Afla valoarea lu a:7×a=8×10-31
2 answers:
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Step-by-step explanation:
= - 4
= a* + (3- 1) d*
- 4 = a + 2d . . . . . . . . .(i)
= - 29
= a + ( 8 - 1) d
- 29 = a + 7d . . . . . . . . (ii)
subtracting equations (i) and (ii)
25 = 5d
d = -5
placing d = -5 in equation (i)
a - 10 = -4
a = 6
For an arithmetic Progtession
= a + (n - 1)d
= 6 + (n- 1)-5
= 6 - 5n + 5
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Sold Last Month: 60 x = 40
Remaining from last month: 60 - 40 = 20
Sold This Month: 20 x = 8
Remaining from this month: 20 - 8 = 12
Answer: there are 12 houses left to be sold