Can I pls have help with question 8 and 9

2.88 kilometers

Step-by-step explanation:

8. If the round trip took 17/20 of an hour.

How long does it take in minutes?

1 hour=60 minutes

17/20*60

=17*3

=51 minutes

9. Calculate the distance between the supermarket and Hilary's house

Speed=distance/time

Distance=speed × time

Total speed=30km/h+12km/h

=42km/h

Total time=17/20 hour

Time spent for 30km/h=30/42*17/20

=510/840

=0.61h

Time spent for 12km/h=12/42*17/20

=204/840

=0.24h

Supermarket to Hilary's house=12km/h

Distance=speed × time

=12×0.24

=2.88 kilometers

395.84

step-by-step explanation:

2πrh+2πr²

2 (pie)(radius)(height)+2(pie)(radius)^2

this may not be at all, but i use the same website you're using for school, and if i'm stuck doing one of these i try to look for it on the section.