448 Answered Questions for the topic Precalculus Homework

02/17/17

02/17/17

02/17/17

#### Determine the domain of the function? f(x) = sqrt(−x2+13x−40)

I tried solving this one (I'm trying to only ask questions on here that i've tried solving lol), however, I keep getting the domain of (-infinity, infinity). However, my teacher said that that... more

02/17/17

#### Farmer Brown has 300 yards of fencing with which to build a rectangular corral. He wants to divide it evenly into three pens, so he adds in two divider fences.

a) Write the area of the corral as function of x, so A(x)=?   b) Determine the maximum area enclosed by the corral. (Decimal approximations are marked incorrect.) So the maximum area equals how... more

02/17/17

#### Determine the inverse function of f ○ g(x). f (x) = 2 x + 9 and g (x) = −9 x + 8

The inverse in this question is a function of y. What would "(f ○ g)−1(y) =" equal. I got the answer (-x+25)/18 (or 25/18-x/18). However, this answer is wrong. Should I just sub out the x to a y so... more

02/17/17

#### The function f(x) = 7x^2 − 4x + 9 is not invertible, however, the domain can be restricted so that the function is invertible only on the restricted domain.

There are many ways to do this. One way is to only use the set of positive, real numbers of the form [a,∞). Determine a value of a so that it is the smallest possible, positive real number where... more

02/17/17

#### A parabola has a vertex at (2,4). The y-coordinate of the parabola at x=3 is 18/6 . Determine the x-intercepts of the parabola. Enter your answer in exact form

I need to find what the smaller and larger x intercepts are, but I'm not sure how to do that (and it's a homework question with a topic that hasn't yet been covered in class)

02/14/17

#### PRECALCULUS HELP: inverse of a equation

The functionf(x) = −12 x^2 + 6x + 5is not invertible, however the domain can be restricted so that the function is invertible only on the restricted domain. There are many ways to do this. One way... more

01/30/17

#### a person on the top of a 160-foot building throws a baseball vertically upward. The quadratic function, s(t)= -16t^2 +64t +160.

a person standing close to the edge on the top of a 160-foot building throws a baseball vertically upward. The quadratic function, s(t)= -16t^2 +64t +160, models the ball's height where s(t) is the... more

01/30/17

The Mayor of Hotlanta is told that zombies are spreading out from the center of a field in the city. The Mayor quickly puts out a signal for Capt. Brave who hovers 40 meters over the center of the... more

01/11/17

#### F (x) = x/50

Describe the relevant domain of the function

01/11/17

#### I need help with finding the answer to a circle problem

Find the distance between Memphis (35 degrees 9 minutes north latitude) and New Orleans (29 degrees 57 minutes north latitude). Assume that the radius of the Earth is 3960 miles. This is for... more

12/14/16

#### What percentage must the label's profit increase by to be worth 100 million dollars in 2 years?

Suppose a record company with an operating profit of 76.95 million dollars wants to increase it's profit to 100 million dollars in two years.   A Step-by-Step procedure would be very much... more

12/06/16

#### A farmer has 1200 yards of fencing to enclose a rectangular garden. Express the area A of the rectangle as a function of the width x of the rectangle.

This is an application problem that requires me to create a function based on given and prior information.

11/19/16

#### what is the distance from Philadelphia to Lancaster

The bearings from lancaster to Reading is N 46 degrees E. The bearing from Reading to Philadelphia is S 44 degrees E. The bearing from philadelphia to lancaster to Lancaster S 83 degrees W. If the... more

11/07/16

#### put y=x^-2x-3 into vertex form

convert y=x^-2x-3 into vertex and intercept form

11/05/16

#### the optimal reception

A Dish TV satellite dish is the shape of a paraboloid. The dish is 36 inches wide, and 8 inches deep. How many inches should the receiver be located from the vertex for optimal reception? (round to... more

11/03/16

10/22/16

#### In your own words, explain why the method of dividing complex numbers works. What property justifies this process?

In your own words, explain why the method of dividing complex numbers works. What property justifies this process?

10/17/16

1/2x-4=3/4

10/10/16

#### Find the radian measure of the central angle of a circle of radius r that intercepts an arc of length s. 1) r = 2 inches, s = 20 inches

Find the radian measure of the central angle of a circle of radius r that intercepts an arc of length s.  r = 2 inches, s = 20 inches

10/02/16

#### explain how the graph of y=4(cube root of (x+2))-5 can be obtained by transforming the graph of y=cube root of x

Need help explaining how to do this, I am not understanding how exactly the transformation can be explained

09/27/16

#### elevation to the crossbar 24 degrees.forward 6 yards closer and AOE is 38 degrees. How far is nick from the goal posts and how high is the crossbar?

Nick is standing on the football field looking at the goal posts, getting ready to kick a field goal. He measures the angle of elevation to the crossbar and gets 24 degrees. He then moves straight... more

09/09/16

#### Find all points on the x-axis that are a distance 8 from P(5, -7)

smaller x value and larger x value

09/06/16

#### Stone thrown vertically up at a velocity of 36ft per sec from a bridge 61ft above level water.

H=-16t"2"+36t+61   A)Draw a picture B)Find the time when the stone is again 61 feet above the water.  C) find the time when the stone strikes the water. (Show answer reduced to lowest term,... more

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