tolong no 17 sampai no 27 y...

20. AB = √35²-21²
= √1225-441
= √784 = 28cm

22. K = s + s + s + s
58 = (2×(3m+5)) + (2×(m+8))
58 = (6m+10) + (2m+16)
58 = 6m+2m+10+16
58 = 8m+26
58-26 = 8m
32 = 8m
32/8 = m
4 = m

Borongan, Maaf tidak bisa jawab semuanya

20.
AB²= BC²-AC²
AB=√(35²-21²)
=√(1225-441)
=√784
=28 cm
21.
2(3x + ¼)= 5(2x-1/6)
6x + 1/2 = 10x - 5/6
-4x = -5/6-1/2
-4x =-5-3 /6
-24x = -8
x=8/24
x=1/3

22.
2(3m+5)+2(m+8)=58
6m+10+2m+16=58
8m+26=58
8m=58-26
8m=32
m=32/8
m=4