IGCSE Mathematics June 2021 - 4MA1/1H

IGCSE Mathematics June 2021 - 4MA1/1H

Contents:
00:00 - Intro
00:10 - Question 1
00:55 - Question 2
01:31 - Question 3
02:39 - Question 4
03:19 - Question 5
04:37 - Question 6
05:44 - Question 7
06:29 - Question 8
08:20 - Question 9
09:24 - Question 10
10:26 - Question 11
11:47 - Question 12
12:26 - Question 13
12:56 - Question 14
14:07 - Question 15
16:15 - Question 16
17:46 - Question 17
19:58 - Question 18
23:36 - Question 19
25:18 - Question 20
26:47 - Question 21
29:18 - Question 22
31:46 - Question 23
35:18 - Question 24
38:22 - Question 25
43:10 - Question 26

[senseidom]

Im confused on question 22. Why would it form triangle ADM specifically? How do you know where point M will be? When i was doing the question, I thought it would form triangle ADF. Why is that wrong? How did you know point M would be perpendicular to point D and not somewhere else?

[Subhanazeba]

Sir, in question 4 why are we multiplying by 4 and 10

[mimi-bjni]

in question 25, can we solve the equation of the cos the second time we used it without rearranging the formula? because i solved it that way so 4^2+4^2-2(4)(4) cosP= 4.226...^2
so it gave me 0*cosP= 17.859... but then when i try the cos-1 it gives me math error on calculator....
please explain if i misunderstood something
thank you

[xenon]

For 26, why does it have to be xOC not just x?

[h_kh]

in question one the mark scheme doesnt allow 690 it has to be from 696

[munasamatar]

Hello sir you have great videos you boost my grades from a grade 3 to a solid 6/7 but for question 14 could you not have just minus the upper quartile and lower quartile to find interquartile range ?? I got the same answer doing that method

[sarahmariah]

Hello - in question 21, why do you times the 5 by 5a-2.

[jimmybacon]

in question 23 how did u go from (n–1) to 1.5n?

[goalkeeper]

sir, in question 26, is it possible to form the second equation for OP as y(PB) + OB?

[sambenjamin]

There's a much easier way to do question 26