2,195 Answered Questions for the topic Pre Calculus

11/10/19

Precalc question
Steve likes to entertain friends at parties with “wire tricks.” Suppose he takes a piece of wire 60 inches long and cuts it into two pieces. Steve takes the first piece of wire and bends it into... more
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11/10/19

Precalc question
You have $6000 with which to build a rectangular enclosure with fencing. The fencing material costs $20 per meter. You also want to have two parititions across the width of the enclosure, so that... more
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11/10/19

Precalc question
Jun has 300 meters of fencing to make a rectangular enclosure. She also wants to use some fencing to split the enclosure into two parts with a fence parallel to two of the sides. What dimensions... more
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11/10/19

Precalc question
A Norman window is a rectangle with a semicircle on top. Suppose that the perimeter of a particular Norman window is to be 24 feet. What should its dimensions be in order to maximize the area of... more
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11/10/19

Precalc question
Rosalie is organizing a circus performance to raise money for a charity. She is trying to decide how much to charge for tickets. From past experience, she knows that the number of people who will... more
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11/10/19

Precalculus question
Sylvia has an apple orchard. One season, her 100 trees yielded 140 apples per tree. She wants to increase her production by adding more trees to the orchard. However, she knows that for every 10... more
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11/10/19

Precalculus question
The initial price of buzz.com stock is $10 per share. After 20 days the stock price is $20 per share and after 40 days the price is $25 per share. Assume that while the price of the stock is not... more
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Pre Calculus Math Precalculus

11/07/19

Find the equation of the circle that is tangent to equation y=(-2) that has a center at (-6, 12)
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Pre Calculus

11/07/19

Need help on this problem
If the rate of alcohol in your bloodstream decreases continuously by 50% every hour, and you find that by 10 PM you have a blood alcohol level of .15 (called your BAC):    a.  Find a continuous... more
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11/07/19

Find the equation of the circle that is tangent to the line x=8 that has a center at (-5, 10)
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11/05/19

Precalc question
If the graph of the quadratic function f(x) = x^2 + dx + 3d has its vertex on the x-axis, what are the possible values of d? What if f(x) = x^2+3dx−d^2+1
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Pre Calculus Elementary Math Algebra

11/03/19

Probability with marbles
Container A has 3 blue marbles and 2 purple marbles and Container B has 1 purple marble and 3 green marbles and 1 blue marble. An experiment consists of randomly selecting a marble from Container... more
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11/03/19

Standard deviation/probability

Peter and Sally each shoot 12 arrows at a target that is circular with a diameter of 72 inches. the mean of the distances that Peter's arrows strike from the center of the target is 20 inches, and... more
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Pre Calculus Math Precalculus Sat Math

10/31/19

Write an equation for each parabola
(a)vertex (2,-1)focus (2,-5)(b)focus (3,5)directrix x=0
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Pre Calculus Math Precalculus Sat Math

10/31/19

I don't even know where to start
A bridge with a supporting parabolic arch spans 60 feet with a 30-ft wide road passing underneath the bridge. In order to have a minimum clearance of 16 feet at either edge of the roadway, what is... more
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10/30/19

Express the area of the shaded region below as a function of x. The dimensions in the figure are centimeters.
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Pre Calculus Math Precalculus Sat Math

10/30/19

In a mixture of potting soil, the ratio of peat moss to compost is 3:5. How much of each is in a 12 pound bag of potting soil?
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Pre Calculus Math Precalculus Psat

10/30/19

If a is 63 percent of x and c is 3/8 of x, then the ratio of a to c is ? (round to 0.001)
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Pre Calculus

10/30/19

Please help!!!!
Flying against the wind, an airplane travels 7680 kilometers in 8 hours. Flying with the wind, the same plane travels 5360 kilometers in 4 hours. What is the rate of the plane in still air and what... more
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Pre Calculus Math Precalculus Psat

10/29/19

I don't understand how to solve these, can you help?
Verify each identity(a) tanΘ + secΘ = cos Θ/1-sinΘ(b)tan2Θ - sin2Θ = sin2Θ tan2Θ
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10/29/19

I don't understand how to solve this precalculus problem
If 4x + 2y = 24 and 7y/2x = 7, what is the value of x + y?
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10/29/19

I have a precalculus problem
A baseball diamond is a square with sides of length 90 ft. Assume Edgar hits a home run and races around the bases (counterclockwise) at a speed of 18 ft/sec. Express the distance between Edgar and... more
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Pre Calculus Math Precalculus Functions

10/27/19

I need help with this Precalculus problem
Write a polynomial function of least degree with integral coefficients that has the given zeros-25/4 -5/3
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Pre Calculus Math Precalculus

10/27/19

Pre calc help me
A swimming pool is 8 feet longer than it is wide. The pool is surrounded by a walkway of width 4 feet. The combined area of the pool and walkway is 1280 square feet. Find the dimensions of the pool... more
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Pre Calculus Math Precalculus

10/27/19

Precalculus problem
The height of a cylinder is two times the diameter. Write the volume of the cylinder as a function of its radius.
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