# Pre- Calculus

21,152 results, page 49

### Biology

One of the differences between Cambrian animals and pre-Cambrian animals was the appearance of ___________ such as antennae as Cambrian animals evolved. Can somebody help me I literally have no clue.

### history

what aspects of post-Civil War industrialization presented the greatest contrast to pre-Civil War industrialization?

### Pre-Algebra ... again :-(

How do i go about finding the integers of a product and quotient ... like, product of -20 whose quotient is -5 ..... thanks again

### Pre-Cal

1) Verify the identity cos^2 B - sin^2 B = 2 cos^2 B -1 I know that cos^2 B - sin^2 B = 2 cos^2 B -1 by the double angle formula but I do not know how to show this.

### pre algebra

a used laptop computer sells for $696. that is a 40% reduction from the original price. what was the original price of the computer?

### Pre-Alegebra

IF the scale model of an 82 inch long table is 10.25 inches long, what is the scale used to create the model?

### pre-algebra

Terry has 43 dollars in a checking account.If terry writes a check for 62 dollars what is the new checking balance?

### Pre-Algebra

Identify the underlined place in 83.5851. Then round the number to that place. A. thousandths; 83.58 B. hundredths; 83.59 C. hundredths; 83.58 D. thousandths; 83.59 A?

### PRE CALC

Use matrices to solve the system. (If the system has infinitely many solutions, express your answer in terms of c, where x = x(c), y = y(c), and z = c. If the system has no solution, enter NONE for each answer.) 5x+2y-z=2 x-2y+2z= -1 3y+z= -17 ive done tons of these but this ...

### Pre Algebra

1.Which of the following numbers is rational? A \frac{4}{5} B √27 C 4.02002000200002... D √31 2.What type of number is shown below? 0.3133113331... A repeating decimal B rational C irrational D terminating 3.Select all the rational numbers from the list. 1 √2 2 8....

### calculus

Differentiate y=lnx You ought to have this memorized. y'=1/x for y= ln x dy/dx = 1/x This is the most basic and fundamental of log derivatives. If you are studying Calculus, and the topic is logs, I fail to understand why you asked that question. IS there a website that can ...

### Pre-Calc-Please check answer

1.Write 4+6+8+10 in sigma notation: I came up with sigma in the middle 3 on top j=0 on the bottom 2n+4 to the right of the signma sign 2. Find the 10th term of the sequence -1/5,-1/20,-1/80 this was a geometric sequence so I said a(subscript10) = -1/5*1/4^(10-1) =-1/5*(1/4)^9...

### Pre-Calc-Please check answer

1.Write 4+6+8+10 in sigma notation: I came up with sigma in the middle 3 on top j=0 on the bottom 2n+4 to the right of the signma sign 2. Find the 10th term of the sequence -1/5,-1/20,-1/80 this was a geometric sequence so I said a(subscript10) = -1/5*1/4^(10-1) =-1/5*(1/4)^9...

### Precalc

The figure shows the pre-image and first iteration for a set of transformations. If the iterations are carried on infinitely, the resulting fractal figure will have dimension given by Dimension=(LogN)/Log(1/r) It tells me to find N and r... What should I be looking for on the ...

### Pre-Calc

Convert Q = 2e^8t to form Q = ab^t Round all calculated values to three decimal places Q= my answer I got 2(2.980.9579)^t I don't think this is correct. I took 2e^8t and tried solving for just e^8 then tried to convert... It turned out messy

### Pre Calculas

If you deposit $5,000 in an account that pays 5% interest compounded annually, how much money will you have in your account at the end of 15 years? Write an exponential function that represents this situation. I got 1,500,000 but im not sure if i did it right and im stuck

### Pre-Calc

I have two questions how do you solve cos x=sqrt2-cosx on the interval of [0,2pi) and how do you verify sin^2(theta)/1-cos(theta)=1+cos(theta) without negating it to equal 1?

### Pre- algrbra

What property is c to the seventh power x 1= c to the seventh power?

### Pre-Calc

How do I simplify (tan x/(1 + sec x))+((1 + sec x)/(tan x))?

### Calculus II

Does anyone know of a very good website that can teach me to better understand the disk, washer, shell method to finding volume of irregular figures (solid of revolution)using of course, integration techniques (such as when to recognize integration with respect to y or X for ...

### trig/pre -calc

hello, i don't quite understand how to do this type of problem: 1. find the exact value of sin (pi/3). even more confusing is 2. find the exact value of csc^-1 (1). i would appreciate any kind of help! thank you!

### pre calc

a salt shaker is sitting 4cm from the center of a lazy susan. phoebe small spins the lazy susan through an angle of 120. how do i set this up to find how many radians the shaker turned?

### PRE CAL SEQUENCES

Given the following finite sum 1/(1*2)+1/(2*3)+1/(3*4)+1/(4*5)+....+1/(n(n+1)) a) Find the first 5 partial sums b) Make a conjecture for a formula for the sum of the first n terms c) Use mathematical induction to prove your formula

### Pre-calc help!

A vector has x component -7.9 and y component 10.5 What is the direction of the vector to the nearest tenth of a degree? I tried doing tantheta=10.5/-7.9, however I keep getting a negative angle less than one degree which I hope is not right. Help!

### pre calculous

solve each equation algebraically and check it by substituing into the orignall equation. 50e^0.035x=200 3LN(x-3)+4=5 Method of your choice by solving. logx^2=6 Logx^4=2 2x-2^-x/2=4 e^x+e^-x/2=4 500/1+25e^.3x=200

### pre calc

use an appropriate half-angle formula to find the exact value ofthe expression. tan22.5 write the product as a sum sinxsin5x write the sum as a product sin2x-sin7x

### pre - algebra

maria had $123 she spent $35,loaned $20 to a friend and received her $90 paycheck how much does she have now? so you would do 123 -20=103 and then 103 - 20=83 and 83 + 90 =wich is 173 so that would be the answer right?

### combusion -science

the reaction order with respect to C4H10 =.15 and the reaction order with respect to O=1.6 , the pre exponential factor =4.16.10^9 . the activation energy =125000 kl/kaul. write out an expression for the rate of butane destruction

### Pre-Algebra

Carpet Masters charges $9.50 per square yard to clean a carpet. If you have two rooms with an area of six square yards each, how much will it cost to have the carpets cleaned?

### Pre cal

A box with a square base and no top is to be made from a square piece of carboard by cutting 8 in. squares from each corner and folding up the sides. The box is to hold 7200 in. How big a piece of cardboard is needed?

### Pre-Algebra

A back-to-back stem-and-leaf plot showing the points scored by each player on two different basketball teams is shown below. What is the median number of points scored for each team?

### pre-calc help

Solve the given equation. (Enter your answers as a comma-separated list. Let k be any integer. Round terms to three decimal places where appropriate. If there is no solution, enter NO SOLUTION.) 5 sin^2(x)- 21 sin(x)+ 4 =0

### math

Hi, How do I improve my math skills? I can't calculate in my head (I.e 2x43), I would actually have to write it down to solve it. I took pre-calc, calc and didn't have problem understanding. I don't know what is wrong. what should I do?

### Math (pre-celc 12)

I'm not sure how to solve this equation algebraically: 38=20sin((2pi(t))/36)+22 I know the answer should be about 5.3 since I graphed it. I can get as far as removing 22 from the right and then removing 20 from the right by dividing by 20. To get 0.8=sin((2pi(t))/36)

### Calculus

Please look at my work below: Solve the initial-value problem. y'' + 4y' + 6y = 0 , y(0) = 2 , y'(0) = 4 r^2+4r+6=0, r=(16 +/- Sqrt(4^2-4(1)(6)))/2(1) r=(16 +/- Sqrt(-8)) r=8 +/- Sqrt(2)*i, alpha=8, Beta=Sqrt(2) y(0)=2, e^(8*0)*(c1*cos(0)+c2*sin(0))=c2=2 y'(0)=4, c2=4 y(x)=e^(...

### Pre-Algebra

Can I have someone check this please? I wouldn't want to do the whole page, then find out I had done them all wrong. :( [Percents of Change] A $100 digital watch is now $72 Decrease, 72/100 = negative percent. 100/72.00 = .72 .72 - 1 = 30%? Thanks. 30% is my final answer, ...

### pre-calc

A statement Sn about the positive integers is given. Write statements Sk and Sk+1, simplifying Sk+1 completely. Show your work. Sn: 1 ∙ 2 + 2 ∙ 3 + 3 ∙ 4 + . . . + n(n + 1) = [n(n + 1)(n + 2)]/3 Sk: 1 ∙ 2 + 2 ∙ 3 + 3 ∙ 4 + . . . + k(k + 1...

### Pre-Algebra[URGENT]

Need help on solving this one as well- A local telephone company charges $9.75 per month for basic service and $0.20 for each call made. You are allowed to spend more than $17.00 but less than $21.50 a month. What are the most calls you can make and remain within your budget? ...

### Pre Calc

Write a quartic function that has roots that are 3+5i, -4 and 7 and f(-3)=53. I have tried it a bunch of times and can't seem to get it. (x-3+5i)(x-3-5i)(x+4)(x-7) I multiplied them together x^4-9x^3+24x^2+66x-952 I was a little unsure what f(-3)=53 means. I thought I should ...

### Math - Pre-Algebra

44) A financial institution wishes to estimate the mean balances owed by its credit card customers. The population standard deviation is estimated to be $300. If a 98 percent confidence interval is used and an interval of ±$75 is desired, how many cardholders should be ...

### Pre-algebra

ughhhhhh! PA is so hard! my teacher is constantly comparing us to the regular math saying that if we can't figure it out then we should ask them. What does that even mean? we are more advanced! anyway... this website helps so much. Im definitely going to be posting about ...

### Pre-calc

A cardboard box with an open top and a square bottom is to have a volume of 45 ft3 . Use a table utility to determine the dimensions of the box to the nearest 0.1 foot that will minimize the amount of cardboard used to construct the box.

### 7th grade accelerated math / pre algebra

write two equivalent expressions for the area of the figure the figure is a triangle inside the triangle it says x + 4 and the #16 is written along the length of one side of the triangle. The answer is 8(x +4) and 8x + 32 but I don't know how they got it

### Pre-Cal: Limacons

Write the equations for two limacons (and if possible graph), (one sine and one cosine) with the same a and b values. (A does not have to equal b). You may choose to use cardioids or inner loop, dimpled, or convex limacons.

### Pre-Calculus

How can this identity be proved/verified? cscx-sinx=1/(secxtanx) I have tried starting on both sides of the equation to get to the other. By starting on one side of the equation and manipulating it to make it look like the other side, the identity will be proved. However, this...

### calculus

find f(x,y+k)-f(x,y)/k when f(x,y)=x^2y+2xy^2

### Calculus

If a, b, and c are digits for which 7 a 2 -4 8 b ========= c 7 3 then a + b + b = _______ (A) 14 (B) 15 (C) 16 (D) 17 (E) 18

### calculus

how do u find the inverse of 2^-t/4

### Calculus?

If a, b, and c are digits for which 7 a 2 -4 8 b ========= c 7 3 then a + b + b = _______ (A) 14 (B) 15 (C) 16 (D) 17 (E) 18

### Calculus

(1 - x)^4 * (2x - 1)^5 its a derivative how can i solve this?

### calculus

Find f(4) if S (0 to x) dt=xcospix.

### Calculus

Minimize S=x+2y with xy=2 and both x and y > 0

### Calculus

Find the derivative of f 0f x. f(x) = x^2 - 8x - 17 at x = 4

### Calculus

Find the derivative of f 0f x. f(x) = x^2 - 8x - 17 at x = 4

### calculus

f(x)={4x+5 if x<3 17 if x=3 2^x+4 if x>3 determine if f is continuous at x=3

### Calculus?

how do you expand Ln abs(ã7 x^3+2x^2)

### calculus

Let y = sin(x^2-3). find dy.

### Calculus

How do we integrate xlne^x .

### Calculus

How do we integrate 1/lnx.

### Calculus- Help please

I don't know how to do this, so I can't graph it. f(x)= 1/x-4 Thank you for the help.

### Calculus

How do I take the integral of (9t^3 - 3t^2 + t)/3t?

### Calculus

Let f(x)=7x/x–6 Then f'(9)= And after simplifying f'(x)=

### calculus

what is the integral of x^(2)arctan(6x) dx?

### Calculus

What's the derivative of y=400(2)^(x+3)

### calculus

R+10=100+12R

### Calculus

Let a=8, f(x)=|x-8|/x Is the value of the limit 0.

### calculus

what's integration of (tanx)^5?

### calculus

Expand the binomial: y = (x-3)^4

### Calculus _HS

Let f(x) = x2-x-6/x g(x) = x-3, find (f+g)(x) (f-g)(x) (f/g)(x) Help !!! thanks

### calculus

Differentiate the funciton H(x) = (x + x^-1)^3

### calculus

Differentitate the function y =4(pi)^2

### differential calculus

differentiate h(x)= 6x^2 - 1 / x^4 + 5x + 1

### 12th AP Calculus

find the dy/dx of: x^2=(x-y)/(x+y)

### Calculus

find the derivative of f(x)=(3)/(x-2) at x=4

### calculus

differentiate y = (cos x)/ (x^9)

### calculus

Find the derivative of: g(x)=ln(ln(x+1))+e^(x^(3/2)+(x/3))

### Calculus

what is the limit of x/(ln x) as x approaches 0?

### calculus

differentiate y=x sin((4)/x)

### calculus

why is the derivative of f(x)= e^lnx f'(x)=1?

### calculus

solve 4x^3-6x+2=0 for all x

### calculus

how do i reduced 76/100

### Calculus

if h(x)= (the antiderivative of) 2x^2 +8x-5 dx find h'(x)

### calculus ab

What is the integral of sin4xcos4x dx?

### calculus ab

What is the integral of sin4xcos4x dx?

### Calculus

Find: 1)x^2-y^2=15, normal at (-8,7)

### calculus

what is the limit as x -> 0+ (0 from the right) of |x|/x?

### calculus

lim x->(pi/3) (cos x -(1/2))/(x-(pi/3)) is?

### calculus

how do you integrate 30x^2/(x-2)(x+3)(x-5)

### calculus

how do you integrate 30x^2/(x-2)(x+3)(x-5)

### calculus

how do you intergrate (sqrt(ln r))/r

### Calculus

Let P(x,y)=5x^3y+8xy^3. Then Px(-1,1) is? And Pxy(-1,1) is?

### calculus

what's the derivative of cos3x

### Calculus

Find the F^(-1) (6) - inverse f(x) = x^5 + 3x^3 + x + 1

### Calculus

Solve for x 100 x (1/2)^t/3.8

### Calculus

Solve for t 100 x (1/2)^t/3.8

### Calculus

If f(t)=(t^2+6t+2)(3t^2+3) then f'(t)=_____? and f'(3)=______?

### Calculus

If f(x)=6arcsin(x^3) find f'(x)

### Calculus

Given that f(x)=x^6h(x) h(-1)=3 h'(-1)=6 Calculate f'(-1).

### calculus

solve for x: a)e^x=5 b) lnx=2