August 2015

Adse C. Miks's picture

Geometric series

Submitted by Adse C. Miks on August 2, 2015 - 4:56pm

the question in the book is write the first four terms of the g.s. , if the sum of the first and fourth terms is 195 and the sum of the second and third terms is 60.
asub1+asub1r^3=195 (1)
asub1r+asub1r^2=60 (2)
Dividing (1) by (2)
r=1/2; r=4
Substitute in (2)
asubn=192; asub1=3
Therefore, the four terms are 3, 12, 48, 192.
My question is how did they get r=1/2 and r=4?

Discussion on: 820 Unsymmetrical I-section | Moment of Inertia

Submitted by mrramos on August 3, 2015 - 1:19pm

Following is a discussion on the Reviewer item titled: 820 Unsymmetrical I-section | Moment of Inertia. Feel free to add your own comments!

grade 1 math

Submitted by dhara geecee on August 4, 2015 - 12:15pm

wp_20150803_010.jpg

Kindly answer 1 and 3

Discussion on Problem 348 | Equilibrium of Non-Concurrent Force System

Submitted by statics15 on August 6, 2015 - 5:52am

In this problem …the fixed support at point A has been shown to have only Ax i,e horizontal component while the fixed support at point B has both horizontal and vertical components, Bx and By. Is there any specific reason for the support at point A to not have the vertical component? I don’t know what I am missing here.Any help would be greatly appreciated.=]].

problem:348

Juvemar XD's picture

Math 111

Submitted by Juvemar XD on August 7, 2015 - 5:28pm

The area of a regular pentagon is 560. Find the radii of the circumscribed and inscribed of a circle?

differentiation of transcendental functions

Submitted by christian10_mat... on August 8, 2015 - 10:44am

Evaluate the limits
1. lim sin3x/sin2x
X-0

2. lim 1-cosx/4x^2
X-0

Pls answer.
thank u

Discussion on: Problem 522 | Friction

Submitted by Benjamin_Molina on August 14, 2015 - 9:23am

Following is a discussion on the Reviewer item titled: Problem 522 | Friction. Feel free to add your own comments!

Discussion on: Problem 535 | Friction on Wedges

Submitted by Benjamin_Molina on August 16, 2015 - 8:16am

Following is a discussion on the Reviewer item titled: Problem 535 | Friction on Wedges. Feel free to add your own comments!

Discussion on: Problem 536 | Friction on Wedges

Submitted by Benjamin_Molina on August 16, 2015 - 8:32am

Following is a discussion on the Reviewer item titled: Problem 536 | Friction on Wedges. Feel free to add your own comments!

Kevin Astra's picture

Discussion on: Problem 001-mj | Method of Joints

Submitted by Kevin Astra on August 21, 2015 - 9:22pm

Following is a discussion on the Reviewer item titled: Problem 001-mj | Method of Joints. Feel free to add your own comments!

The volume of the spherical segment is 100 cubic meter with an altitude of 8 meter. What is the volume of the sphere?

Submitted by dhara geecee on August 22, 2015 - 11:56am

The volume of the spherical segment is 100 cubic meter with an altitude of 8 meter. What is the volume of the sphere? Kindly show the solution. Thank you.

Discrete Mathematics

Submitted by Rima on August 23, 2015 - 9:52pm

What is the answer to the question If 5n+6 is odd then n is odd
using the contraposition/contrapositive.

Help :(( Exponential Decay

Submitted by Aesha on August 24, 2015 - 11:09pm

a radio active element follows the law of exponential change and has a half-life of 38 hours. how long will it take for 90% of the radioactivity of the element to be dissipated ?

Rate problem

Submitted by Aesha on August 24, 2015 - 11:28pm

A man in a wharf 6m above the water pulls in a rope to which a boat is tied at the rate of 1.2 m/s. at what rate is the boat approaching the wharf when there is 7.5 m of the rope out ?

Equation of Line: Normal to conic with product xy in the equation

Submitted by Aesha on August 24, 2015 - 11:45pm

Find the equation of the normal line to the curve x^2 + 2y^2 - 2xy - x = 0 at the points where it crosses the x-axis .

Discussion on: 02 - Bullet fired from the top of a building

Submitted by Benjamin_Molina on August 25, 2015 - 8:47am

Following is a discussion on the Reviewer item titled: 02 - Bullet fired from the top of a building. Feel free to add your own comments!

Calculator Techniques for Differential Calculus

Submitted by Aesha on August 27, 2015 - 7:23pm

Ask lng poh , meron poh bang calculator technique for differential calculus ? Paturo poh , thankyou .

Enginnering Mechanics/Statics/Friction

Submitted by ShadowWalker. on August 28, 2015 - 8:27pm

Can anyone answer this?

Friction

Discussion on: Superimposed or Built-up Beams

Submitted by patranco on August 28, 2015 - 11:32pm

Following is a discussion on the Reviewer item titled: Superimposed or Built-up Beams. Feel free to add your own comments!