If 1 +2 is 21 and 2 + 3 is 36 what is 4 + 5

Step 1: We need to add the numbers.

Step 2: We need to multiply the obtained number with ‘7’.

Step 3: We need to add the obtained number with ‘0’.

Step 1: We need to add the numbers.

Step 2: We need to multiply the obtained number with ‘7’.

Step 3: We need to add the obtained number with ‘1’.

Step 1: We need to add the numbers.

Step 2: We need to multiply the obtained number with ‘7’.

Step 3: We need to add the obtained number with ‘2’.

Since, the options are not given, we can take the liberty to apply any method in this problem.

on your paper it doesn't say the answer but the the answer is altitude

step-by-step explanation: