Mathematics - 29 October 2007

use everything you want

2007-10-29 22:56:41 · 8 answers · asked by boris l 1

um i need help my math book doesnt explain this

Graph

2007-10-29 21:54:30 · 7 answers · asked by theguywiththebigstick- What now! 3

1) A rectangular picture frame contains a 12” × 14” picture. What is the width of the frame if the total area of picture and frame is 288 square inches?

2) A metric print (picture) is square with sides of 15 cm. If it is to be enlarged so as to double its area, how much will the length of a side be increased?

3) A rectangle is 10 units longer than it is wide. When the length is decreased by 2-units and the width is increased by 3, the area is 141 square units. Find the original dimensions.

2007-10-29 21:54:20 · 5 answers · asked by Anonymous

Ok this equation is -2log3 1?x + 1/3log3 sqrt x


For some reason I keep getting 1/2log3x but I have a strong feeling that this is not correct at all can someone help me get on the right track please?

2007-10-29 21:09:10 · 3 answers · asked by iknownothing17 1

Please show me the steps to solve this question:
Factorise 2-x+2x^2-3x^3 completely. Hence, solve the inequality 2(1+x^2) < x(1+x)^2

2007-10-29 21:02:46 · 3 answers · asked by Anonymous

(y+5)(y+3)
it tells me to expand, but i cant with no number out side the brackets? so i dotn understand

plz help thanks!

2007-10-29 20:21:11 · 9 answers · asked by Anonymous

answer

2007-10-29 20:14:49 · 12 answers · asked by Anonymous

2007-10-29 20:14:35 · 4 answers · asked by MACDOG 1

2007-10-29 20:07:58 · 5 answers · asked by Eldar G 1

I have a new Job (woot woot) lol I'm a bit over excited hahaha, now I can finally quit my crappy job!

I've being working Part time the past years, because I've being studying in High School & College.
I've being paid by the hour (wages) and with the new job I'm given a Salary Package of $41,000 + Super Annuation & bonuses and stuff.

The Question is, How much do I get payed an hour?
I will work 40 hours a week.

So it's 41,000 divded by 52(weeks) = $788.45
$788.45 divided by 40(hours) =$19.70

so I can defiantly say $19.70 an hour?

lol hahahaha I know I kind of sound dumb, but is my calculations right?....$19.70/hour

How much does the superannuation take?

2007-10-29 20:03:17 · 3 answers · asked by tayzar1 3

An example is this: "The arch of an underpass is a semi-ellipse 60 ft. wide and 20 ft. high. Find the clearance at the right edge of a lane if the edge is 20 ft. from the middle."It took me hard to find another one of this. Pls. help me especialy to those who are Math Whiz. Pls help me. This is our project in analytic geometry. Thank you and good day!

2007-10-29 19:53:48 · 2 answers · asked by blossom_cutie05 1

2x = 12 – 2y and 6y = 36 – 6x
The teacher offered $20 to the first student to solve these equations for x and y. Just how generous was the teachers offer? Show working.

2007-10-29 19:48:38 · 11 answers · asked by Josh M 1

can you help me find what the inverse laplace of the following is please ?

1/[s(s^2 + s + 1)] + s/(s^2 + s + 1) + 1/(s^2 + s + 1)

2007-10-29 19:30:38 · 1 answers · asked by phil h 2

If an object is dropped, the distance it falls is given by D=1/2gt^2 where g is about 32 ft. If this is correct explain why..if not explain why and give correct method!

oh ya and the number after ^ is the exponet just to letcha kno

2007-10-29 18:30:07 · 2 answers · asked by Anonymous

2x-5=height
3(4+x)= length

if the perimeter of the rectangle is less than 52, find all possible values for x.

2007-10-29 18:18:42 · 10 answers · asked by nikkecola17 3

Question: Suppose you know that the series SUM(bn) from n=1 to infinity converges. What can you say about the series SUM(bn^n) from n=1 to infinity?
Answer: I believe the series converges absolutely by the ROOT test since limit |bn|=0 as n goes to infinity for a convergent series.

2007-10-29 18:13:30 · 3 answers · asked by curious 2

stab at it! Thanks!

Solve each irrational equation. If an equation has no solution, so state:
a. 3/x - 1/6 = 1/x
b. 13/y-1 - 3 = 1/y-1

A car travels 60 miles in the same time that a car traveling 10 per hour faster travels 90 miles. What is the rate of each cars?

Find the indicated root or state that the expression is not a real number:
a. 3sqrt8/125 This is the cube root of 8/125
b. -4sqrt81

Simplify each expression:
a. sqrt45x^23
b. sqrt96/3

Add or subtract as indicated:
a. 4sqrt72 - 2sqrt48
b. sqrt75 - sqrt48

Multiply as indicated:
a. (√11 - √ 5 ) (√11 +√ 5)
b. ( 1 + √2)^2

Solve each radical expression:
a. 64^2/3
b. (-8 )^-4/3

Solve by completing the square:
X^2 –12X + 27 = 0

Solve by using the quadratic formula:
a. X^2 = 2X + 4

Solve each equation:
a. X^2 = -100
b.5X^2 = -125

2007-10-29 18:13:16 · 1 answers · asked by Anonymous

average velocity after t seconds of a falling object differs among celestial bodies.

earth -4.9t m/s
moon -.83t m/s
jupiter -11.44t m/s

suppose an object is dropped from 100 meter tall structures on the moon, earth and on jupiter write parametric representations of each motion

2007-10-29 18:08:38 · 1 answers · asked by Anonymous

solve the equation on the intervel of 0 < equal to theta < 2 pi

a) cos^2 theta - sin ^2 theta + sin theta = 0

b) cos (2 theta) + 4 cos theta +3 = 0

please help me and explain this step by step, thanks

2007-10-29 18:08:21 · 2 answers · asked by Anonymous

Does anybody know how to do the nonlinear regression in Excel?

2007-10-29 18:07:05 · 2 answers · asked by Anonymous

A Sphere with a radius x-1/2 is floading in a cylindrical tank of water with a radius (x-1). Determine the volume of water in the tank. Express your answer as polynomial in factored form. Leave your answer in exact form.

Formula
PI (radius)^2 (height)-4/3 PI (radius)^3

PI(x-1)^2(x+4/6)-4/3(PI)(x-1/ 2) ^3

PLEASE HELP!!! (factor then simplify)
Thanks :)

2007-10-29 17:58:07 · 1 answers · asked by C L 1

for the problem y = 4 cos (x/2 + pi/2) there are 2 ways to discover the period.

1. period = 2pi/b and in this case (x/2 + pi/2) = 1/2(x + pi)
thus 2pi/.5 = 4pi

2. however when I try and solve algebraically for the inequality:
0 less than equall to 1/2(x+pi) less than equall to 2pi
I always get an interval of -pi, pi wich has a period of 2pi.

What am I doing wrong in # 2?

2007-10-29 17:57:37 · 3 answers · asked by skibum 2

determine the total area of the trapazoid
A=1/2(base1+base2)height

1/2[x-2/1+X+12x-9/2x^2-x-3](3-2x/x3+27)

Express your answer as a rational expression (single fraction) in factored form...

THANKS GUYS!!!

2007-10-29 17:53:26 · 1 answers · asked by C L 1

A highway patrol plane flies 3 mi above a level, straight road at a steady 120 mi/h. The pilot sees an oncoming car and with radar determines that at the instant the line-of-sight distance from plane to car is 5 mi the line-of-sight distance is decreasing at the rate of 160 mi/h. Determine the car’s speed along the highway.

2007-10-29 17:52:34 · 2 answers · asked by Blesson 2

describe the set {1,5,7,8} using union and intersection

2007-10-29 17:44:08 · 3 answers · asked by nikkecola17 3

Find an exponential function of the form f(x)=ba^x+c with y-intercept 2, horizontal asymptote y=-2, that passes through the point P(1,4).
a. f(x)=-2(2^x)
b. f(x)=2(2^x) -2
c. f(x)=2(1.5^x)-2
d.f(x)=4(1.5^x)-2

2007-10-29 17:42:56 · 2 answers · asked by austin 1

The starting equation was 1/√x which i plugged into the theorem and got this {(x^(1/2) - (x+h)^(1/2)}/{h(x+h)^1/2(x)^(1/2)} So i changed it to ^1/2 to make it eaiser. But i can not figure out how to get the h out of the top to cancel out the bottom so i can plug 0 in for h. Any help on the 2nd step would be wonderful.

Thanks,

Brad

2007-10-29 17:38:48 · 4 answers · asked by Brad25 1

we did peer evaluation in class and the math teacher wrote the answers on the board. the following questions i got wrong. but i dont understand how. are these answers right or did my math teacher miscalculate.?

2/3 +3/4 i got 15/12 and in simplified form i got 1 1/4

2/3 + 5/6 i got 9/6 and in simplified form i got 1 1/2

1 1/6 + 2 1/2 i got 88/ 12 in simpilfied i got 9 1/3

1 1/3 + 2 3/8 i got 157/24 in simpilfied for i got 6 13/ 24

please explain

2007-10-29 17:37:49 · 7 answers · asked by Anonymous

Find the exact solution to the equation 3^x+5=9x.
a. 5/3
b. 5/2
c. 5
d. 6

2007-10-29 17:37:11 · 4 answers · asked by austin 1

What is 5/8 (1/4 / 1/2) =

2007-10-29 17:34:19 · 9 answers · asked by acuraboy1978 2