flakko1899
09.12.2020 •
Mathematics
A series is defined by 5+9+13+17++805 a. Find the number of terms of the series. b. Find the sum of the first 20 terms.
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Ответ:
the number of terms of the series is 201 numbers
the sum of the first 20 terms is 890
the number of terms of the series is
the series have:
u1 = 5
d = 4
=> u(n) = 5 + 4.(n - 1)
=> u(20) = 5 + 19.4 = 81
so the sum of the first 20 terms is (81 + 5).20/2 = 890
( u1 is the first number of the series, d is the distance between front and rear numbers, u(n) is the overall term of the sequence, u(20) is the 20th of the series)
Step-by-step explanation:
Ответ:
this is what i know
For a party, you can spend no more than $ 20 on cakes. The egg cake cost is $ 4 and the cream cake cost is $ 2. Write the linear inequality that models the situation. Graph the inequality. Suppose that the number of egg cakes we buy is represented by x and the number of cream cakes we buy is represented by y.