Triangle ABC has perimeter 22cm AB=8cm

BC=5cm

By calculation, deduce whether triangle ABC is a right-angled triangle

Which mathematical statements are true? 1) if 3 is an odd number, then 3 times 3 is an even number. 2) if 6 is less than 7, then 4 is greater than 7. 3) six is divisible by 3, and 10 is a multiple of 2. 4) the average of the data is greater than the largest value in the data, or it’s less than the largest value in the data. 5) the slope of a linear graph is its rate of change, and the graph’s y-intercept is the initial value. 6) if an equilateral triangle has equal angles, then all its angles will measure 45°.

This is so hard and it’s for a test

Matt had 5 library books. he checked out 1 additional book every week without retuening any books. whats the matching equation