Question

Help me please!!!
no. 36.37.38.39

Answer 1

Nomor 36
kita lambangkan QT = a

ST/RP = QT/QP
 8/12  =  a/(a+3)  
 2/3  =  a/(a+3)
 
sampai sini lalu dikali silang
2(a+3) = a(3)
2a + 6 = 3a
2a - 3a = -6
-a = -6
a = 6

nb : garis miring itu lambang pecahan atau per..

nomor 37
V = 4/3 * 3,14 * 10^3 = 4/3 * 3140 = 4186,67 cm^3

nomor 38
rata-rata = 20+50+40+70+30 dibagi 5
= 210/5 = 42 kwintal

nomor 39
360 - (162+78+72) = 48

48/360 * 180 = 48/2 = 24 orang

maaf kalo berantakan, lagi ngantuk

Answer 2

Nomer 38.
20+50+40+70+20
= 210 : 5
= 42

nomer 39
162°+78°+72°= 312°
360°-312°=48°

48°
-- x 360° = 24 siswa
180