tolong jawab no 14 dan 15 kak

K = 2p + 2l.
68 = 2(x + 6) + 2(x).
68 = 2x + 12 + 2x.
68 = 4x + 12.

4x = 68 - 12.
4x = 56.
x = 56/4.
x = 14.

L. Persegi panjang
= p × l.
= (x + 6) × x.
= (14 + 6) × 14.
= 20 × 14.
= 280cm⁲.

15. (6xy-3xy)+(7xz-4xz)+(-5yz-2yz)
= C 3xy+3xz-7yz