Elliott Fletcher

Elliott Fletcher commented on Finding the formula for the $n^{\text{th}}$ term of linear sequences 7 years, 4 months ago

Main Parts

I think you should label each of the questions i) and ii) as you have done in the advice section

I think the expected answer in both of these questions is wrong, the answer that you have in the advice section is right, i think its just that you calculated the adding term using n=0 for the displayed answer.

Advice

i) where you have written nth term here it doesn't really display correctly, it looks like n^(t)h instead of n^th.

I think you should say "Our nth term will take the form 8n+b, where b is some constant"

ii) i think "them" should be "it"

I think you should say "Our nth term will take the form 5n+c, where c is some constant"

I think you use the wrong number when you say how much the original sequence is greater than the sequence for 5n by. 

Elliott Fletcher commented on Creating Frequency Tables 7 years, 4 months ago

Thanks for the feedback Vicky, i asked Christian and he helped me make the numbers variable

Elliott Fletcher on Creating Frequency Tables 7 years, 4 months ago

Gave some feedback: Needs to be tested

Elliott Fletcher commented on Extract common factors of polynomials 7 years, 4 months ago

Main Parts

a) i) good

ii) There is an issue with the marking here, i had 102y+12y^2, and had the answer as 6*y*(17+2*y) which was marked incorrect and the displayed answer was 6*y(2y+17).

iii) Again there is an issue with the marking here.

In the question you don't write an * between each of the algebraic variables in the first term, making it look different to the other term. I think this then creates an issue in the marking as the displayed answer i got was xyz(41xyz+3) so the answer is only correct if you don't include the * between the variables even though in the statement you tell the students to include the * in their answer.

iv) good

v) again there is an issue with the marking here in the same way as in iii)

b)

iii) there is an issue with the marking here too, even inputting the displayed answer is marked incorrect as numbas thinks it is not a valid mathematical expression.

Advice

a) (all questions) i would write any products in brackets just for neatness, e.g 74x+62 = (2*37x)+(2*31).

Also, be careful when writing out big products of variables like xyz, i think you need to have an * between each variable

And i think there should be full stops at the end of each calculation.

b)

I think the formula for the quadratic equation should be ax^2+bx+c = (x+n1)(x+n2)

iii) i would put brackets around the products here.

Sorry for all the feedback!

Elliott Fletcher on Extract common factors of polynomials 7 years, 4 months ago

Gave some feedback: Has some problems

Elliott Fletcher commented on Square and cube numbers 7 years, 4 months ago

Main Parts

a) i would write (x_n)^2 instead of x^2.

b) i would write (x_n)^3 instead of x^3. Also, its up to you but you could maybe include (x_5)^3 as an extra question here.

c) i think there should be a full stop after the inequality here.

Advice

a) i think there should be full stops at the end of each of the calculations, like after the 9 in the calculation for 3^2.

b) again i think there should be full stops at the end of each of the calculations.

c) i would say "Here is a table of square numbers for integers from 1-15"

I would also include an extra sentence before you calculate the square root of y^2. You could say "To calculate y we must calculate the square root of y^2," and then have a full stop at the end of the equation here as well.

Otherwise, this looks good!

Elliott Fletcher on Relative Frequency 7 years, 4 months ago

Gave some feedback: Needs to be tested

Elliott Fletcher on Probabilities of certain and impossible events 7 years, 4 months ago

Gave some feedback: Needs to be tested

Elliott Fletcher on Relative Frequency 7 years, 4 months ago

Gave some feedback: Needs to be tested