Experienced

Valuable

Very simply move all the numbers to one side,
So add an X to both sides to get rid of the X on the left, you get
5+23=X+9
Then take away 9 from both sides to get; 5+23-9=X
Then add up all the numbers and you have; 19=X


Maths

5 + 23 - X = 9

For linear sequences it is
Nth term=dn+(a-d), where a is the first term and d is the difference.

For quadratic sequences;
Nth term=a+(n-1)d+1/2(n-1)(n-2)c
Where a is the first term,d is the difference between the first two numbers and c is the second difference

What are the equations when working out geometric or arithmetic sequences?

It depends on the triangle, and there is a whole topic that you need to know that I could teach on just triangles.

Calculate the area of this triangle. 17 times 8 times 15. What is the answer and what do you do after it

Very easily:
1)how many 32s fit into 6, see the answer is 0 remainder 6, then you move the remainder 6 onto the the second digit 5 to make 65
2)how many 32s fit into 65, the answer is 2 remainder 1. You move that 1 to the next digit to make 19
3)how many 32s fit into 19. Answer=0 remainder 19.
So the answer is 20 remainder 19

This is called long division which can be used with any division including decimals.

Mohamed Sharif-Eidarus

Profile

Q&A

About

Mohamed is verified

Education

Queen Mary University of London

Availability

Subjects

Mohamed Sharif-Eidarus