What should be subtracted from 5by6 to get -7by18

Write the following as a base and exponent

Aroulette wheel has 38 slots in which the ball can land. two of the slots are green, 18 are red, and 18 are black. the ball is equally likely to land in any slot. the roulette wheel is going to be spun twice, and the outcomes of the two spins are independent. the probability that it lands one time on red and another time on black in any order is(a) 0.5 (b) 0.25 (c) 0.4488 (d) 0.2244

If you prove that ∆wxz is congruent to ∆yzx, which general statement best describes what you have proved?