Triangle abc is similar to triangle def, then ab is congruent to de

If it's one of those always, sometimes, never questions, then it is sometimes.
Similar triangles have the same angles, but don't necessarily have the same length of sides.

Google it that might work

1. 0.3 •4 is the same as 4 groups of 0.32. 7•0.8 is the same as 7 groups of 0.83. it increases by 0.5 every time, so 0.5x4 it increases by 0.9 every time, so 0.9x5. 0.9•12=10.86. 0.47•5=2.35i can finish the next ones in a separate post