# 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

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

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