Grade Math**

How to change 84.9% and 88.1% to a decimal? Would it be 0.849 and 0.881?

**us history**

Leading the underground railroad in to further North to Canada, was due to the Fugitive Slave Act. is it true.

**Pipeline design**

Sketch a preliminary layout for the following heat exchanger systems. On the layout sketch indicate pipe work manifolds, access platforms, access for construction, operations and maintenance. In your answer we are looking for thought into the relative sizes of these heat ...

**cal**

A conical tank (with vertex down) is 12 feet across the top and 18 feet deep. If water is flowing into the tank at a rate of 18 cubic feet per minute, find the rate of change of the depth of the water when the water is 10 feet deep. I got 81/200pi ft/min.

**US History Mrs. Sue**

Select the group that best embraced the beliefs of Abraham Lincoln. Abolitionists or The Free Soil Party. Is it Abolitionists.

**math**

A box of chalk and 2 staplers cost $10. Three boxes of chalk and 2 staplers cost $18. Find the total cost of 1 box of chalk and 1 stapler.

**physics**

suppose the diver vaults off the springboard, leaving it with an initial speed of 3.50 m/s upward. use energy conservation to find his spped when he strikes the water.

**math**

I need help on study links 2.9 for 5 grade

**science**

light has what range of wavelength

**Calculus**

so answer would be none or nowhere.

**Calculus**

g(x)= {0 if x<0 {x^3-3x if 0≤x≤3 {3 if x>3 If it was like this one. Then what? Same

**Calculus**

g(x)= {0 if x<0 {x^2-2x if 0≤x≤2 {2 if x>2 Find all values x=a where the function is discontinuous. Is the answer 0 and 2 or just 2?

**Calculus**

So not continuous at x=-8 and function is not defined right.

**Calculus**

f(x)= |x−8| / x+8 Is the function is not continuous at x= -8,8 or just at -8.

**Calculus**

So the function is defined or not defined.

**Calculus**

f(x)= ⎨x^2-1 / x+1, for x not = -1 ⎨8, for x=-1 I'm trying to graph and determine the values of x for which the function is continuous. Does the graph looks like a u shape opening up or a line.

**Lubrication**

A pump fitted with 50mm bore ball bearings uses an oil whose viscosity ranges from 100cSt at cold pump start-up to 7.5Cst when running at maximum speed and load. If these viscosities are the safe limits for the oil, specify the maximum start-up speed and the maximum running ...

**Calculus**

Find the limit. lim x→1 x^4-5x^3+7x^2-6x+3 / x-1

**Calculus**

Also suppose If lim x→6 had been lim x→5 would that had been changed the answer. Or it would be same.

**Calculus**

My fault. Sorry about that. Thank you

**Calculus**

4^9 = 262144 Is this the answer!! I got 3.

**Calculus**

Give an appropriate answer. Let lim x→6 f(x)=81. Find lim x→6 4^√f(x).

**Mechanics**

In a direct acting pressure relief valve, 64 bar pressure is acting on the conical dart seating area and the dart is kept closed by a spring force of 50 kg opposing the pressure. (5) a) Determine the bore diameter on the seat. b) What will the spring force be if a pressure of ...

**Algebra**

center is (-4,3)

**Algebra**

Find center, vertices, foci. (x+4)^2/36 + (y-3)^2/100 =1

**Business Statistics**

a sample of 16 people reveals the mean consumption to be 60 gallons with the standard of deviation of 20 gallons

**trig**

Given that P=(-1,8) and Q=(-2,1), find the component form and magnitude of the vector 3 PQ.

**business math**

If you can earn 5%, how much will you have to save each year if you want to retire in 35 years with $1 million?

**trig**

tan(7π/4) + tan(5π/4) Does this = 0

**trig**

Simplify: csc^2 x sec x / sec^2 x + csc^2 x

**Algebra**

Determine whether the equation defines y as a function of x. y=-17

**trig**

tan (pi/2 - x) = sin (pi/2 - x) / cos (pi/2 - x) But sin (pi/2 - x) = cos x and cos (pi/2 - x) = sin x <=> tan (pi/2 - x) = cos x / sin x = cotan x <=> tan (pi/2 - x) * tan x = cotan x * tan x = (cos x / sin x) * (sin x / cos x) = 1

**trig**

simplify the expression. tan(π/2-x)tanx

**trig**

simplify the expression. cos^2x+sin^2x/cot^2x-csc^2x

**trig**

But my teacher gave the answer on the review as -1.

**trig**

simplify the expression. -sin^2x-cos^2x

**trig**

use basic identities to simplify the expression. csc θ cot θ / sec θ

**Algebra**

Determine whether the equation defines y as a function of x. y= -16

**statistics**

Investment analysts generally believe the interest rate on bonds is inversely related to the prime interest rate for loans; that is bonds perform well when lending rates are down and perform poorly when interest rates are up. Can the bond rate be predicted by the prime ...

**statistics**

Suppose a researcher gathered survey data from 19 employees and asked the employees to rate their job satisfaction on a scale from 0 to 100 (with 100 being perfectly satisfied). Suppose the following data represent the results of this survey. Assume that relationship with ...

**statistics**

Y=71745-678.964x =6495.786 So for 2012, y (8) = -972.77

**statistics**

Shown below are rental and leasing revenue figures for office machinery and equipment in the United States over a sever-year period according to the U.S. Census Bureau. Use these data to run a linear regression and then forecast the rental and leasing revenue for the year 2012...

**physics**

elena wtf are ypu smoking

**Chemistry**

-483kJ =-484kJ-[1.0atm[-5.60L]] =-484kJ-[5.60Latm[101j/Latm]] =-484kJ+565.5J =-483kJ

**college algebra: probability and statistics**

50%

**pre cal**

x^2(4x^2+1)^7(76x^2+3)

**Maths**

what is the max value of y=x^22/10x^logx

**trig**

Write the complex number in trigonometric form, using degree measure for the argument. -12 - 16i

**trig**

Convert the rectangular coordinates to polar coordinates, using radian measure for the angle. (6, -6) 6√(2),7π/4 OR -6√(2),5π/4

**trig**

Solve the equation. Express your answer in trigonometric form. x^5 - 11 = 0

**trig**

Find the indicated roots. Write the answer in trigonometric form. Fourth roots of 256(cos 220° + i sin 220°)

**trig**

Use De Moivre's theorem to simplify the expression. Write the answer in a + bi form. [2(cos 240° + i sin 240°)]^5

**trig**

Find the dot product a*b. a= (5,-9), b=(4,-3)

**trig**

estimate the components of the vector. Round to one decimal place. [v] = 33.9, θ = 65.9° Find the horizontal and vertical components of v, and write in component form.

**trig**

find the indicated vector. let u = (-9,1), v=(-5,9). Find 3u+v

**trig**

Find z1z2 and z1/z2 for the pair of complex numbers using trigonometric form. z1=4+9i, z2=-5-5i I got z1z2 = 25-65i But cannot find the z1/z2.

**FND 154 Fundamentals of Accounting**

Show a journal entry for the Harwick Company that April 5, merchandise was purchased from Botharn Company for $23,000, terms 2/10, net/30,FOB shipping point

**trig**

slove the equation exactly over the interval [0, 2pi) sinx=1-2sin^2x

**trig**

use an identity to write the expression as a single trignometric function. squ root 1-cos48°/2

**trig**

choose the expression that is equivalent to the given expression. 2 cos^2 4x-1

**trig**

Use the fundamental identities to simplify the expression. cos^2θ/sin^2θ+cscθsinθ I got tan^2theta

**trig**

i got it now. thanks

**trig**

so the answer is 330

**trig**

fidn all values of tehta in [0, 360) that satisfy the equation. √(3)tan(θ/2)=-1 I have four choices 300, 330, 150 , 120 and i got 120

**trig**

Multiply and simplify. (cos x - sin x)^2

**trig**

Choose the expression that is equivalent to the given expression. sin 6x tan 3x I got 2 sin^2 3x

**trig**

Write the expression as the sine, cosine, or tangent of a double angle. Then find the exact value of the expression. 2tan 2pi/3 / 1-tan^2 2pu/3

**trig**

Solve the right triangle with the given sides and angles. a = 3.0, B = 31.0°

**math**

2. The sales tax rate applied to all purchases within a state was 0.04 (4 percent) throughout 2006 but increased to 0.05 (5 percent) during all of 2007. The state government collected all taxes due, but its tax revenues were equal to $40 million each year. What happened to ...

**math**

Market price with no tax is where supply equals demand, so at $7. b) The two dollar tax is reflected in the price that people have topay, but it does not give a firm extra income. For instance, pricewas $7 in part a. Now with the tax, people pay $9, but the firmonly earns $7. ...

**Physics**

Calculate the change in potential energy of a 86.9 kg man when he takes an elevator from the first floor to 15th floor, if the distance between floors is 4.47 m. *This building has a thirteenth floor! Keep in mind that he stands on the floor of the top floor, not its ceiling!

**Calculus**

An arithmetic progression has terms a8 =23 and a20 =83 . What is the value of the term a12

**trig**

Find all values of ¸ in [0°, 360°) that satisfy the equation. 2 sin 2θ - √(3) = 0

**trig**

Find all real numbers in [0, 2π) that satisfy the equation. cos 2x = √(2)/2

**trig**

Find all angles in degrees that satisfy the equation. Round approximate answers to the nearest tenth of a degree. tan α = -1.85

**trig**

Use a sum or difference identity to find the exact value. tan 25deg + tan 5deg / 1-tan 25deg tan 5deg

**trig**

Find cos(A+B). cos A=1/3 and sin B=-1/2, with A in quadrant I and B in quadrant IV.

**Trigonometry**

In a triangle ABC, if 2sinB=sinA+sinC and sides a+c=70, what is side b?

**trig**

for the given angle, name the quadrant in whihc the terminal side lies. -350deg

**trig**

identify the quadrant in which 0 lies. sin < 0 and sec > 0

**trig**

determine the period of the function. y = cot 4t

**trig**

Identify the quadrant in which θ lies. sin > 0 and tan < 0

**trig**

Find the trigonometric function value of angle θ. Cos θ = 2/7 and θ is in quadrant IV. Find sin θ.

**trig**

The point (-3, 4) is on the terminal side of angle θ in standard position. Find cot θ.

**trig**

Given that θ is an angle in standard position whose terminal side contains the given point, provide the exact value of the indicated function. (-2, -3) Find sec θ.

**Polynomials**

The polynomial P(x)=ax^3+bx^2+cx+d leaves a remainder of 10x+11 when it is divided by x^2−1. It leaves a remainder of −6 when it is divided by x^2+x+1. What is the value of bc−ad

**Complex numbers**

If f(x) is a polynomial with real coefficients such that f(4+3i)=31+16i, then f(4−3i)=a+bi. What is the value of a+b

**Maths**

thank you very much

**Maths**

A and B are real numbers such that the two quadratic equations 19x^2+3x+2=0 and Ax^2+Bx+7=0 have a common root. What is the value of A+B