Idon't understand? (questions 1 & 3)

Planning for the possibility that your home might get struck by lighting and catch on fire is part of a plan

What value of x will make the triangles similar by the sss similarity theorem?

Eric has challenged himself to walk 24,000 steps in 4 days. if eric walks the same number of steps each day, which function represents the number of steps eric still needs to walk to reach his goal with respect to the number of days since he started his challenge? a. y = 8,000x − 24,000 b. y = -8,000x + 24,000 c. y = 6,000x − 24,000 d. y = -6,000x + 24,000