141 Answered Questions for the topic Precalc

12/02/19

#### Precalculus Word Problem - 3 by 3 or 2 by 3 function

A total of $5000 is invested at 2%, 3% and 4%. The amount invested at 4% equals the total amount invested at 2% and 3%. The total interest for one years is $145. If possible, find the amount...
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10/30/19

#### Finding exponential decay given half-life problem

The half-life of a certain radioactive substance is 10 years. Initially there are 100 grams of the substance. Let A(t) be the number of grams of the substance at time t years. Find each of the...
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10/30/19

#### Continuous compound problem

How long will it take for an investment of $1000.00 to grow to $6000.00 at an interest rate of 3% if interest is compounded a) 3 times per yearb) Continuously

10/09/19

#### Given some zeros of a polynomial function find all zeros of the function

P(x) = 2x^4 - x^3 - 27x^2 + 16x - 80, with zeros: 4, -4

#### Math Review Help

The pilot of a hot-air ballon would like to know the angle of depression to a landing spot that is 125 meters away. If the pilot's altitude is 125m, what is the measure of the angle of depression...
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#### Math Review Help

A skateboard ramp will have a height of 12 in. and the angle formed between the ramp and the ground is 30 degrees. To the nearest inch, what will be the length L, of the ramp?

08/28/19

#### Determine whether f(x)=5x+1/x and g(x)= x/5x+1 are inverse functions

Determine whether f(x)=5x+1/x and g(x)= x/5x+1 are inverse functions. Explain how you know.

04/07/19

#### How do you convert a shifted parametric circle equation to rectangular form?

x=-2cos((1/2)t-(π/2))+23y=2sin((1/2)t-(π/2))+6specifically, how do you separate the stuff inside the cos/sin parenthesis to eliminate a parameter? I find all kinds of solved simple circle...
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Precalc Precalculus

03/20/19

#### What angle in radians corresponds to 3.83 rotations around the unit circle?

Precalc

10/30/18

#### the equation of the tangent line to th curve at the point x=3

equation is 4/(x-1) i got the derivative as -4x/(x-1)^2

09/18/18

#### What is the height function?

The height s above the ground at time t of a falling object is given by s(t) = −5t2 + v0t + s0 where s is in meters, t is in seconds, v0 is the object's initial velocity in meters per second and s0...
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Precalc Precalculus

04/02/18

#### Precalc question - please help! What's wrong with this answer?

The question is:
A student was given the problem: "Solve x2 > 4" The student wrote the following response:
STEP 1: x2 > 4
STEP 2: √x2 > ±√4
STEP 3: x > ± 2STEP 4: So, the...
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03/15/18

#### Find a function that models the surface area of a cube in terms of it's volume.

I'm really struggling with this problem:
Find a function that models the surface area of a cube in terms of it's volume.
I got that V = x3 and S = 6x2 but I can't figure out how to write...
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02/23/18

#### Precalc problem- finding all real solutions

Can someone help me find the solutions of this equation? I tried a few times but I can't seem to get the right answer.
1 + 2x = 2 + 4 (x + 7)(x + 6) x+7 x+6...
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02/23/18

#### Precalc problem- finding all real solutions

Can someone help me solve this precalc problem? I'd really appreciate it!
Find all real solutions of the equation. (Enter your answers as a comma-separated list. If there is no real solution,...
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02/23/18

#### Precalculus Math Problem - Finding all real solutions

Can someone help me solve for this? I tried a couple of times and can't seem to get the right answer. Thank you for any help!
Find all real solutions of the equation. (Enter your answers as a...
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02/23/18

#### Precalculus Math Problem

I'm not sure how to approach this problem and I'd really appreciate any help!If a ball is thrown directly upward with a velocity of 36 ft/s, its height (in feet) after t seconds is given by y = 36t...
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11/05/17

#### How do I solve this problem?

im having trouble on my Precalc homework. This is the problem: “a box is formed by removing squares of side length x inches from each corner of a rectangular piece of cardboard 10 inches wide by 16...
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Precalc

10/10/17

#### Define a function h that determines the area of the picture and frame in terms of the width of the picture, w

Tucker is using a one-inch frame for a picture where the length of the picture, l, is 2 inches less than the width of the picture, w

Precalc

09/10/17

#### A square plot of land has a building 70 ft long and 60 ft wide at one corner.

The rest of the land outside the building forms a parking lot. If the parking lot has area 12,700 ft2, what are the dimensions of the entire plot of land?

Precalc

08/08/17

#### The monthly average high temperature, y, in degrees Fahrenheit at Phoenix, Arizona, can be modeled by y = 20.3sin(0.53x−2.18) + 83.8 where x = 1 corresponds to

The monthly average high temperature, y, in degrees Fahrenheit at Phoenix, Arizona, can be modeled by y = 20.3sin(0.53x−2.18) + 83.8 where x = 1 corresponds to January, x = 2 corresponds to...
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07/29/17

#### find the sum 8+6+4+(8/3)+...

Is this even possible? I cannot find a correlation from a1 to a2 to a3.... so on. It's not Arithmetic or Geometric

Precalc Precalculus

05/09/17

#### What is the remainder when x^4-2x^3+x+5 divided by x+1?

What is the remainder when x^4-2x^3+x+5 divided by x+1?

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