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Precalc
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Prove or disprove the following identity.
cos(-x) - sin(-x) = cos(x) + sin(x)
1 answer
asked by
George
384 views
how do you find x in 7-=log(x/10^-12)
4 answers
asked by
Rebekah
315 views
1. 1/3log base 8 of (x+1)=2log base 8 of 3-(2/3)log base 8 of (x+1)
2. 2^x+8 times 2^=x all over 2 = 3 3. if log base a of 3= x
4 answers
asked by
Rebekah
689 views
1. Solve log (4x) = log (2) + log (x-1)
the fact that this is x-1 and not + is really messing me up because i keep getting a
5 answers
asked by
Rebekah
512 views
1. If a bicycle wheel has a diameter of 27 inches, find the radian measure of the angle through which the wheel turns as the
4 answers
asked by
Rebekah
1,323 views
1. If a bicycle wheel has a diameter of 27 inches, find the radian measure of the angle through which the wheel turns as the
1 answer
asked by
Rebekah
1,054 views
A tower is supported by a guy wire 610 ft long. If the wire makes an angle of 69 degrees with respect to the ground and the
1 answer
asked by
Mickey
1,117 views
1. Prove
sin - cos +1/ sin + cos - 1 = sin +1/cos 2. 1+ sin/ 1- sin = (sec + tan)^2 Thanks!!
1 answer
asked by
Rebekah
417 views
1. Find the exact value
3sin(invertangent (-1)) I got 0. Given 0<x<orequalto 1, determine the value of inversine (x) + inversetan
1 answer
asked by
Rebekah
444 views
Write the complex number z = −6 in polar form
3 answers
asked by
Jane
455 views
Convert the complex number c=3cis 0.25 into rectangular form.
2 answers
asked by
Jane
874 views
Write the complex number z = 2 + 5i in polar form, rounding to the nearest hundredth if needed.
4 answers
asked by
Jane
1,518 views
The vectors, (2, -1) and (4, 8), are
1)parallel 2)perpendicular 3)neither parallel or perpendicular
3 answers
asked by
Jane
403 views
For #1-3, an angle of rotation and ( x prime, y prime) coordinates are given. find the (x,y) coordinates?
1. angle= 30 degress, (
1 answer
asked by
Rebekah
413 views
what is the inverse tangent of negative root3/3
2 answers
asked by
Anonymous
654 views
a weight on a vertical spring is given an initial downward velocity of 4cm/sec from a point 6 cm equilibrium. Assuming that the
2 answers
asked by
Anonymous
498 views
Prove:
sin2x*sinx/2cosx + cos^2 0 = 1
3 answers
asked by
S
461 views
solve the equation:
log base 10 of x - log base 10 of (7-4x)=2 Please help i have been stuck on this for awhile!
5 answers
asked by
Alison
441 views
A vehicle has an engine that is connected directly to a gear box. In the highest gear, a 2 inch radius gear is turning a 14 inch
1 answer
asked by
John
494 views
Solve the following equation for x in terms of ln and e.
(2e^3)-6-(16e^-x)=0
3 answers
asked by
Aly
1,073 views
Are exponential equations the same as exponential functions?
I am writing a summary of this year's Pre-Calculus lessons and one
2 answers
asked by
Lie-ma Been
1,088 views
A taxi company charges $4.00 for the first mile (or part of a mile) and 40 cents for each succeeding tenth of a mile (or part).
2 answers
asked by
Alexa
920 views
Two lookout towers are situated on mountain tops A and B, 4 mi from each other. A helicopter firefighting team is located in a
2 answers
asked by
Lily
694 views
A corpse was discovered in a motel room at midnight and uts temperature was 82°F. The temperature dropped to 80.5°F two hours
2 answers
asked by
Guillermo
578 views
I need help with logs. Thank you!
Evaluate. 1. log base(3) 25 to the cubed root Condense. 2. 1/3logx + 2logy^3 -3log(z+1)
1 answer
asked by
Heather
338 views
Water is flowing from a major broken water main at the intersection of two streets. The resulting puddle of water is circular
4 answers
asked by
Zoe Cameron
3,618 views
Find the derivative of:
f(x) = 1/(3x)^4 + 3x^4 Determine the points, if any, at which the function has a horizontal tangent line
1 answer
asked by
Heather
359 views
Find a rectangular equation for the plane curve defined by the parametric equations.
x = sin(theta) y = 3cos(theta)
3 answers
asked by
Heather
1,533 views
Can someone show me how to simply this:
(5x^3 y^-1 z^-5)^-3 (x^2 y^0 z^-6)^2
1 answer
asked by
Johni
245 views
Consider the function f(x)=2x^3 +1. Determine whether the inverse of F is a function. Find the inverse.
4 answers
asked by
Johni
1,357 views
j(x)=3/4x-1
j(?)=3 May someone please help me?
1 answer
asked by
Yani
255 views
How do you know what quadrant these two are in? I'm having a little trouble determining. Can someone check if my answers are
3 answers
asked by
Josh
649 views
C(x)={(x,y)|y=4x-5}
D(x)=x^2+2x C(D)=
1 answer
asked by
June
275 views
D(x)=x^2+2x
h(x)=7 h(D)=
4 answers
asked by
June
290 views
Identify all of the trig functions that fit each description:
1. Has a amplitude of 1 2. Is discontinuous at odd multiples of
1 answer
asked by
Anon
442 views
•You have a wire that is 71 cm long. You wish to cut it into two pieces. One piece will be bent into the shape of a right
4 answers
asked by
Bethany
2,757 views
suppose you want to invest $60,000 for ten years. You can invest your money in a CD that earns 4% interest, compounded quarterly
2 answers
asked by
Sophia
889 views
1) Janet is offered a job with a starting salary of $15,000, and a guaranteed annual increase of $600. If she takes the job,
2 answers
asked by
Ron
736 views
A certain retiree currently receives $15,000 a year in Social Security. Each year his payment is increase by 3% to keep up with
1 answer
asked by
Peyton
406 views
1) log n + log 5 = 3
2) log y = 1/3 [log40 - log5] + 2/3 log27 + log11
1 answer
asked by
Samantha
404 views
Why the polar form(2.83,45) is written a rectangular complex number like this:
2.83*cos45 + j*(2.83*sin45) I would like some
3 answers
asked by
Andrei
404 views
Suppose the difference of two numbers is 3. Does the sum of their squares have a minimum or maximum value? What is that value?
1 answer
asked by
Remy
380 views
Taxes on a house assessed at $64,000 are $1500 a year. If the assessment is raised to 85,000 and the tax rate did not change,
3 answers
asked by
Jack
749 views
let f(x)= (x / (6x-36)) and g(x)= (1/(x-6)). find all numbers x, if any, such that f(x) < g(x)
1 answer
asked by
Jillian
262 views
Using logarithms to rewrite the expression:
1.) log4.(4)^3x= 2.) 6 log6 36= 3.) 3 log 2 1/2= 4.) 1/4 log4 16
2 answers
asked by
Anonymous
843 views
Simplify completely.
e^(ln(7)+2ln(4))−log9(27/27) the log has a base of 9 and the top 27 is under a radical sign.. my computer
1 answer
asked by
Jillian
440 views
Let x and y be real numbers such that x^2 + y^2 = 1. Find the max value of 2x - 5y.
A hint was given to use Cauchy-Schwarz but
1 answer
asked by
Katie
311 views
Rhombus ABCD, with side length 6, is rolled to form a cylinder of volume 6 by taping side AB to side DC. What is sin(angle ABC)?
4 answers
asked by
katie
1,424 views
You have a wire that is 100 cm long. You wish to cut it into two pieces. One piece will be bent into the shape of a right
3 answers
asked by
Cristiano
798 views
Sales of snowmobiles are seasonal. Supposed sales in Camrose, Alberta are approximately by S=200+200cos[pi/6(t+2)], where t is
3 answers
asked by
Peech
1,362 views
My problem is this:
Three friends want to share a circular 14-inch pizza equally by exactly only two parallel cuts. How far from
2 answers
asked by
Tamara
479 views
Three zeroes of a fifth degree polynomial function are 1/3, 4 - 6i, and -2 + 11i. Determine the remaining zeroes of the
6 answers
asked by
Max
2,140 views
Use the Remainder Theorem to determine if x - 2 is a factor of the polynomial: f(x) = 3x^5 - 7x^3 - 11x^2 + 2
I am confused
2 answers
asked by
Max
778 views
point) The pressure P (in pounds per square foot), in a pipe varies over time. Four times an hour, the pressure oscillates from
3 answers
asked by
Joe
1,721 views
Find a possible formula for the trigonometric function whose values are in the following table (note the values in the table may
4 answers
asked by
Joe
3,810 views
Find an equation of a rational function that satisfies the given conditions.
Vertical asymptote: x = 4 Horizontal asymptote: y =
3 answers
asked by
Max
1,134 views
According to an article by Thomas H. McMahon in the July 1975 issue of Scientific American, a tree’s height varies directly
2 answers
asked by
Summer
655 views
Assume the annual number of skin cancer deaths increases geometrically, instead of arithmetically. Use the same starting number
2 answers
asked by
Joseph
617 views
e^(x^2-3)=e^(x-2)
please and thank
1 answer
asked by
:ards
215 views
There are 12 balloons in a bag: 3 each of blue, green, red, and yellow. Three balloons are chosen at random. Find the
9 answers
asked by
Marina
2,320 views
What happens if you try to find the zeros using the quadratic formula for k(x)=x^2 -2x+2?
1 answer
asked by
Sean
346 views
Find the continuous growth rate is Q=7000e^(0.24t)
2 answers
asked by
Barney
613 views
What are two ways to evaluate end behavior of polynomials?
1 answer
asked by
CJ
430 views
Amy and Kali are selling cookie dough for a school fundraiser. Customers can buy packages of white
chocoloate chip cookie dough
1 answer
asked by
Anonymous
435 views
find x-int of
y=x^3-x^2-6x / -3x^2-3x+18 i know i have to make y=0, but im not sure where to go from there
1 answer
asked by
Anonymous
329 views
310 degrees into radians
3 answers
asked by
Anonymous
506 views
find difference quotient
f(x) = 1/x+3
3 answers
asked by
Carl
704 views
Prove (a-x)is a factor of (x-a)^3+(x-b)^3+(x-c)^3=0
Im not too sure what to do, would appreciate help
3 answers
asked by
david
351 views
3tan (x- pi/5)-sqrt(3) =0
4 answers
asked by
Dylan
512 views
The value of a particular investment follows a pattern of exponential growth. You invested money in a money market account. The
2 answers
asked by
Nora
536 views
logb+zlogc=log( )
2 answers
asked by
Josh
488 views
Sofia invested $360 in an account in the year 2005, and the value has been growing exponentially at a constant rate. The value
3 answers
asked by
patrick
1,289 views
David invested $68,000 in an account paying an interest rate of 5.5% compounded daily. Assuming no deposits or withdrawals are
3 answers
asked by
jak
2,425 views
David invested $340 in an account paying an interest rate of 2 1/8% compounded continuously. Natalie invested $340 in an
2 answers
asked by
jak
830 views
Outside temperature over a day can be modeled as a sinusoidal function. Suppose you know the high temperature of 94 degrees
3 answers
asked by
Cynthia
607 views
This exercise uses Newton's Law of Cooling.
A kettle full of water is brought to a boil in a room with temperature 20°C. After
4 answers
asked by
EE
926 views
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