120 students are asked whether they like biology or chemistry or physics best.
52 of the students are in year 11, the rest are in year 10.
45 students like physics best.
20 of the year 11 students like biology best
16 of the 30 students who like chemistry best are in year
10.
Work out how many year 10 students like physics best.
(4 marks)

-2

7 - 9 = -2

reversed:

-2 + 9 = 7

25 questions , because they start with 100.  

350-100=250 .  

. 250/10=25

step-by-step explanation:

first take off 100, then what x 10 = 250? that is your answer. (25)

step-by-step explanation:

the true statements are:

r = set of real numbers

n = set of natural numbers, 1,2,

w = n u{0} = {0,1,}

answer:   (s+1)(s+4)

step-by-step explanation:

factor s2+5s+4

s2+5s+4

=(s+1)(s+4)