Answer:
Step-by-step explanation:
You do not need to where the formula comes from but, just for fun, here’s a hint
To add up the numbers 1 to 10
Write out the numbers
1 2 3 4 5 6 7 8 9 10
Write them backwards
10 9 8 7 6 5 4 3 2 1
Add up both lists
11 11 11 11 11 11 11 11 11 11
This is 10 × 11 = 110
But this is twice the sum as two lots were added together
So the sum of the numbers 1 to 10 is 110 ÷ 2 = 55
ArSeqSum Notes fig4, downloadable IGCSE & GCSE Maths revision notes
Answer:
Step-by-step explanation:
24 hope it helps you!!
Answer: 3/8
Step-by-step explanation:
1/2 × 3/4
Multiply the numerators: 1 × 3 = 3
Multiply the denominators: 2 × 4 = 8
I hope this is clear, have a great day.
Answer:
7-x
Step-by-step explanation:
49 - x^2 is a perfect square so
it factors to :(7+x)(7-x)
since there is a negative in 49 - x^2, it would make sense that the answer would be a negative to get that negative answer in the first place (negative times a positive equals a negative)
Forgive me for my lame explanation :')
Given:
The value is 
.
To find:
The values from the given options which are equal to the given value.
Solution:
We have,
It can be written as:
From the standard trigonometric table, we get
From the above values it is clear that the value of 
and 
are equal to 
.
Therefore, and and equal to . So, options B and C are correct.
