Ann made a 3 -step staircase using 18 toothpicks as shown in the figure. how many toothpicks does she need to add to complete a 5 -step staircase?

I'm confused on this could anyone me and show me what i need to do to solve it.

In the diagram, the ratios of two pairs of corresponding sides are equal to prove that almn - axyz by the sas similarity theorem, it also needs to be shown that x 6 z un z zz un = 2x zləzz lezy

If you flip a coin 3 times, what is the probability of flipping heads 3 times? a. p(3 heads) = 3/8 b. p(3 heads) = 1/6 c. p(3 heads) = 1/8 d. p(3 heads) = 1/2