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Provide a graphical solution for the following system of equations. (x + 1)2 + (y + 1)2 = 25 x + y = 5 


write the structure of the polymer tetrafluoroethylene (up to 10 carbons in length)


The Loann Le Milling Company is going to purchase a new piece of testing equipment for $28,000 and a new machine for $53,000. The equipment falls in the three-year property class, and the machine is in the five-year class. What annual depreciation will the company be able to take on the two assets?


Determine whether the following random variable is qualitative or quantitative and also state the measurement scale of each variable.

(a) Species of snake.

(b) Temperature of water.

(c) The weight of babies at birth.

(d) Hair color.

(e) Rating of hotels as one star, two stars, etc.

(f) The scholastic aptitude tests of 250 incoming freshmen to a small college.

(g) Number of airplanes at Wonderboom Airport on Friday morning.

(h) Time taken by a messenger to deliver letters.

(i) The car models in the Mercedes Benz range.

(j) The time at which South African Airways arrives at OR Tambo Airport from Capetown on a Tuesday morning.


Basic tenets of the social constructionist to environmental problems

Test the following numbers for divisibility by 6,9,11 (do not divide or factorise)

a)6 798 340

b)54 786 978


How to remove sulphur from sulphide ore with chamical

Name chamical and process details please.

Without smelting only chamical process please



The mean of a normally distributed data is 23.6 with a standard deviation of 4.4. Which of the following scores is considered to be an extreme outlier?


Lynette was born with HIV and diagnosed at birth in 1990. Her chances of survival were incredibly slim. She lived in hospitals the first several years of her life. She has been on most HIV treatment regimens. She was constantly educated about HIV, but trying to understand it was so hard. Before she was eight, she lost both parents to AIDS. She had hepatitis C for a while, but it remained undiagnosed since high school. She graduated in 2009 and lived a ‘normal’ life. She went to university but always kept her status secret for fear of rejection. She even considered suicide as she felt that there was no reason to live.

3.3 According to Gouws (2019:142-143) there are a variety of factors at play a role in adolescents’ suicide. After reading the case study of Lynette above, which of these factors could possibly relate to Lynette’s inclination to commit suicide. Provide reasons for your answers. 


Lynette was born with HIV and diagnosed at birth in 1990. Her chances of survival were incredibly slim. She lived in hospitals the first several years of her life. She has been on most HIV treatment regimens. She was constantly educated about HIV, but trying to understand it was so hard. Before she was eight, she lost both parents to AIDS. She had hepatitis C for a while, but it remained undiagnosed since high school. She graduated in 2009 and lived a ‘normal’ life. She went to university but always kept her status secret for fear of rejection. She even considered suicide as she felt that there was no reason to live. (Taken from: “Avert”, 2009) 

3.1 What is the difference between HIV and AIDS?


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