454 Answered Questions for the topic Precalculus Homework

Precalculus Homework

05/22/17

#### Find an integer such that the sum of twice the square of the integer and the integer itself is 55.

Finding the integers
Precalculus Homework

05/22/17

#### The diagonal of a square tile is 4 inches longer than its side. Find the length of the side.

Applying the concept- Dimensions
Precalculus Homework

05/22/17

#### The price of gas increased by 20% from July to August, while your consumption of gas decreased by 20% from July to August. What is the percentage change in gas?

a. No change b. 5% decrease c. 4% increase  d. 4% decrease
Precalculus Homework

05/22/17

#### The sum of three consecutive even integers is 42. Find the integers.

Numbers- applying the concept
Precalculus Homework

05/17/17

#### Find the sum of the series. 6+18+54+162+⋅⋅⋅+6(3^9)=

need help finding the sum of the series
Precalculus Homework

05/17/17

#### Write the sum of the following series using sigma notation. 44+37+30+23+16+9 S=∑n=0af(n), where a=Entry field with correct answer 5 and f(n)=Entry field wi

I have part a i just need help with part b thanks in advance for any help i get
Precalculus Homework Minimum Optimization

05/11/17

#### Optimization problem? Please help!!!

Given two numbers with a difference of 14, find the minimum for the sum of 4 times the larger number and the square of the smaller number.
Precalculus Homework

05/09/17

#### Determine the long-run behavior of the rational function. 1x+1+4xx+6 As ∞ x→∞, 1x+1+4xx+6→Entry field with incorrect answer . As ∞ x→-∞,

looking for the long run behavior
Precalculus Homework

04/24/17

#### Make the trigonometric substitution x = a tan θ for −π/2 < θ < π/2 and a > 0

Simplify the resulting expression: x^2/sqrt(a^2+x^2).   I actually have no idea how to go about solving this at all. If anyone could be kind enough to explain this to me step by step, I'll be... more
Precalculus Homework

04/24/17

#### What expression is equal to tan(arccos(2x))?

I feel like the answer is sqrt(1-4x^2)/2x (The square root is only over the 1-4x^2). I'm just asking for confirmation because I only have a limited amount of tries to submit a problem and I want to... more
Precalculus Homework

04/24/17

#### Find all exact solutions of the equation tan(3x)=sqrt3 in the interval [0,π)

I got the answer of π/9, but I'm not so sure about it. I'm not the strongest in this unit so far so any explanation would be greatly appreciated.
Precalculus Homework

04/24/17

#### Find all exact solutions of the equation tan(x)=-1 in the interval [0,2π]

I got the answer of -π/4 +- πn and -3π/4 +- πn. Is this the correct answer? I'm asking because I think it's right, but I only have a limited number of tries to submit it.
Precalculus Homework

04/06/17

#### Write the equation as a function of x in the form y = a sin(bx + c) for a > 0, b > 0, and the least positive real number c.?

(http : // www . webassign . net/waplots/5/9/3db62208ecce8388e36f5fcdec8fe3.gif) image here I know that the amplitude is 5 and the period is 3pi (I think, correct me if I'm wrong), but how do I... more
Precalculus Homework

04/06/17

#### What are the possible values of the angle θ if (cos(θ))^2=1/2 and sin(θ)=-sqrt2/2 (Only the numerator is under the square root)

The values of θ are in radians and are between 0 and 2π . Enter your answer in exact form.   I needed to enter in a smaller value and a larger value. However, I got the answers of pi/4 and 3pi/4... more
Precalculus Homework

04/04/17

#### Determine the set of values of x where the function y=cos(x) is increasing where −2π < x < 2π.

(Do not include the endpoints of the intervals, and all intervals should be open intervals on all endpoints)   I don't really understand the instructions here. This is one of a few extra credit... more
Precalculus Homework

04/04/17

#### An arc on a circle subtends a central angle of "theta"=1/2pi radians, and the area of the sector is 98 cm^2.

(Determine the radius, r centimeters, of the circle. Write an exact number as an integer, fraction, or decimal.)   I'm very confused about arcs and angles and whatnot. I'm doing extra credit, but... more
Precalculus Homework Angular Velocity Linear Velocity

03/31/17

#### one gear wheel turns another

One gear wheel turns another the teeth being on the rims. The wheels have 40cm and 50cm radii, and the smaller wheel rotates at 20rpm. find angular speed of larger wheel in radians per second
Precalculus Homework

03/18/17

#### Pre Calc: Identities

Find all solutions to the equation on [0,2π)sinxcotx^2-sinxcsc^2 x=1/2
Precalculus Homework Math Word Problem Trignometry

03/11/17

#### A bike wheel has a circumference of 113 inches and travels 791 inches on a road.

How many times did the wheel rotat? How many radians did it turn?   ps. I need to know how to get the answer, thx!
Precalculus Homework

03/10/17

#### Decay rate,k is 2.7% per year=-0.027. What is the half-life in years

i need help understanding word problems in precalculus algebra.

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