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141 Answered Questions for the topic Precalc

Precalc

04/17/17

Prove trig identity.

cos(2x)+sin^2 x = 1/2 sin(2x) cot x.

02/27/17

I'm having trouble with several questions listed below:

1. Find the exact value of cos(t/2) if sin(t) = -7/25 and pi < t < 3pi/2    2. Find all the solutions in the interval [0,360]        cos(2x)= - sqrt3/2   

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
Precalc

12/08/16

Solve the problem- precalc

A. $20000.  B.$61000.  C. $18000.  D. $41000   A 122000 trust is to be invested in bonds paying 7%, CDs paying 5%, and mortgages paying 9%. The bonds and cds investment must equal the mortgage... more
Precalc Math Precalculus

08/06/16

Determine all non permissible values

Determine all the non-permissible values of    f(x)= (x^2-1)/(x^2-x-6)
Precalc Math Precalculus

07/24/16

Find x in the equations

 f(x)=lx-1l     g(x)=-lx+1l+4
Precalc Math Precalculus

07/24/16

Look for the intersections of the functions

f(x)=2x^2-3x+1   g(x)=-x^2+2x+3   Give your answers as coordinates (a,b)

06/20/16

if the radius of the circle in the figure is 20 cm and length equals 85 cm, what is the radian measure of angle

If the radius of the circle in the figure is 20 cm and length equals 85 cm, what is the radian measure of angle?
Precalc

03/20/16

An egg salesman has 5 dozen eggs that he will sell for $1.00 per dozen. Before they can be sold, they must pass an inspection.

An egg salesman has 5 dozen eggs that he will sell for $1.00 per dozen. Before they can be sold, they must pass an inspection. Three eggs are selected at random. If all three are good, the... more

Exponential Growth Problem Involving bacteria population??! PLEASE HELP!!! - Precalculus

I am really stuck on this question, particularly questions 3 and 4. Could you please show how you get the answers to those questions and explain? I have been stuck on those for a while and would... more

The count in a bateria culture was 100 after 15 minutes and 1800 after 30 minutes.? Find the population in 95 minutes? EXPONENTIAL GROWTH PROBLEM!? PLEASE HELP

The count in a bateria culture was 100 after 15 minutes and 1800 after 30 minutes. 1. What was the initial size of the culture? Round your answer to the nearest bacteria. 2. Find the doubling... more
Precalc

01/22/16

Rectangular coordinate (-2,5) is given. Find all polar coordinates that satisfy.

Need help as fast as you can. Also need tutor
Precalc

01/21/16

Elimante parameter. x=t+4, y=t^2

need help on this fast please
Precalc Math Precalculus

12/21/15

Please prove that cot A + cot B + cot C = (a^2 + b^2 + c^2)/(4(area of triangle ABC)).

I need help with this proof. Please help me. 
Precalc Math

12/21/15

Solve, can not cross multiply, need to verify so you can only change one side.

√(6)-√(2) = √(2-√(3))       4                2    
Precalc

12/01/15

pre calc question

The lengths of the sides of a triangular parcel of land are approximately 500 feet, 600 feet, and 950 feet. If land is valued at $2000 per acre (1 acre is 43,560 ft2), what is the value of the... more
Precalc

12/01/15

sin x precalc

Use a graphing device to approximate, to one decimal place, the solutions to the equation. (Enter your answers as a comma-separated list.)sin x + 17x = x3

09/14/15

find the length of the side of the square, given its 3 inches shorter than the diagonal

The side of a square is 3 inches shorter than the length of the diagonal. Find the length of the side.

09/14/15

find the lengths of the triangle and the square

the sides of an equilateral triangle are one unit more than the sides of a square. If the sum of their perimeters is equal to 107 inches, then find the lengths of the sides of both the square and... more
Precalc

09/10/15

the distance between x and -12 is at least 2

use absolute value notation to describe the situation

08/01/15

I have no idea how to find an angle when you have 2 sides of a right triangle

It is a right triangle with two unknown angles and one unknown side length. The present lengths are 8 and 11. I need to find one of the angles. Please help!

07/31/15

I found an answer to my problem but I don't think its simplified. Here it is:

cosine 48= 13/x .6691=13/x 1/13 ∗ .6691 = 13/x ∗ 1/13 .6691/13=x   Can my answer be simplified further?!? Please help me!
Precalc Precalculus

07/31/15

9x2+4=2x Solve using the quadratic formula.

9x2+4=2x Solve using the quadratic formula  PLEASE RESPOND ASAP

06/08/15

Sonic boom trig question

The US Air Force was running maneuvers with the F22 Raptor, flying low enough so that you could see the shock cone created as the jet flies overhead at supersonic speeds. You wanted to take a video... more

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