You can solve by using Pythagoras theorem.
Let the longest side be c.
a^2 + b^2 = c^2
If this holds, it is a right angle.
But, 3.5^2 + 4.5^2 is not equal to 5.5^2.
Factors of 121 are; 1,11, and 121. so it would be D.
No it is not the worst subject
There’s 15 all together because 10+5=15
