Tolong nomor 1 dan 7 ya gan

1.) Dik = 30kaleng = 30000liter air Arti nya = 1 kaleng = 30000/30 = 1000liter air 1000 liter = 1000dm^3 Jari jari = 5dm Di tanya = tinggi kaleng .....? 3,14 × r ×r × t = 1000dm^3 3,14 × 5 × 5 × t = 1000dm^3 78,5 × t = 1000dm^3 t = 1000/78,5 = 12,73885 7.) 1/x = 1/7 + 1/10 1/x = 10/70 + 7/70 1/x = 17/70 X = 70/17 = 4,11764 menit( jawaban yang tepat) Kalau boleh jadikan jawaban terbaik yah