What additional information is needed to prove that the triangles are congruent by sas

SAS:side-angle-side, therefore you would need to prove that 2 sides that are adjacent to and angle are congruent to the save 2 sides and angle on another triangle

No, they are not equivalent. The first term, -4 1/2 equals 4 whole units and one half unit. All negative. So it’s like you have someone 4 and 1/2 dollars.

The second term, (-4)1/2 means multiplying -4 times 1/2. Doing the multiplication for this gives you -4/2. Solving the division here is -2. It’s taking away 1/2 dollar 4 times.

I hope this helped. Happy to answer any questions you have.