each of two congruent sides of an isosceles triangle is 2n + 7 and the third side is 3n. write two equivalent expressions for the perimeter, also combine like terms to find the perimeter

Question 5 spring semester final exam math evaluate

What is the missing step in this proof ?

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