24
step-by-step explanation:
the graph shows 30% of students walk. 80 students were questioned, so the number that said they walk is
30% × 80 = 0.30 × 80 = 24
a28=58
a1=a1+(n-1)d
a28= 4+ (28-1)2
a28=4+(27)(2)
a28=4+54
i need more details sorry