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Arisa [49]
3 years ago
5

Find the sum of the first 90 terms of the sequence –4, –1, 2, 5, 8, ...

Mathematics
2 answers:
Aleks04 [339]3 years ago
8 0
Hello : 
-1-(-4) =2-(-1)=5-2=8-5=3     ( arhtmitic sequence   r= 3)
Un = U1+(n-1)r
U90 = -4+(90-1)(3)= 263
sum = n/2 (U1 +U90)
sum = 90/2(-4+263) = 11655
Juli2301 [7.4K]3 years ago
6 0

Answer:

11655 is correct

Step-by-step explanation:

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Makovka662 [10]

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4 years ago
If the coefficient of determination for a data set is 0.75 and the SSE for the data set is 13, what is the SST for the data set?
nadya68 [22]
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4 years ago
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Find three consicutive numbers that have the sum 96
In-s [12.5K]

Answer:

31, 32, 33

Step-by-step explanation:

three consicutive numbers means 3 numbers in a row

sum 96 is the total you want to reach

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Answer:

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Step-by-step explanation:

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