1.

K = 5-(-2) = 7

L = 8-(-3) = 11

M = 7-3 = 4

N = 7-(-5) = 12 ==> yg mengalami perubahan suhu paling besar

2.

yg senang keduanya = ( 17 + 18 + 2) - 32 = 37-32 = 5

yg hanya senang matematika = 17 - 5 = 12 siswa

3.

p = 2x + 5

l = x + 3

k = 46

k = 2p + 2l

46 = 4x + 10 + 2x + 6

46 = 6x + 16

6x = 46 - 16 = 30

x = 5

maka panjang = 2x + 5 = 10 + 5 = 15

lebar = x + 3 = 5 + 3 = 8

4.

2(4x + 5) - (5x + 7)

8x + 10 - 5x - 7 = 3x + 3

5. soal y g lengkap ya say

6.

harga jual 5juta

untung 25%

harga beli = 100%/(125%) x 5 juta

= 4/5 x 5 juta = 4 juta

7. AOB = 180°

2x + 30° + x = 180°

3x + 30° = 180°

3x = 180 - 30 = 150°

x = 150/3 = 50°

AOD = 2x + 30 = 100 + 30 = 130°

8.

alas segitiga pinggir = (13-7):2 = 3

sisi miring = √4² + 3² = √25 = 5

keliling = 5+13+5+7 = 30m

dipasang pohon = 30:1,5 = 20 pohon