Question

Kak tolong bantu nomor 18 dengan caranya ya...! Tolong ya... butuh xpress ni...

Answer 1

M × phi = phi × (R^2 - r^2)
m × phi = phi × (9^2 - 4^2)
m × phi = phi × (81 - 16)
m = (phi × 65) / phi
m = 65

Jawabannya B.