tolong dibanti no 1dan 2

>> soal no 2 <<

• model matematika
1120000A + 840000B ≤ 22400000
4A + 3B ≤ 80

A + B ≤ 25
A ≥ 0
B ≥ 0

• fungsi obyektif
f(A,B) = 150000A + 120000B

•••
4A + 3B ≤ 80
A(0,80/3)
B(20,0)

A + B ≤ 25
C(0,25)
D(25,0)

titik potong
4A + 3B = 80
A + B = 25
E(5,20)

titik yg memenuhi soal :
B, C, D, dan E

B(20,0) ---> f(20,0) = 3000000
C(0,25) ---> f(0,25) = 3000000
D(25,0) ---> f(25,0) = 3750000
E(5,20) ---> f(5,20) = 3150000

Keuntungan maksimum : 3.750.000
di titik D
25 sepeda jenis A
0 jenis B

>> soal no 1 <<
b.
Un = 4i - 1
n = 8

3, 7, 11, ... , 31

S8 = (n/2)(a + Un)
S8 = 4(3 + 31)
S8 = 136

c.
n = ... (9 10 11)
Un = (k - 5)²
data : 16, 25, 36

jumlah = 16 + 25 + 36 = 77