How (-1) mod 5 is equal to 9?

-1(mod 5)

The positive value added will be the new number .

see below

Step-by-step explanation:

when we say a≡b mod c

it means that c divides a-b

or that b is the remainder of a/c

so 9/5 the remainder is 4

so we have

9≡4 mod 5

we can substract 5 from both sides and the equation will still be true

9-5≡4-5 mod 5

4≡1 mod 5

if we do it by c divides a-b

5 divides 9-(-1)

5 divides 10

which is true so

9≡-1 mod 5

it is true

step-by-step explanation:

all the combinations add up i used   calculator

answer: a. 13/44

step-by-step explanation: judging by the information given to us, we are looking for experimental probability. we can see that 13 males have chosen chocolate ice cream. there are 44 ice creams in total (remember that the total is always the denominator). so our answer is 13/44.