Activity 1: Let's Recall Let's Find Out: Sum of integers Let's Use These Materials: Mathematics notebook and ballpen Let's Do It This Way: 1. To answer the riddle, compute the sum of the given integers. 2. Write the letter of the problem above its corresponding answer found in the box. 3. Write the answer in your Mathematics notebook. The first leiter is done for you. 29 Who was the English mathematician who first used the modern symbol of equality in 1557? R B (-65) + (-20) 38 + (-15) 45+ (-20) (78) + (-15) C 30 + (-20 D (110) + (-75) T (16) + (-38) E (-75) + (20) O E​