Which of the following building components keep opposite walls from spreading apart

If (a, b) is the solution to the system of equations shown above, and a and b are integers, then what is the value of a+b?

Susie ran a race. she ran 55 miles an hour, and the race took her tt hours to complete.

Tortoise shells and snail shells are similar in function: they protect the organism from predators. based on a comparison of the organisms in the images, what can you conclude? 1. tortoises and snails have homologous organs, and they’re evolutionarily related. 2. tortoises and snails have homologous organs, and they belong to same species. 3. tortoises and snails have analogous organs, and they belong to the same species. 4. tortoises and snails have analogous organs, and they don’t belong to the same species. 5. tortoises and snails have analogous organs, and they aren’t evolutionarily related.