Arithmetic sequences and series

Which of these is another name for an arithmetic sequence?

• Arithmetic series

• Geometric sequence

• Linear sequence

• Quadratic sequence

Which of these sequences is arithmetic?

• 94, 91, 87, 82, ...

• 2, 4, 8, 16, ...

• 56, 51, 46, 41, ...

• 15, 18, 22, 25, ...

For the sequence 56, 51, 46, 41, the formula for u_n is

• $56-5\left(n-1\right)$

• $51-5n$

• $-5n+51$

• All of the above

 $\sum_{n=3}^62n-1\ =$  

•  $1+3+5+7+9+11$  

•  $1+3+5$  

•  $5+7+9+11$  

•  $7+9+11$  

John receives $5 this week, $7 next week, then $9 etc.
In a year, how much will he receive in total?

•  $5+2\left(52-1\right)$  

•  $5+52\times2$  

•  $\frac{52}{2}\left(2\times5+\left(52-1\right)\times2\right)$  

•  $\frac{52}{2}\left(5+\left(52-1\right)\times2\right)$  

What is the sum of the numbers from 1 to 100? And who supposedly found this out?

• 50050; Gauss

• 5050; Gauss

• 50050; Descartes

• 5050; Descartes