Tolong dong kk buat jawaban 7,8,9,10

7.
tinggi pohon / bayangan pohon = tinggi tiang / bayangan tiang
t/2,1 = 3 / 1,8
t = 3 / 1,8 x 2,1
t = 3,5 m
tinggi pohon adalah 3,5 m

8.
panjang karton = 30 cm
lebar karton = 20 cm
lebar foto = 20 - 3 - 3 = 14 cm
panjang foto = p

p/14 = 30 / 20
p / 14 = 3/2
p = 3/2 x 14
p = 21 cm

sisa karton = 30 - 21 - 3 = 6 cm

9.
pq / rs = pr / rt
pq / 6 = 9 / 3
pq / 6 = 3
pq = 3 x 6
pq = 18 cm

qr / st = pr / rt
(3 + qt) / 8 = 9/3
(3 + qt) / 8= 3
3 + qt = 24
qt = 24 - 3
qt = 21 cm

10.
ef = (ab x cf + dc x fb) / bc
ef = (25 x 4 + 16 x 6) / 10
ef = (100 + 96) / 10
ef= 196/10
ef= 19,6 cm

7. 2,1/1,8=X/3
1,8X=2,1 × 3
1,8X= 6,3
X=6,3/1,8
X=3,1/0,6
X=31/10:6/10
X=31/10×10/6
X=310/60
X=5 1/6