Discrete Mathematics Answers

Decrypt the word “xqjjud” mathematically with a shift of 5

Using Caesar cipher, encrypt the word “pizza” mathematically with a shift of 3

The following word was encrypted using a Caesar cipher with a shift of 2: ecguct. What word is it? 

. Andy is facing West, he rotates 1260 clockwise. What direction is he now facing? (Note: A circle has 360 degrees)

It is 8:00 AM in our 24 hour world. What time is it in a 3 hour world? 

Find a number which is congruent to 2 mod 3 and congruent to 3 mod 4.

Perform the following modular arithmetic by applying the addition/subtraction rule.

(a) (9+15) mod 7

(b) (15-23) mod 5

(c) (-47 x (5+1)) mod 5

Find the value of x if 2x ≡ 7 (mod 11). (*Hint: The value of x should be between 0 to 10)

Find five different integers a such that a≡3 (mod 6)

I do my laundry every 20 days. Last week, laundry day fell on a Friday. On what day of the week will laundry fall next?