Answer:the answer is 15
Step-by-step explanation:
Simple we add 25+25 and get 50. Then we subtract 65-50 and get 15
x=x-12
x+x-12=50
2x=62
x=31
Answer: 1 & 4
Just did it
Answer:
Given
Required
Make t the subject
Cross Multiply
Collect Like Terms
Factorize:
5050
S=n*(n+1) / 2
S=100 * (100+1) /2 = 50 * 101 = 5050