Di jwb yaa dgn cara sendiri bsok di kumpul

1) K = ( 2y ) + ( y + 3 ) + ( 3y - 4 )
K = 6y - 1

b) y = 15
maka
K = 6y - 1
K = 6(15) - 1
K = 90 - 1
K = 89 cm

2) h = 20t - 3t²
h = 20(5) - 3(5)²
h = 100 - 75
h = 25

3) K = 2 × ( p + l )
K = 2 × ( 5x - 3 + x + 2)
K = 2 × ( 6x - 1)
K = 12x - 2

b) x = 15
K = 12(15) - 2
K =180 - 2
K = 178