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Un = U5 = 23 cm
Sn = n/2 (a+Un)
S5 = 5/2 (15 + 23)
S5 = 2,5 (38)
S5 = 95 cm
n=5
un=23
un=a+(n-1)b
23=15+(5-1)b
23-15=4b
8=4b
b=2
s5=5/2.(2.15+4.2)
s5=5/2.(30+8)
s5=5×19
s5=95