# Posts by Alfonso

Total # Posts: 8

**Discrete math**

TRUE OR FALSE ? Justify your answer. a. There exist real numbers a and b such (a+b)^2 = a^2 + b^2. b. For any real number x, there exists a unique number -x such that x + (-x) = 0. c. Any integer n is either odd or even. d. Any real number x can be written as a fraction. Write...

*March 3, 2016*

**Math**

TRUE OR FALSE ? Justify your answer. a. There exist real numbers a and b such (a+b)^2 = a^2 + b^2. b. For any real number x, there exists a unique number -x such that x + (-x) = 0. c. Any integer n is either odd or even. d. Any real number x can be written as a fraction.

*March 3, 2016*

**Physics**

Many people mistakenly believe that the astronauts who orbit the Earth are "above gravity." Calculate g for space shuttle territory, 290 kilometers above the Earth's surface (dashed line in sketch). Earth's mass is 6 1024 kg, and its radius is 6.38 106 m (...

*October 5, 2013*

**Physics**

Surprisingly, very few athletes can jump more than 2.7 ft (0.82 m) straight up. Use d = 1/2 gt2 and solve for the time one spends moving upward in a 0.82 m vertical jump. Then double it for the "hang-time" -- the time one's feet are off the ground. Can you ...

*September 14, 2013*

**math**

Which of the following statements is true? A. all trapezoids are similar B.all isosceles triangles are the same C.all rectangles are similar D.all equilateral triangles are similar

*December 6, 2012*

**math**

find the following landmarks for this set to numbers 12,16,23,15,16,19,18

*October 15, 2012*

**algebra**

formula= P(x)=.1x^2+50x-300 where x is number sold what is ans. if P(100)=.1(100)^2+50(50)-300

*October 26, 2011*

**bio**

how does a Dichotomous Key work. Thank you for using the Jiskha Homework Help Forum. Be sure to visit the following sites: 1. http://students.ed.qut.edu.au/n2364379/MDB377/DichotomousKey.html 2. (Broken Link Removed) 3. http://www.enchantedlearning.com/subjects/plants/activity...

*July 24, 2007*

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