Answer:
Question I 28
Question II I only
Step-by-step explanation:
an = an-1 +n
a1 =1
a2 =an-1 +n = 1 +2 =3
a3 = a2 +3 = 3+3 =6
a4 = a3+4 = 6+4 = 10
a5 = a4+5 = 10+5 =15
a6 = a5 +6 = 15+6 =21
a7 = a6 +7 = 21+7 =28
Question II
1 miles = 1.6 km
1 miles = 5280 ft
1 miles = 1760 yds
10 miles * 1.6 km/ 1 miles = 16 km > 15 km yes
44880 ft * 1 mi/ 5280 ft * 1.6 km/ 1 miles = 13.6 km < 15 km no
15560 yds * 1 mi/ 1760 ys *1.6 km/ 1 miles = 14.145 km < 15 km no
