Pls help pls help pls help

303 seconds

Step-by-step explanation:

56.6+57.9+57.5+65.3+65.7

=303.0

Rounded to the nearest second

= 303 seconds

3 is greater then both of those numbers

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.