915 Answered Questions for the topic Pre-Calculus

03/10/21

#### 9.5.89: The total sales of a company (in millions of dollars) t months from now are given by S(t)=0.04t^3+0.8t^2+8t+7.

The total sales of a company (in millions of dollars) t months from now are given by S(t)=0.04t^3+0.8t^2+8t+7. (A) Find S′(t).(B) Find S(6) and S′(6) (to two decimal places).(C) Interpret...
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03/10/21

#### Find the profit function if cost and revenue are given by C(x)=128+2.4x and R(x)=8x−0.03x^2

Find the profit function if cost and revenue are given by C(x)=128+2.4x and R(x)=8x−0.03x^2The profit function is P(x)= ________

03/10/21

#### Find the marginal revenue function.

Find the marginal revenue function.R(x)=x(17−0.05x)R′(x)= _________

03/10/21

#### 9.7.11 Find the marginal cost function

Find the marginal cost function.C(x)=210+3.3x−0.07xC′(x) = ____________

Pre Calculus Calculus

03/07/21

#### LAW OF SINES AND COSINES

The sailing club leaves the marina on a heading N15oE and sails for 18 miles. They then change course, and after traveling for 12 miles on a heading N35oE, they experience engine trouble and radio...
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03/07/21

#### A Ferris wheel is....

A Ferris wheel is 15 meters in diameter and boarded from a platform that is 5 meters above the ground. The six o'clock position on the Ferris wheel is level with the loading platform. The wheel...
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Pre Calculus Algebra 2

03/04/21

#### Find a polynomial f(x) of degree 3 with real coefficients and the following zeros: 4 , 2-i

02/24/21

#### Find the exact values of the other 5 trig functions if cos θ = -1/3, pi/2 < θ < pi

Find the exact values of the other 5 trig functions if cos θ = -1/3, pi/2 < θ < pi

Pre Calculus Precalculus

02/20/21

#### MATH HELP PLZ!!!

A sparkling-water distributor wants to make up 200 gal of sparkling water to sell for $5.00 per gallon. She wishes to mix three grades of water selling for $8.00, $3.00, and $4.50 per gallon,...
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Pre Calculus Precalculus

02/20/21

#### MATH HELP PLZ!!!

A rug cleaning company sells three models. EZ model weighs 10 pounds, packed in a 10-cubic-foot box. Mini model weighs 20 pounds, packed in an 8-cubic-foot box. Hefty model weighs 60 pounds,...
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Pre Calculus Precalculus

02/19/21

#### The following augmented matrix is in row-echelon form and represents a linear system. Solve the system by using back-substitution, if possible.

[1 2| 5][0 1| -1]

Pre Calculus Pre Calculus

02/11/21

#### Find f ∘ g and g ∘ f. f(x) = x3, g(x) = x2/3

(a) f∘ g =(b) g ∘ f=Find the domain of each function and each composite function. (Enter your answers using interval notation.)domain of f =domain of g =domain of f ∘ g =domain of g ∘ f =

Pre Calculus Algebra

02/07/21

#### Find the equation of a tangent line to the given curve at an x-coordinate.

I need to find the slope-intercept form of the tangent line that is formed when the curve of the equation y=x^3-2x-2 intersects with x=1

02/04/21

#### If f(x)=3x^2+4x+5, what must the value of k equal so that the graph of f(x-k) will be symmetric to the y-axis?

Choices:(a) -4(b) -4/3(c) -2/3(d) 2/3(e) 4/3

02/02/21

#### Help me plz!!!!

The half-life of a radioactive substance is 31.7 years.(a) Find the exponential decay model for this substance(b) How long will it take a sample of 400 grams to decay to 300 grams?(c) How much of...
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02/02/21

#### Plz help!!!!!!!

The amount of carbon 14 present in a paint after t years is given by A(t)=A0 e-0.00012t. The paint contains 32% of its carbon 14. Estimate the age of the paint. Round to the nearest year as needed.

02/02/21

#### Help plz!!!!!!!

The amount of carbon-14 present in animal bones after t years is given by A(t)=A0e-0.00012t. A sample of fossil had 26% of the carbon 14 of a contemporary living sample. Estimate the age of the...
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01/29/21

#### I need help with integrals

Let f be the function given by f(x)=sin^2(x/4)e^(−x2). It is known that (top value= π/2)∫(bottom value=0) f(x) dx= 0.0223. If a midpoint Riemann sum with two intervals of equal length is used to...
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Pre Calculus

01/17/21

#### Rewrite with only sin x and cos x. cos x - sin 2x

These are the choices2 sin x cos2x + cos x2 sin x cos2x + sin3xsin x cos2x - sin3x + cos3xcos x - 2sin xcos x

01/13/21

#### Is it possible to have a rational function with the following characteristics?

horizontal asymptote at y=1/3vertical asymptote at x=-4/3x intercept= (-1,0)y intercept= (0,3/4)hole at (1/2,3/11)

Pre Calculus

01/13/21

#### How do you do this pre-calculus question?

Find two function f and g such that f(g(x))=5/(x^2 −1)^3.

01/11/21

#### Write the standard form equation of the hyperbola given the following vertices and perimeter of central rectangle

Vertices (0,-1), (-20, -1)Perimeter of Central Rectangle = 72

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