Question

a) what should be added to 10 so that the sum become -21?

b) what is the number which gives 12 when -39 is substracted from it?

Answer 1

(a) 10 + x = -21
x = -21 + (-10)
x = -31

(b) x + (-39) = 12
x = 12 + 39
x = 51

Answer 2

A)let the required no.be x 10+x=-21 X=-21-10    =-31(answer) B)let the required no.be x  X-39=12 X=12+39 X=51(answer) Hope this helps you please mark me as brainliest if you like