time is equal to distance over rate so
t = d/r
need a little bit more information for the second question.
hi! all you have to do is add 3 to both sides of the equation.
3 + -3 + a < -7 + 3
a < -4
hope this you!
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.