If a positive number represents above sea level and a negative number represents below sea level, (a) use a directed number to represent each of the following situations: (i) 15 m above sea level, (ii) 10 m below sea level: (b) describe the meaning of ‘-21 m’.

we are given that

a positive number represents above sea level and a negative number represents below sea level

(A)

(i)

15 m above sea level means positive number

so, that number would be +15m

(ii)

10 m below sea level means negative number

so, that number would be -10m

(B)

"-21m"

Since, sign is negative

so, it will be below sea level

so, 21m below sea levelAnswer

you'll have to attache the image of the bar graph in order for us to answer : )

step-by-step explanation: