Help with this I don't know how to solve please

Find the length of the diagonal of the rectangle. round your answer to the nearest tenth. || | | 8 m | | | | 11 m

Ab and bc form a right angle at point b. if a= (-3,-1) and b= (4,4) what is the equation of bc?

One number is 4 less than 3 times a second number. if 3 more than two times the first number is decreased by 2 times the second number, the result is 11. use the substitution method. what is the first number?