Please could you check the following as I want to see if my workings are correct:
Please help by showing me your working out:
a) X^2 x X^4 (I thinks its X^6?)
b) 2(3a + b) - (a - 2b) = (is it this, 6a + 2b - a - 2b = 5a (correct?)
a) (a + b) (a - b)
b) (a + b) (b + c) (c + d)
3) Evaluate z when:
a) z = __________
/ x + y
/__________ and x = 5, y = 3
\/ x + y
b) 1 - z = 4z - 9
c) z - 1 2z + 3
z + 3 2z - 3
I really appreciate your kind help, please help by showing your working as I want to learn maths really well so badly!
I know this may look easy for some people but I'm just grasping it. Please look at the following simultaneous equation and see what you get. Thanks alot.
Please show me the easiest way to work this out so that I can apply it to other questions.
3p + 2q = 9
4p - 6q = 25
Please let me know how you worked it out as well.
Please help me if you can!
Maths is not my strongest areas and never has been and thats why websites like these are a god send! I'm trying to help my son but want to clarify the following questions with you experts before I can explain all to him.
Please help me I would really appreciate it and let me know how you got to the answers, i.e. the working out ; o ).
1) A Student has obtained marks of 65, 72, 62 and 75 in her first four examinations. She has one examination left to do and hopes to obtain a distinction which requires an average mark of 75 over 5 examinations.
a) Calculate her current average mark. 
b) Explain, giving your reasoning whether she can get a distinction given that the maximum mark available on the final examination is 100? 
2) A multiple choice examination consists of 20 questions each of which have 4 possible answers. A candidate gets 5 marks for a correct answer and has 2 marks deducted for an incorrect answer. (if the candidate does not answer the question no marks are awarded or deducted.) The pass mark is 30.
a) What are the maximum and minimum possible examination marks? 
b) What is the minimum number of questions a candidate needs to answer correctly in order to pass the examination? 
c) Estimate the number of marks a candidate would get if he or she answered each question by picking 1 of the 4 multiple choice answers at random 
d) Assume a candidate answers every question, and let x be the number of questions he answers correctly.
i) Write down an expression in terms of x for the number of questions he answers incorrectly. 
ii) Write down an expression in terms of x for the number of marks he obtains. 
iii) If the candidate obtained 44 marks, how many answers did he answer correctly. 
iv) How many must he answer correctly to pass the examination? 
e) If, instead, 4 marks are awarded for each correctly answered question
i) what is the minimum number of questions a candidate needs to answer correctly in order to pass the examination? 
ii) If a candidate answers all the questions, how many must a candidate answer correctly to pass the examination. 
END OF QUESTIONS.
Thank you very much, I appreciate your kind help.